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1 // Backbone.js 1.4.0 2 3 // (c) 2010-2019 Jeremy Ashkenas and DocumentCloud 4 // Backbone may be freely distributed under the MIT license. 5 // For all details and documentation: 6 // http://backbonejs.org 7 8 (function(factory) { 9 10 // Establish the root object, `window` (`self`) in the browser, or `global` on the server. 11 // We use `self` instead of `window` for `WebWorker` support. 12 var root = typeof self == 'object' && self.self === self && self || 13 typeof global == 'object' && global.global === global && global; 14 15 // Set up Backbone appropriately for the environment. Start with AMD. 16 if (typeof define === 'function' && define.amd) { 17 define(['underscore', 'jquery', 'exports'], function(_, $, exports) { 18 // Export global even in AMD case in case this script is loaded with 19 // others that may still expect a global Backbone. 20 root.Backbone = factory(root, exports, _, $); 21 }); 22 23 // Next for Node.js or CommonJS. jQuery may not be needed as a module. 24 } else if (typeof exports !== 'undefined') { 25 var _ = require('underscore'), $; 26 try { $ = require('jquery'); } catch (e) {} 27 factory(root, exports, _, $); 28 29 // Finally, as a browser global. 30 } else { 31 root.Backbone = factory(root, {}, root._, root.jQuery || root.Zepto || root.ender || root.$); 32 } 33 34 })(function(root, Backbone, _, $) { 35 36 // Initial Setup 37 // ------------- 38 39 // Save the previous value of the `Backbone` variable, so that it can be 40 // restored later on, if `noConflict` is used. 41 var previousBackbone = root.Backbone; 42 43 // Create a local reference to a common array method we'll want to use later. 44 var slice = Array.prototype.slice; 45 46 // Current version of the library. Keep in sync with `package.json`. 47 Backbone.VERSION = '1.4.0'; 48 49 // For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns 50 // the `$` variable. 51 Backbone.$ = $; 52 53 // Runs Backbone.js in *noConflict* mode, returning the `Backbone` variable 54 // to its previous owner. Returns a reference to this Backbone object. 55 Backbone.noConflict = function() { 56 root.Backbone = previousBackbone; 57 return this; 58 }; 59 60 // Turn on `emulateHTTP` to support legacy HTTP servers. Setting this option 61 // will fake `"PATCH"`, `"PUT"` and `"DELETE"` requests via the `_method` parameter and 62 // set a `X-Http-Method-Override` header. 63 Backbone.emulateHTTP = false; 64 65 // Turn on `emulateJSON` to support legacy servers that can't deal with direct 66 // `application/json` requests ... this will encode the body as 67 // `application/x-www-form-urlencoded` instead and will send the model in a 68 // form param named `model`. 69 Backbone.emulateJSON = false; 70 71 // Backbone.Events 72 // --------------- 73 74 // A module that can be mixed in to *any object* in order to provide it with 75 // a custom event channel. You may bind a callback to an event with `on` or 76 // remove with `off`; `trigger`-ing an event fires all callbacks in 77 // succession. 78 // 79 // var object = {}; 80 // _.extend(object, Backbone.Events); 81 // object.on('expand', function(){ alert('expanded'); }); 82 // object.trigger('expand'); 83 // 84 var Events = Backbone.Events = {}; 85 86 // Regular expression used to split event strings. 87 var eventSplitter = /\s+/; 88 89 // A private global variable to share between listeners and listenees. 90 var _listening; 91 92 // Iterates over the standard `event, callback` (as well as the fancy multiple 93 // space-separated events `"change blur", callback` and jQuery-style event 94 // maps `{event: callback}`). 95 var eventsApi = function(iteratee, events, name, callback, opts) { 96 var i = 0, names; 97 if (name && typeof name === 'object') { 98 // Handle event maps. 99 if (callback !== void 0 && 'context' in opts && opts.context === void 0) opts.context = callback; 100 for (names = _.keys(name); i < names.length ; i++) { 101 events = eventsApi(iteratee, events, names[i], name[names[i]], opts); 102 } 103 } else if (name && eventSplitter.test(name)) { 104 // Handle space-separated event names by delegating them individually. 105 for (names = name.split(eventSplitter); i < names.length; i++) { 106 events = iteratee(events, names[i], callback, opts); 107 } 108 } else { 109 // Finally, standard events. 110 events = iteratee(events, name, callback, opts); 111 } 112 return events; 113 }; 114 115 // Bind an event to a `callback` function. Passing `"all"` will bind 116 // the callback to all events fired. 117 Events.on = function(name, callback, context) { 118 this._events = eventsApi(onApi, this._events || {}, name, callback, { 119 context: context, 120 ctx: this, 121 listening: _listening 122 }); 123 124 if (_listening) { 125 var listeners = this._listeners || (this._listeners = {}); 126 listeners[_listening.id] = _listening; 127 // Allow the listening to use a counter, instead of tracking 128 // callbacks for library interop 129 _listening.interop = false; 130 } 131 132 return this; 133 }; 134 135 // Inversion-of-control versions of `on`. Tell *this* object to listen to 136 // an event in another object... keeping track of what it's listening to 137 // for easier unbinding later. 138 Events.listenTo = function(obj, name, callback) { 139 if (!obj) return this; 140 var id = obj._listenId || (obj._listenId = _.uniqueId('l')); 141 var listeningTo = this._listeningTo || (this._listeningTo = {}); 142 var listening = _listening = listeningTo[id]; 143 144 // This object is not listening to any other events on `obj` yet. 145 // Setup the necessary references to track the listening callbacks. 146 if (!listening) { 147 this._listenId || (this._listenId = _.uniqueId('l')); 148 listening = _listening = listeningTo[id] = new Listening(this, obj); 149 } 150 151 // Bind callbacks on obj. 152 var error = tryCatchOn(obj, name, callback, this); 153 _listening = void 0; 154 155 if (error) throw error; 156 // If the target obj is not Backbone.Events, track events manually. 157 if (listening.interop) listening.on(name, callback); 158 159 return this; 160 }; 161 162 // The reducing API that adds a callback to the `events` object. 163 var onApi = function(events, name, callback, options) { 164 if (callback) { 165 var handlers = events[name] || (events[name] = []); 166 var context = options.context, ctx = options.ctx, listening = options.listening; 167 if (listening) listening.count++; 168 169 handlers.push({callback: callback, context: context, ctx: context || ctx, listening: listening}); 170 } 171 return events; 172 }; 173 174 // An try-catch guarded #on function, to prevent poisoning the global 175 // `_listening` variable. 176 var tryCatchOn = function(obj, name, callback, context) { 177 try { 178 obj.on(name, callback, context); 179 } catch (e) { 180 return e; 181 } 182 }; 183 184 // Remove one or many callbacks. If `context` is null, removes all 185 // callbacks with that function. If `callback` is null, removes all 186 // callbacks for the event. If `name` is null, removes all bound 187 // callbacks for all events. 188 Events.off = function(name, callback, context) { 189 if (!this._events) return this; 190 this._events = eventsApi(offApi, this._events, name, callback, { 191 context: context, 192 listeners: this._listeners 193 }); 194 195 return this; 196 }; 197 198 // Tell this object to stop listening to either specific events ... or 199 // to every object it's currently listening to. 200 Events.stopListening = function(obj, name, callback) { 201 var listeningTo = this._listeningTo; 202 if (!listeningTo) return this; 203 204 var ids = obj ? [obj._listenId] : _.keys(listeningTo); 205 for (var i = 0; i < ids.length; i++) { 206 var listening = listeningTo[ids[i]]; 207 208 // If listening doesn't exist, this object is not currently 209 // listening to obj. Break out early. 210 if (!listening) break; 211 212 listening.obj.off(name, callback, this); 213 if (listening.interop) listening.off(name, callback); 214 } 215 if (_.isEmpty(listeningTo)) this._listeningTo = void 0; 216 217 return this; 218 }; 219 220 // The reducing API that removes a callback from the `events` object. 221 var offApi = function(events, name, callback, options) { 222 if (!events) return; 223 224 var context = options.context, listeners = options.listeners; 225 var i = 0, names; 226 227 // Delete all event listeners and "drop" events. 228 if (!name && !context && !callback) { 229 for (names = _.keys(listeners); i < names.length; i++) { 230 listeners[names[i]].cleanup(); 231 } 232 return; 233 } 234 235 names = name ? [name] : _.keys(events); 236 for (; i < names.length; i++) { 237 name = names[i]; 238 var handlers = events[name]; 239 240 // Bail out if there are no events stored. 241 if (!handlers) break; 242 243 // Find any remaining events. 244 var remaining = []; 245 for (var j = 0; j < handlers.length; j++) { 246 var handler = handlers[j]; 247 if ( 248 callback && callback !== handler.callback && 249 callback !== handler.callback._callback || 250 context && context !== handler.context 251 ) { 252 remaining.push(handler); 253 } else { 254 var listening = handler.listening; 255 if (listening) listening.off(name, callback); 256 } 257 } 258 259 // Replace events if there are any remaining. Otherwise, clean up. 260 if (remaining.length) { 261 events[name] = remaining; 262 } else { 263 delete events[name]; 264 } 265 } 266 267 return events; 268 }; 269 270 // Bind an event to only be triggered a single time. After the first time 271 // the callback is invoked, its listener will be removed. If multiple events 272 // are passed in using the space-separated syntax, the handler will fire 273 // once for each event, not once for a combination of all events. 274 Events.once = function(name, callback, context) { 275 // Map the event into a `{event: once}` object. 276 var events = eventsApi(onceMap, {}, name, callback, this.off.bind(this)); 277 if (typeof name === 'string' && context == null) callback = void 0; 278 return this.on(events, callback, context); 279 }; 280 281 // Inversion-of-control versions of `once`. 282 Events.listenToOnce = function(obj, name, callback) { 283 // Map the event into a `{event: once}` object. 284 var events = eventsApi(onceMap, {}, name, callback, this.stopListening.bind(this, obj)); 285 return this.listenTo(obj, events); 286 }; 287 288 // Reduces the event callbacks into a map of `{event: onceWrapper}`. 289 // `offer` unbinds the `onceWrapper` after it has been called. 290 var onceMap = function(map, name, callback, offer) { 291 if (callback) { 292 var once = map[name] = _.once(function() { 293 offer(name, once); 294 callback.apply(this, arguments); 295 }); 296 once._callback = callback; 297 } 298 return map; 299 }; 300 301 // Trigger one or many events, firing all bound callbacks. Callbacks are 302 // passed the same arguments as `trigger` is, apart from the event name 303 // (unless you're listening on `"all"`, which will cause your callback to 304 // receive the true name of the event as the first argument). 305 Events.trigger = function(name) { 306 if (!this._events) return this; 307 308 var length = Math.max(0, arguments.length - 1); 309 var args = Array(length); 310 for (var i = 0; i < length; i++) args[i] = arguments[i + 1]; 311 312 eventsApi(triggerApi, this._events, name, void 0, args); 313 return this; 314 }; 315 316 // Handles triggering the appropriate event callbacks. 317 var triggerApi = function(objEvents, name, callback, args) { 318 if (objEvents) { 319 var events = objEvents[name]; 320 var allEvents = objEvents.all; 321 if (events && allEvents) allEvents = allEvents.slice(); 322 if (events) triggerEvents(events, args); 323 if (allEvents) triggerEvents(allEvents, [name].concat(args)); 324 } 325 return objEvents; 326 }; 327 328 // A difficult-to-believe, but optimized internal dispatch function for 329 // triggering events. Tries to keep the usual cases speedy (most internal 330 // Backbone events have 3 arguments). 331 var triggerEvents = function(events, args) { 332 var ev, i = -1, l = events.length, a1 = args[0], a2 = args[1], a3 = args[2]; 333 switch (args.length) { 334 case 0: while (++i < l) (ev = events[i]).callback.call(ev.ctx); return; 335 case 1: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1); return; 336 case 2: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2); return; 337 case 3: while (++i < l) (ev = events[i]).callback.call(ev.ctx, a1, a2, a3); return; 338 default: while (++i < l) (ev = events[i]).callback.apply(ev.ctx, args); return; 339 } 340 }; 341 342 // A listening class that tracks and cleans up memory bindings 343 // when all callbacks have been offed. 344 var Listening = function(listener, obj) { 345 this.id = listener._listenId; 346 this.listener = listener; 347 this.obj = obj; 348 this.interop = true; 349 this.count = 0; 350 this._events = void 0; 351 }; 352 353 Listening.prototype.on = Events.on; 354 355 // Offs a callback (or several). 356 // Uses an optimized counter if the listenee uses Backbone.Events. 357 // Otherwise, falls back to manual tracking to support events 358 // library interop. 359 Listening.prototype.off = function(name, callback) { 360 var cleanup; 361 if (this.interop) { 362 this._events = eventsApi(offApi, this._events, name, callback, { 363 context: void 0, 364 listeners: void 0 365 }); 366 cleanup = !this._events; 367 } else { 368 this.count--; 369 cleanup = this.count === 0; 370 } 371 if (cleanup) this.cleanup(); 372 }; 373 374 // Cleans up memory bindings between the listener and the listenee. 375 Listening.prototype.cleanup = function() { 376 delete this.listener._listeningTo[this.obj._listenId]; 377 if (!this.interop) delete this.obj._listeners[this.id]; 378 }; 379 380 // Aliases for backwards compatibility. 381 Events.bind = Events.on; 382 Events.unbind = Events.off; 383 384 // Allow the `Backbone` object to serve as a global event bus, for folks who 385 // want global "pubsub" in a convenient place. 386 _.extend(Backbone, Events); 387 388 // Backbone.Model 389 // -------------- 390 391 // Backbone **Models** are the basic data object in the framework -- 392 // frequently representing a row in a table in a database on your server. 393 // A discrete chunk of data and a bunch of useful, related methods for 394 // performing computations and transformations on that data. 395 396 // Create a new model with the specified attributes. A client id (`cid`) 397 // is automatically generated and assigned for you. 398 var Model = Backbone.Model = function(attributes, options) { 399 var attrs = attributes || {}; 400 options || (options = {}); 401 this.preinitialize.apply(this, arguments); 402 this.cid = _.uniqueId(this.cidPrefix); 403 this.attributes = {}; 404 if (options.collection) this.collection = options.collection; 405 if (options.parse) attrs = this.parse(attrs, options) || {}; 406 var defaults = _.result(this, 'defaults'); 407 attrs = _.defaults(_.extend({}, defaults, attrs), defaults); 408 this.set(attrs, options); 409 this.changed = {}; 410 this.initialize.apply(this, arguments); 411 }; 412 413 // Attach all inheritable methods to the Model prototype. 414 _.extend(Model.prototype, Events, { 415 416 // A hash of attributes whose current and previous value differ. 417 changed: null, 418 419 // The value returned during the last failed validation. 420 validationError: null, 421 422 // The default name for the JSON `id` attribute is `"id"`. MongoDB and 423 // CouchDB users may want to set this to `"_id"`. 424 idAttribute: 'id', 425 426 // The prefix is used to create the client id which is used to identify models locally. 427 // You may want to override this if you're experiencing name clashes with model ids. 428 cidPrefix: 'c', 429 430 // preinitialize is an empty function by default. You can override it with a function 431 // or object. preinitialize will run before any instantiation logic is run in the Model. 432 preinitialize: function(){}, 433 434 // Initialize is an empty function by default. Override it with your own 435 // initialization logic. 436 initialize: function(){}, 437 438 // Return a copy of the model's `attributes` object. 439 toJSON: function(options) { 440 return _.clone(this.attributes); 441 }, 442 443 // Proxy `Backbone.sync` by default -- but override this if you need 444 // custom syncing semantics for *this* particular model. 445 sync: function() { 446 return Backbone.sync.apply(this, arguments); 447 }, 448 449 // Get the value of an attribute. 450 get: function(attr) { 451 return this.attributes[attr]; 452 }, 453 454 // Get the HTML-escaped value of an attribute. 455 escape: function(attr) { 456 return _.escape(this.get(attr)); 457 }, 458 459 // Returns `true` if the attribute contains a value that is not null 460 // or undefined. 461 has: function(attr) { 462 return this.get(attr) != null; 463 }, 464 465 // Special-cased proxy to underscore's `_.matches` method. 466 matches: function(attrs) { 467 return !!_.iteratee(attrs, this)(this.attributes); 468 }, 469 470 // Set a hash of model attributes on the object, firing `"change"`. This is 471 // the core primitive operation of a model, updating the data and notifying 472 // anyone who needs to know about the change in state. The heart of the beast. 473 set: function(key, val, options) { 474 if (key == null) return this; 475 476 // Handle both `"key", value` and `{key: value}` -style arguments. 477 var attrs; 478 if (typeof key === 'object') { 479 attrs = key; 480 options = val; 481 } else { 482 (attrs = {})[key] = val; 483 } 484 485 options || (options = {}); 486 487 // Run validation. 488 if (!this._validate(attrs, options)) return false; 489 490 // Extract attributes and options. 491 var unset = options.unset; 492 var silent = options.silent; 493 var changes = []; 494 var changing = this._changing; 495 this._changing = true; 496 497 if (!changing) { 498 this._previousAttributes = _.clone(this.attributes); 499 this.changed = {}; 500 } 501 502 var current = this.attributes; 503 var changed = this.changed; 504 var prev = this._previousAttributes; 505 506 // For each `set` attribute, update or delete the current value. 507 for (var attr in attrs) { 508 val = attrs[attr]; 509 if (!_.isEqual(current[attr], val)) changes.push(attr); 510 if (!_.isEqual(prev[attr], val)) { 511 changed[attr] = val; 512 } else { 513 delete changed[attr]; 514 } 515 unset ? delete current[attr] : current[attr] = val; 516 } 517 518 // Update the `id`. 519 if (this.idAttribute in attrs) this.id = this.get(this.idAttribute); 520 521 // Trigger all relevant attribute changes. 522 if (!silent) { 523 if (changes.length) this._pending = options; 524 for (var i = 0; i < changes.length; i++) { 525 this.trigger('change:' + changes[i], this, current[changes[i]], options); 526 } 527 } 528 529 // You might be wondering why there's a `while` loop here. Changes can 530 // be recursively nested within `"change"` events. 531 if (changing) return this; 532 if (!silent) { 533 while (this._pending) { 534 options = this._pending; 535 this._pending = false; 536 this.trigger('change', this, options); 537 } 538 } 539 this._pending = false; 540 this._changing = false; 541 return this; 542 }, 543 544 // Remove an attribute from the model, firing `"change"`. `unset` is a noop 545 // if the attribute doesn't exist. 546 unset: function(attr, options) { 547 return this.set(attr, void 0, _.extend({}, options, {unset: true})); 548 }, 549 550 // Clear all attributes on the model, firing `"change"`. 551 clear: function(options) { 552 var attrs = {}; 553 for (var key in this.attributes) attrs[key] = void 0; 554 return this.set(attrs, _.extend({}, options, {unset: true})); 555 }, 556 557 // Determine if the model has changed since the last `"change"` event. 558 // If you specify an attribute name, determine if that attribute has changed. 559 hasChanged: function(attr) { 560 if (attr == null) return !_.isEmpty(this.changed); 561 return _.has(this.changed, attr); 562 }, 563 564 // Return an object containing all the attributes that have changed, or 565 // false if there are no changed attributes. Useful for determining what 566 // parts of a view need to be updated and/or what attributes need to be 567 // persisted to the server. Unset attributes will be set to undefined. 568 // You can also pass an attributes object to diff against the model, 569 // determining if there *would be* a change. 570 changedAttributes: function(diff) { 571 if (!diff) return this.hasChanged() ? _.clone(this.changed) : false; 572 var old = this._changing ? this._previousAttributes : this.attributes; 573 var changed = {}; 574 var hasChanged; 575 for (var attr in diff) { 576 var val = diff[attr]; 577 if (_.isEqual(old[attr], val)) continue; 578 changed[attr] = val; 579 hasChanged = true; 580 } 581 return hasChanged ? changed : false; 582 }, 583 584 // Get the previous value of an attribute, recorded at the time the last 585 // `"change"` event was fired. 586 previous: function(attr) { 587 if (attr == null || !this._previousAttributes) return null; 588 return this._previousAttributes[attr]; 589 }, 590 591 // Get all of the attributes of the model at the time of the previous 592 // `"change"` event. 593 previousAttributes: function() { 594 return _.clone(this._previousAttributes); 595 }, 596 597 // Fetch the model from the server, merging the response with the model's 598 // local attributes. Any changed attributes will trigger a "change" event. 599 fetch: function(options) { 600 options = _.extend({parse: true}, options); 601 var model = this; 602 var success = options.success; 603 options.success = function(resp) { 604 var serverAttrs = options.parse ? model.parse(resp, options) : resp; 605 if (!model.set(serverAttrs, options)) return false; 606 if (success) success.call(options.context, model, resp, options); 607 model.trigger('sync', model, resp, options); 608 }; 609 wrapError(this, options); 610 return this.sync('read', this, options); 611 }, 612 613 // Set a hash of model attributes, and sync the model to the server. 614 // If the server returns an attributes hash that differs, the model's 615 // state will be `set` again. 616 save: function(key, val, options) { 617 // Handle both `"key", value` and `{key: value}` -style arguments. 618 var attrs; 619 if (key == null || typeof key === 'object') { 620 attrs = key; 621 options = val; 622 } else { 623 (attrs = {})[key] = val; 624 } 625 626 options = _.extend({validate: true, parse: true}, options); 627 var wait = options.wait; 628 629 // If we're not waiting and attributes exist, save acts as 630 // `set(attr).save(null, opts)` with validation. Otherwise, check if 631 // the model will be valid when the attributes, if any, are set. 632 if (attrs && !wait) { 633 if (!this.set(attrs, options)) return false; 634 } else if (!this._validate(attrs, options)) { 635 return false; 636 } 637 638 // After a successful server-side save, the client is (optionally) 639 // updated with the server-side state. 640 var model = this; 641 var success = options.success; 642 var attributes = this.attributes; 643 options.success = function(resp) { 644 // Ensure attributes are restored during synchronous saves. 645 model.attributes = attributes; 646 var serverAttrs = options.parse ? model.parse(resp, options) : resp; 647 if (wait) serverAttrs = _.extend({}, attrs, serverAttrs); 648 if (serverAttrs && !model.set(serverAttrs, options)) return false; 649 if (success) success.call(options.context, model, resp, options); 650 model.trigger('sync', model, resp, options); 651 }; 652 wrapError(this, options); 653 654 // Set temporary attributes if `{wait: true}` to properly find new ids. 655 if (attrs && wait) this.attributes = _.extend({}, attributes, attrs); 656 657 var method = this.isNew() ? 'create' : options.patch ? 'patch' : 'update'; 658 if (method === 'patch' && !options.attrs) options.attrs = attrs; 659 var xhr = this.sync(method, this, options); 660 661 // Restore attributes. 662 this.attributes = attributes; 663 664 return xhr; 665 }, 666 667 // Destroy this model on the server if it was already persisted. 668 // Optimistically removes the model from its collection, if it has one. 669 // If `wait: true` is passed, waits for the server to respond before removal. 670 destroy: function(options) { 671 options = options ? _.clone(options) : {}; 672 var model = this; 673 var success = options.success; 674 var wait = options.wait; 675 676 var destroy = function() { 677 model.stopListening(); 678 model.trigger('destroy', model, model.collection, options); 679 }; 680 681 options.success = function(resp) { 682 if (wait) destroy(); 683 if (success) success.call(options.context, model, resp, options); 684 if (!model.isNew()) model.trigger('sync', model, resp, options); 685 }; 686 687 var xhr = false; 688 if (this.isNew()) { 689 _.defer(options.success); 690 } else { 691 wrapError(this, options); 692 xhr = this.sync('delete', this, options); 693 } 694 if (!wait) destroy(); 695 return xhr; 696 }, 697 698 // Default URL for the model's representation on the server -- if you're 699 // using Backbone's restful methods, override this to change the endpoint 700 // that will be called. 701 url: function() { 702 var base = 703 _.result(this, 'urlRoot') || 704 _.result(this.collection, 'url') || 705 urlError(); 706 if (this.isNew()) return base; 707 var id = this.get(this.idAttribute); 708 return base.replace(/[^\/]$/, '$&/') + encodeURIComponent(id); 709 }, 710 711 // **parse** converts a response into the hash of attributes to be `set` on 712 // the model. The default implementation is just to pass the response along. 713 parse: function(resp, options) { 714 return resp; 715 }, 716 717 // Create a new model with identical attributes to this one. 718 clone: function() { 719 return new this.constructor(this.attributes); 720 }, 721 722 // A model is new if it has never been saved to the server, and lacks an id. 723 isNew: function() { 724 return !this.has(this.idAttribute); 725 }, 726 727 // Check if the model is currently in a valid state. 728 isValid: function(options) { 729 return this._validate({}, _.extend({}, options, {validate: true})); 730 }, 731 732 // Run validation against the next complete set of model attributes, 733 // returning `true` if all is well. Otherwise, fire an `"invalid"` event. 734 _validate: function(attrs, options) { 735 if (!options.validate || !this.validate) return true; 736 attrs = _.extend({}, this.attributes, attrs); 737 var error = this.validationError = this.validate(attrs, options) || null; 738 if (!error) return true; 739 this.trigger('invalid', this, error, _.extend(options, {validationError: error})); 740 return false; 741 } 742 743 }); 744 745 // Backbone.Collection 746 // ------------------- 747 748 // If models tend to represent a single row of data, a Backbone Collection is 749 // more analogous to a table full of data ... or a small slice or page of that 750 // table, or a collection of rows that belong together for a particular reason 751 // -- all of the messages in this particular folder, all of the documents 752 // belonging to this particular author, and so on. Collections maintain 753 // indexes of their models, both in order, and for lookup by `id`. 754 755 // Create a new **Collection**, perhaps to contain a specific type of `model`. 756 // If a `comparator` is specified, the Collection will maintain 757 // its models in sort order, as they're added and removed. 758 var Collection = Backbone.Collection = function(models, options) { 759 options || (options = {}); 760 this.preinitialize.apply(this, arguments); 761 if (options.model) this.model = options.model; 762 if (options.comparator !== void 0) this.comparator = options.comparator; 763 this._reset(); 764 this.initialize.apply(this, arguments); 765 if (models) this.reset(models, _.extend({silent: true}, options)); 766 }; 767 768 // Default options for `Collection#set`. 769 var setOptions = {add: true, remove: true, merge: true}; 770 var addOptions = {add: true, remove: false}; 771 772 // Splices `insert` into `array` at index `at`. 773 var splice = function(array, insert, at) { 774 at = Math.min(Math.max(at, 0), array.length); 775 var tail = Array(array.length - at); 776 var length = insert.length; 777 var i; 778 for (i = 0; i < tail.length; i++) tail[i] = array[i + at]; 779 for (i = 0; i < length; i++) array[i + at] = insert[i]; 780 for (i = 0; i < tail.length; i++) array[i + length + at] = tail[i]; 781 }; 782 783 // Define the Collection's inheritable methods. 784 _.extend(Collection.prototype, Events, { 785 786 // The default model for a collection is just a **Backbone.Model**. 787 // This should be overridden in most cases. 788 model: Model, 789 790 791 // preinitialize is an empty function by default. You can override it with a function 792 // or object. preinitialize will run before any instantiation logic is run in the Collection. 793 preinitialize: function(){}, 794 795 // Initialize is an empty function by default. Override it with your own 796 // initialization logic. 797 initialize: function(){}, 798 799 // The JSON representation of a Collection is an array of the 800 // models' attributes. 801 toJSON: function(options) { 802 return this.map(function(model) { return model.toJSON(options); }); 803 }, 804 805 // Proxy `Backbone.sync` by default. 806 sync: function() { 807 return Backbone.sync.apply(this, arguments); 808 }, 809 810 // Add a model, or list of models to the set. `models` may be Backbone 811 // Models or raw JavaScript objects to be converted to Models, or any 812 // combination of the two. 813 add: function(models, options) { 814 return this.set(models, _.extend({merge: false}, options, addOptions)); 815 }, 816 817 // Remove a model, or a list of models from the set. 818 remove: function(models, options) { 819 options = _.extend({}, options); 820 var singular = !_.isArray(models); 821 models = singular ? [models] : models.slice(); 822 var removed = this._removeModels(models, options); 823 if (!options.silent && removed.length) { 824 options.changes = {added: [], merged: [], removed: removed}; 825 this.trigger('update', this, options); 826 } 827 return singular ? removed[0] : removed; 828 }, 829 830 // Update a collection by `set`-ing a new list of models, adding new ones, 831 // removing models that are no longer present, and merging models that 832 // already exist in the collection, as necessary. Similar to **Model#set**, 833 // the core operation for updating the data contained by the collection. 834 set: function(models, options) { 835 if (models == null) return; 836 837 options = _.extend({}, setOptions, options); 838 if (options.parse && !this._isModel(models)) { 839 models = this.parse(models, options) || []; 840 } 841 842 var singular = !_.isArray(models); 843 models = singular ? [models] : models.slice(); 844 845 var at = options.at; 846 if (at != null) at = +at; 847 if (at > this.length) at = this.length; 848 if (at < 0) at += this.length + 1; 849 850 var set = []; 851 var toAdd = []; 852 var toMerge = []; 853 var toRemove = []; 854 var modelMap = {}; 855 856 var add = options.add; 857 var merge = options.merge; 858 var remove = options.remove; 859 860 var sort = false; 861 var sortable = this.comparator && at == null && options.sort !== false; 862 var sortAttr = _.isString(this.comparator) ? this.comparator : null; 863 864 // Turn bare objects into model references, and prevent invalid models 865 // from being added. 866 var model, i; 867 for (i = 0; i < models.length; i++) { 868 model = models[i]; 869 870 // If a duplicate is found, prevent it from being added and 871 // optionally merge it into the existing model. 872 var existing = this.get(model); 873 if (existing) { 874 if (merge && model !== existing) { 875 var attrs = this._isModel(model) ? model.attributes : model; 876 if (options.parse) attrs = existing.parse(attrs, options); 877 existing.set(attrs, options); 878 toMerge.push(existing); 879 if (sortable && !sort) sort = existing.hasChanged(sortAttr); 880 } 881 if (!modelMap[existing.cid]) { 882 modelMap[existing.cid] = true; 883 set.push(existing); 884 } 885 models[i] = existing; 886 887 // If this is a new, valid model, push it to the `toAdd` list. 888 } else if (add) { 889 model = models[i] = this._prepareModel(model, options); 890 if (model) { 891 toAdd.push(model); 892 this._addReference(model, options); 893 modelMap[model.cid] = true; 894 set.push(model); 895 } 896 } 897 } 898 899 // Remove stale models. 900 if (remove) { 901 for (i = 0; i < this.length; i++) { 902 model = this.models[i]; 903 if (!modelMap[model.cid]) toRemove.push(model); 904 } 905 if (toRemove.length) this._removeModels(toRemove, options); 906 } 907 908 // See if sorting is needed, update `length` and splice in new models. 909 var orderChanged = false; 910 var replace = !sortable && add && remove; 911 if (set.length && replace) { 912 orderChanged = this.length !== set.length || _.some(this.models, function(m, index) { 913 return m !== set[index]; 914 }); 915 this.models.length = 0; 916 splice(this.models, set, 0); 917 this.length = this.models.length; 918 } else if (toAdd.length) { 919 if (sortable) sort = true; 920 splice(this.models, toAdd, at == null ? this.length : at); 921 this.length = this.models.length; 922 } 923 924 // Silently sort the collection if appropriate. 925 if (sort) this.sort({silent: true}); 926 927 // Unless silenced, it's time to fire all appropriate add/sort/update events. 928 if (!options.silent) { 929 for (i = 0; i < toAdd.length; i++) { 930 if (at != null) options.index = at + i; 931 model = toAdd[i]; 932 model.trigger('add', model, this, options); 933 } 934 if (sort || orderChanged) this.trigger('sort', this, options); 935 if (toAdd.length || toRemove.length || toMerge.length) { 936 options.changes = { 937 added: toAdd, 938 removed: toRemove, 939 merged: toMerge 940 }; 941 this.trigger('update', this, options); 942 } 943 } 944 945 // Return the added (or merged) model (or models). 946 return singular ? models[0] : models; 947 }, 948 949 // When you have more items than you want to add or remove individually, 950 // you can reset the entire set with a new list of models, without firing 951 // any granular `add` or `remove` events. Fires `reset` when finished. 952 // Useful for bulk operations and optimizations. 953 reset: function(models, options) { 954 options = options ? _.clone(options) : {}; 955 for (var i = 0; i < this.models.length; i++) { 956 this._removeReference(this.models[i], options); 957 } 958 options.previousModels = this.models; 959 this._reset(); 960 models = this.add(models, _.extend({silent: true}, options)); 961 if (!options.silent) this.trigger('reset', this, options); 962 return models; 963 }, 964 965 // Add a model to the end of the collection. 966 push: function(model, options) { 967 return this.add(model, _.extend({at: this.length}, options)); 968 }, 969 970 // Remove a model from the end of the collection. 971 pop: function(options) { 972 var model = this.at(this.length - 1); 973 return this.remove(model, options); 974 }, 975 976 // Add a model to the beginning of the collection. 977 unshift: function(model, options) { 978 return this.add(model, _.extend({at: 0}, options)); 979 }, 980 981 // Remove a model from the beginning of the collection. 982 shift: function(options) { 983 var model = this.at(0); 984 return this.remove(model, options); 985 }, 986 987 // Slice out a sub-array of models from the collection. 988 slice: function() { 989 return slice.apply(this.models, arguments); 990 }, 991 992 // Get a model from the set by id, cid, model object with id or cid 993 // properties, or an attributes object that is transformed through modelId. 994 get: function(obj) { 995 if (obj == null) return void 0; 996 return this._byId[obj] || 997 this._byId[this.modelId(this._isModel(obj) ? obj.attributes : obj)] || 998 obj.cid && this._byId[obj.cid]; 999 }, 1000 1001 // Returns `true` if the model is in the collection. 1002 has: function(obj) { 1003 return this.get(obj) != null; 1004 }, 1005 1006 // Get the model at the given index. 1007 at: function(index) { 1008 if (index < 0) index += this.length; 1009 return this.models[index]; 1010 }, 1011 1012 // Return models with matching attributes. Useful for simple cases of 1013 // `filter`. 1014 where: function(attrs, first) { 1015 return this[first ? 'find' : 'filter'](attrs); 1016 }, 1017 1018 // Return the first model with matching attributes. Useful for simple cases 1019 // of `find`. 1020 findWhere: function(attrs) { 1021 return this.where(attrs, true); 1022 }, 1023 1024 // Force the collection to re-sort itself. You don't need to call this under 1025 // normal circumstances, as the set will maintain sort order as each item 1026 // is added. 1027 sort: function(options) { 1028 var comparator = this.comparator; 1029 if (!comparator) throw new Error('Cannot sort a set without a comparator'); 1030 options || (options = {}); 1031 1032 var length = comparator.length; 1033 if (_.isFunction(comparator)) comparator = comparator.bind(this); 1034 1035 // Run sort based on type of `comparator`. 1036 if (length === 1 || _.isString(comparator)) { 1037 this.models = this.sortBy(comparator); 1038 } else { 1039 this.models.sort(comparator); 1040 } 1041 if (!options.silent) this.trigger('sort', this, options); 1042 return this; 1043 }, 1044 1045 // Pluck an attribute from each model in the collection. 1046 pluck: function(attr) { 1047 return this.map(attr + ''); 1048 }, 1049 1050 // Fetch the default set of models for this collection, resetting the 1051 // collection when they arrive. If `reset: true` is passed, the response 1052 // data will be passed through the `reset` method instead of `set`. 1053 fetch: function(options) { 1054 options = _.extend({parse: true}, options); 1055 var success = options.success; 1056 var collection = this; 1057 options.success = function(resp) { 1058 var method = options.reset ? 'reset' : 'set'; 1059 collection[method](resp, options); 1060 if (success) success.call(options.context, collection, resp, options); 1061 collection.trigger('sync', collection, resp, options); 1062 }; 1063 wrapError(this, options); 1064 return this.sync('read', this, options); 1065 }, 1066 1067 // Create a new instance of a model in this collection. Add the model to the 1068 // collection immediately, unless `wait: true` is passed, in which case we 1069 // wait for the server to agree. 1070 create: function(model, options) { 1071 options = options ? _.clone(options) : {}; 1072 var wait = options.wait; 1073 model = this._prepareModel(model, options); 1074 if (!model) return false; 1075 if (!wait) this.add(model, options); 1076 var collection = this; 1077 var success = options.success; 1078 options.success = function(m, resp, callbackOpts) { 1079 if (wait) collection.add(m, callbackOpts); 1080 if (success) success.call(callbackOpts.context, m, resp, callbackOpts); 1081 }; 1082 model.save(null, options); 1083 return model; 1084 }, 1085 1086 // **parse** converts a response into a list of models to be added to the 1087 // collection. The default implementation is just to pass it through. 1088 parse: function(resp, options) { 1089 return resp; 1090 }, 1091 1092 // Create a new collection with an identical list of models as this one. 1093 clone: function() { 1094 return new this.constructor(this.models, { 1095 model: this.model, 1096 comparator: this.comparator 1097 }); 1098 }, 1099 1100 // Define how to uniquely identify models in the collection. 1101 modelId: function(attrs) { 1102 return attrs[this.model.prototype.idAttribute || 'id']; 1103 }, 1104 1105 // Get an iterator of all models in this collection. 1106 values: function() { 1107 return new CollectionIterator(this, ITERATOR_VALUES); 1108 }, 1109 1110 // Get an iterator of all model IDs in this collection. 1111 keys: function() { 1112 return new CollectionIterator(this, ITERATOR_KEYS); 1113 }, 1114 1115 // Get an iterator of all [ID, model] tuples in this collection. 1116 entries: function() { 1117 return new CollectionIterator(this, ITERATOR_KEYSVALUES); 1118 }, 1119 1120 // Private method to reset all internal state. Called when the collection 1121 // is first initialized or reset. 1122 _reset: function() { 1123 this.length = 0; 1124 this.models = []; 1125 this._byId = {}; 1126 }, 1127 1128 // Prepare a hash of attributes (or other model) to be added to this 1129 // collection. 1130 _prepareModel: function(attrs, options) { 1131 if (this._isModel(attrs)) { 1132 if (!attrs.collection) attrs.collection = this; 1133 return attrs; 1134 } 1135 options = options ? _.clone(options) : {}; 1136 options.collection = this; 1137 var model = new this.model(attrs, options); 1138 if (!model.validationError) return model; 1139 this.trigger('invalid', this, model.validationError, options); 1140 return false; 1141 }, 1142 1143 // Internal method called by both remove and set. 1144 _removeModels: function(models, options) { 1145 var removed = []; 1146 for (var i = 0; i < models.length; i++) { 1147 var model = this.get(models[i]); 1148 if (!model) continue; 1149 1150 var index = this.indexOf(model); 1151 this.models.splice(index, 1); 1152 this.length--; 1153 1154 // Remove references before triggering 'remove' event to prevent an 1155 // infinite loop. #3693 1156 delete this._byId[model.cid]; 1157 var id = this.modelId(model.attributes); 1158 if (id != null) delete this._byId[id]; 1159 1160 if (!options.silent) { 1161 options.index = index; 1162 model.trigger('remove', model, this, options); 1163 } 1164 1165 removed.push(model); 1166 this._removeReference(model, options); 1167 } 1168 return removed; 1169 }, 1170 1171 // Method for checking whether an object should be considered a model for 1172 // the purposes of adding to the collection. 1173 _isModel: function(model) { 1174 return model instanceof Model; 1175 }, 1176 1177 // Internal method to create a model's ties to a collection. 1178 _addReference: function(model, options) { 1179 this._byId[model.cid] = model; 1180 var id = this.modelId(model.attributes); 1181 if (id != null) this._byId[id] = model; 1182 model.on('all', this._onModelEvent, this); 1183 }, 1184 1185 // Internal method to sever a model's ties to a collection. 1186 _removeReference: function(model, options) { 1187 delete this._byId[model.cid]; 1188 var id = this.modelId(model.attributes); 1189 if (id != null) delete this._byId[id]; 1190 if (this === model.collection) delete model.collection; 1191 model.off('all', this._onModelEvent, this); 1192 }, 1193 1194 // Internal method called every time a model in the set fires an event. 1195 // Sets need to update their indexes when models change ids. All other 1196 // events simply proxy through. "add" and "remove" events that originate 1197 // in other collections are ignored. 1198 _onModelEvent: function(event, model, collection, options) { 1199 if (model) { 1200 if ((event === 'add' || event === 'remove') && collection !== this) return; 1201 if (event === 'destroy') this.remove(model, options); 1202 if (event === 'change') { 1203 var prevId = this.modelId(model.previousAttributes()); 1204 var id = this.modelId(model.attributes); 1205 if (prevId !== id) { 1206 if (prevId != null) delete this._byId[prevId]; 1207 if (id != null) this._byId[id] = model; 1208 } 1209 } 1210 } 1211 this.trigger.apply(this, arguments); 1212 } 1213 1214 }); 1215 1216 // Defining an @@iterator method implements JavaScript's Iterable protocol. 1217 // In modern ES2015 browsers, this value is found at Symbol.iterator. 1218 /* global Symbol */ 1219 var $$iterator = typeof Symbol === 'function' && Symbol.iterator; 1220 if ($$iterator) { 1221 Collection.prototype[$$iterator] = Collection.prototype.values; 1222 } 1223 1224 // CollectionIterator 1225 // ------------------ 1226 1227 // A CollectionIterator implements JavaScript's Iterator protocol, allowing the 1228 // use of `for of` loops in modern browsers and interoperation between 1229 // Backbone.Collection and other JavaScript functions and third-party libraries 1230 // which can operate on Iterables. 1231 var CollectionIterator = function(collection, kind) { 1232 this._collection = collection; 1233 this._kind = kind; 1234 this._index = 0; 1235 }; 1236 1237 // This "enum" defines the three possible kinds of values which can be emitted 1238 // by a CollectionIterator that correspond to the values(), keys() and entries() 1239 // methods on Collection, respectively. 1240 var ITERATOR_VALUES = 1; 1241 var ITERATOR_KEYS = 2; 1242 var ITERATOR_KEYSVALUES = 3; 1243 1244 // All Iterators should themselves be Iterable. 1245 if ($$iterator) { 1246 CollectionIterator.prototype[$$iterator] = function() { 1247 return this; 1248 }; 1249 } 1250 1251 CollectionIterator.prototype.next = function() { 1252 if (this._collection) { 1253 1254 // Only continue iterating if the iterated collection is long enough. 1255 if (this._index < this._collection.length) { 1256 var model = this._collection.at(this._index); 1257 this._index++; 1258 1259 // Construct a value depending on what kind of values should be iterated. 1260 var value; 1261 if (this._kind === ITERATOR_VALUES) { 1262 value = model; 1263 } else { 1264 var id = this._collection.modelId(model.attributes); 1265 if (this._kind === ITERATOR_KEYS) { 1266 value = id; 1267 } else { // ITERATOR_KEYSVALUES 1268 value = [id, model]; 1269 } 1270 } 1271 return {value: value, done: false}; 1272 } 1273 1274 // Once exhausted, remove the reference to the collection so future 1275 // calls to the next method always return done. 1276 this._collection = void 0; 1277 } 1278 1279 return {value: void 0, done: true}; 1280 }; 1281 1282 // Backbone.View 1283 // ------------- 1284 1285 // Backbone Views are almost more convention than they are actual code. A View 1286 // is simply a JavaScript object that represents a logical chunk of UI in the 1287 // DOM. This might be a single item, an entire list, a sidebar or panel, or 1288 // even the surrounding frame which wraps your whole app. Defining a chunk of 1289 // UI as a **View** allows you to define your DOM events declaratively, without 1290 // having to worry about render order ... and makes it easy for the view to 1291 // react to specific changes in the state of your models. 1292 1293 // Creating a Backbone.View creates its initial element outside of the DOM, 1294 // if an existing element is not provided... 1295 var View = Backbone.View = function(options) { 1296 this.cid = _.uniqueId('view'); 1297 this.preinitialize.apply(this, arguments); 1298 _.extend(this, _.pick(options, viewOptions)); 1299 this._ensureElement(); 1300 this.initialize.apply(this, arguments); 1301 }; 1302 1303 // Cached regex to split keys for `delegate`. 1304 var delegateEventSplitter = /^(\S+)\s*(.*)$/; 1305 1306 // List of view options to be set as properties. 1307 var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName', 'events']; 1308 1309 // Set up all inheritable **Backbone.View** properties and methods. 1310 _.extend(View.prototype, Events, { 1311 1312 // The default `tagName` of a View's element is `"div"`. 1313 tagName: 'div', 1314 1315 // jQuery delegate for element lookup, scoped to DOM elements within the 1316 // current view. This should be preferred to global lookups where possible. 1317 $: function(selector) { 1318 return this.$el.find(selector); 1319 }, 1320 1321 // preinitialize is an empty function by default. You can override it with a function 1322 // or object. preinitialize will run before any instantiation logic is run in the View 1323 preinitialize: function(){}, 1324 1325 // Initialize is an empty function by default. Override it with your own 1326 // initialization logic. 1327 initialize: function(){}, 1328 1329 // **render** is the core function that your view should override, in order 1330 // to populate its element (`this.el`), with the appropriate HTML. The 1331 // convention is for **render** to always return `this`. 1332 render: function() { 1333 return this; 1334 }, 1335 1336 // Remove this view by taking the element out of the DOM, and removing any 1337 // applicable Backbone.Events listeners. 1338 remove: function() { 1339 this._removeElement(); 1340 this.stopListening(); 1341 return this; 1342 }, 1343 1344 // Remove this view's element from the document and all event listeners 1345 // attached to it. Exposed for subclasses using an alternative DOM 1346 // manipulation API. 1347 _removeElement: function() { 1348 this.$el.remove(); 1349 }, 1350 1351 // Change the view's element (`this.el` property) and re-delegate the 1352 // view's events on the new element. 1353 setElement: function(element) { 1354 this.undelegateEvents(); 1355 this._setElement(element); 1356 this.delegateEvents(); 1357 return this; 1358 }, 1359 1360 // Creates the `this.el` and `this.$el` references for this view using the 1361 // given `el`. `el` can be a CSS selector or an HTML string, a jQuery 1362 // context or an element. Subclasses can override this to utilize an 1363 // alternative DOM manipulation API and are only required to set the 1364 // `this.el` property. 1365 _setElement: function(el) { 1366 this.$el = el instanceof Backbone.$ ? el : Backbone.$(el); 1367 this.el = this.$el[0]; 1368 }, 1369 1370 // Set callbacks, where `this.events` is a hash of 1371 // 1372 // *{"event selector": "callback"}* 1373 // 1374 // { 1375 // 'mousedown .title': 'edit', 1376 // 'click .button': 'save', 1377 // 'click .open': function(e) { ... } 1378 // } 1379 // 1380 // pairs. Callbacks will be bound to the view, with `this` set properly. 1381 // Uses event delegation for efficiency. 1382 // Omitting the selector binds the event to `this.el`. 1383 delegateEvents: function(events) { 1384 events || (events = _.result(this, 'events')); 1385 if (!events) return this; 1386 this.undelegateEvents(); 1387 for (var key in events) { 1388 var method = events[key]; 1389 if (!_.isFunction(method)) method = this[method]; 1390 if (!method) continue; 1391 var match = key.match(delegateEventSplitter); 1392 this.delegate(match[1], match[2], method.bind(this)); 1393 } 1394 return this; 1395 }, 1396 1397 // Add a single event listener to the view's element (or a child element 1398 // using `selector`). This only works for delegate-able events: not `focus`, 1399 // `blur`, and not `change`, `submit`, and `reset` in Internet Explorer. 1400 delegate: function(eventName, selector, listener) { 1401 this.$el.on(eventName + '.delegateEvents' + this.cid, selector, listener); 1402 return this; 1403 }, 1404 1405 // Clears all callbacks previously bound to the view by `delegateEvents`. 1406 // You usually don't need to use this, but may wish to if you have multiple 1407 // Backbone views attached to the same DOM element. 1408 undelegateEvents: function() { 1409 if (this.$el) this.$el.off('.delegateEvents' + this.cid); 1410 return this; 1411 }, 1412 1413 // A finer-grained `undelegateEvents` for removing a single delegated event. 1414 // `selector` and `listener` are both optional. 1415 undelegate: function(eventName, selector, listener) { 1416 this.$el.off(eventName + '.delegateEvents' + this.cid, selector, listener); 1417 return this; 1418 }, 1419 1420 // Produces a DOM element to be assigned to your view. Exposed for 1421 // subclasses using an alternative DOM manipulation API. 1422 _createElement: function(tagName) { 1423 return document.createElement(tagName); 1424 }, 1425 1426 // Ensure that the View has a DOM element to render into. 1427 // If `this.el` is a string, pass it through `$()`, take the first 1428 // matching element, and re-assign it to `el`. Otherwise, create 1429 // an element from the `id`, `className` and `tagName` properties. 1430 _ensureElement: function() { 1431 if (!this.el) { 1432 var attrs = _.extend({}, _.result(this, 'attributes')); 1433 if (this.id) attrs.id = _.result(this, 'id'); 1434 if (this.className) attrs['class'] = _.result(this, 'className'); 1435 this.setElement(this._createElement(_.result(this, 'tagName'))); 1436 this._setAttributes(attrs); 1437 } else { 1438 this.setElement(_.result(this, 'el')); 1439 } 1440 }, 1441 1442 // Set attributes from a hash on this view's element. Exposed for 1443 // subclasses using an alternative DOM manipulation API. 1444 _setAttributes: function(attributes) { 1445 this.$el.attr(attributes); 1446 } 1447 1448 }); 1449 1450 // Proxy Backbone class methods to Underscore functions, wrapping the model's 1451 // `attributes` object or collection's `models` array behind the scenes. 1452 // 1453 // collection.filter(function(model) { return model.get('age') > 10 }); 1454 // collection.each(this.addView); 1455 // 1456 // `Function#apply` can be slow so we use the method's arg count, if we know it. 1457 var addMethod = function(base, length, method, attribute) { 1458 switch (length) { 1459 case 1: return function() { 1460 return base[method](this[attribute]); 1461 }; 1462 case 2: return function(value) { 1463 return base[method](this[attribute], value); 1464 }; 1465 case 3: return function(iteratee, context) { 1466 return base[method](this[attribute], cb(iteratee, this), context); 1467 }; 1468 case 4: return function(iteratee, defaultVal, context) { 1469 return base[method](this[attribute], cb(iteratee, this), defaultVal, context); 1470 }; 1471 default: return function() { 1472 var args = slice.call(arguments); 1473 args.unshift(this[attribute]); 1474 return base[method].apply(base, args); 1475 }; 1476 } 1477 }; 1478 1479 var addUnderscoreMethods = function(Class, base, methods, attribute) { 1480 _.each(methods, function(length, method) { 1481 if (base[method]) Class.prototype[method] = addMethod(base, length, method, attribute); 1482 }); 1483 }; 1484 1485 // Support `collection.sortBy('attr')` and `collection.findWhere({id: 1})`. 1486 var cb = function(iteratee, instance) { 1487 if (_.isFunction(iteratee)) return iteratee; 1488 if (_.isObject(iteratee) && !instance._isModel(iteratee)) return modelMatcher(iteratee); 1489 if (_.isString(iteratee)) return function(model) { return model.get(iteratee); }; 1490 return iteratee; 1491 }; 1492 var modelMatcher = function(attrs) { 1493 var matcher = _.matches(attrs); 1494 return function(model) { 1495 return matcher(model.attributes); 1496 }; 1497 }; 1498 1499 // Underscore methods that we want to implement on the Collection. 1500 // 90% of the core usefulness of Backbone Collections is actually implemented 1501 // right here: 1502 var collectionMethods = {forEach: 3, each: 3, map: 3, collect: 3, reduce: 0, 1503 foldl: 0, inject: 0, reduceRight: 0, foldr: 0, find: 3, detect: 3, filter: 3, 1504 select: 3, reject: 3, every: 3, all: 3, some: 3, any: 3, include: 3, includes: 3, 1505 contains: 3, invoke: 0, max: 3, min: 3, toArray: 1, size: 1, first: 3, 1506 head: 3, take: 3, initial: 3, rest: 3, tail: 3, drop: 3, last: 3, 1507 without: 0, difference: 0, indexOf: 3, shuffle: 1, lastIndexOf: 3, 1508 isEmpty: 1, chain: 1, sample: 3, partition: 3, groupBy: 3, countBy: 3, 1509 sortBy: 3, indexBy: 3, findIndex: 3, findLastIndex: 3}; 1510 1511 1512 // Underscore methods that we want to implement on the Model, mapped to the 1513 // number of arguments they take. 1514 var modelMethods = {keys: 1, values: 1, pairs: 1, invert: 1, pick: 0, 1515 omit: 0, chain: 1, isEmpty: 1}; 1516 1517 // Mix in each Underscore method as a proxy to `Collection#models`. 1518 1519 _.each([ 1520 [Collection, collectionMethods, 'models'], 1521 [Model, modelMethods, 'attributes'] 1522 ], function(config) { 1523 var Base = config[0], 1524 methods = config[1], 1525 attribute = config[2]; 1526 1527 Base.mixin = function(obj) { 1528 var mappings = _.reduce(_.functions(obj), function(memo, name) { 1529 memo[name] = 0; 1530 return memo; 1531 }, {}); 1532 addUnderscoreMethods(Base, obj, mappings, attribute); 1533 }; 1534 1535 addUnderscoreMethods(Base, _, methods, attribute); 1536 }); 1537 1538 // Backbone.sync 1539 // ------------- 1540 1541 // Override this function to change the manner in which Backbone persists 1542 // models to the server. You will be passed the type of request, and the 1543 // model in question. By default, makes a RESTful Ajax request 1544 // to the model's `url()`. Some possible customizations could be: 1545 // 1546 // * Use `setTimeout` to batch rapid-fire updates into a single request. 1547 // * Send up the models as XML instead of JSON. 1548 // * Persist models via WebSockets instead of Ajax. 1549 // 1550 // Turn on `Backbone.emulateHTTP` in order to send `PUT` and `DELETE` requests 1551 // as `POST`, with a `_method` parameter containing the true HTTP method, 1552 // as well as all requests with the body as `application/x-www-form-urlencoded` 1553 // instead of `application/json` with the model in a param named `model`. 1554 // Useful when interfacing with server-side languages like **PHP** that make 1555 // it difficult to read the body of `PUT` requests. 1556 Backbone.sync = function(method, model, options) { 1557 var type = methodMap[method]; 1558 1559 // Default options, unless specified. 1560 _.defaults(options || (options = {}), { 1561 emulateHTTP: Backbone.emulateHTTP, 1562 emulateJSON: Backbone.emulateJSON 1563 }); 1564 1565 // Default JSON-request options. 1566 var params = {type: type, dataType: 'json'}; 1567 1568 // Ensure that we have a URL. 1569 if (!options.url) { 1570 params.url = _.result(model, 'url') || urlError(); 1571 } 1572 1573 // Ensure that we have the appropriate request data. 1574 if (options.data == null && model && (method === 'create' || method === 'update' || method === 'patch')) { 1575 params.contentType = 'application/json'; 1576 params.data = JSON.stringify(options.attrs || model.toJSON(options)); 1577 } 1578 1579 // For older servers, emulate JSON by encoding the request into an HTML-form. 1580 if (options.emulateJSON) { 1581 params.contentType = 'application/x-www-form-urlencoded'; 1582 params.data = params.data ? {model: params.data} : {}; 1583 } 1584 1585 // For older servers, emulate HTTP by mimicking the HTTP method with `_method` 1586 // And an `X-HTTP-Method-Override` header. 1587 if (options.emulateHTTP && (type === 'PUT' || type === 'DELETE' || type === 'PATCH')) { 1588 params.type = 'POST'; 1589 if (options.emulateJSON) params.data._method = type; 1590 var beforeSend = options.beforeSend; 1591 options.beforeSend = function(xhr) { 1592 xhr.setRequestHeader('X-HTTP-Method-Override', type); 1593 if (beforeSend) return beforeSend.apply(this, arguments); 1594 }; 1595 } 1596 1597 // Don't process data on a non-GET request. 1598 if (params.type !== 'GET' && !options.emulateJSON) { 1599 params.processData = false; 1600 } 1601 1602 // Pass along `textStatus` and `errorThrown` from jQuery. 1603 var error = options.error; 1604 options.error = function(xhr, textStatus, errorThrown) { 1605 options.textStatus = textStatus; 1606 options.errorThrown = errorThrown; 1607 if (error) error.call(options.context, xhr, textStatus, errorThrown); 1608 }; 1609 1610 // Make the request, allowing the user to override any Ajax options. 1611 var xhr = options.xhr = Backbone.ajax(_.extend(params, options)); 1612 model.trigger('request', model, xhr, options); 1613 return xhr; 1614 }; 1615 1616 // Map from CRUD to HTTP for our default `Backbone.sync` implementation. 1617 var methodMap = { 1618 create: 'POST', 1619 update: 'PUT', 1620 patch: 'PATCH', 1621 delete: 'DELETE', 1622 read: 'GET' 1623 }; 1624 1625 // Set the default implementation of `Backbone.ajax` to proxy through to `$`. 1626 // Override this if you'd like to use a different library. 1627 Backbone.ajax = function() { 1628 return Backbone.$.ajax.apply(Backbone.$, arguments); 1629 }; 1630 1631 // Backbone.Router 1632 // --------------- 1633 1634 // Routers map faux-URLs to actions, and fire events when routes are 1635 // matched. Creating a new one sets its `routes` hash, if not set statically. 1636 var Router = Backbone.Router = function(options) { 1637 options || (options = {}); 1638 this.preinitialize.apply(this, arguments); 1639 if (options.routes) this.routes = options.routes; 1640 this._bindRoutes(); 1641 this.initialize.apply(this, arguments); 1642 }; 1643 1644 // Cached regular expressions for matching named param parts and splatted 1645 // parts of route strings. 1646 var optionalParam = /\((.*?)\)/g; 1647 var namedParam = /(\(\?)?:\w+/g; 1648 var splatParam = /\*\w+/g; 1649 var escapeRegExp = /[\-{}\[\]+?.,\\\^$|#\s]/g; 1650 1651 // Set up all inheritable **Backbone.Router** properties and methods. 1652 _.extend(Router.prototype, Events, { 1653 1654 // preinitialize is an empty function by default. You can override it with a function 1655 // or object. preinitialize will run before any instantiation logic is run in the Router. 1656 preinitialize: function(){}, 1657 1658 // Initialize is an empty function by default. Override it with your own 1659 // initialization logic. 1660 initialize: function(){}, 1661 1662 // Manually bind a single named route to a callback. For example: 1663 // 1664 // this.route('search/:query/p:num', 'search', function(query, num) { 1665 // ... 1666 // }); 1667 // 1668 route: function(route, name, callback) { 1669 if (!_.isRegExp(route)) route = this._routeToRegExp(route); 1670 if (_.isFunction(name)) { 1671 callback = name; 1672 name = ''; 1673 } 1674 if (!callback) callback = this[name]; 1675 var router = this; 1676 Backbone.history.route(route, function(fragment) { 1677 var args = router._extractParameters(route, fragment); 1678 if (router.execute(callback, args, name) !== false) { 1679 router.trigger.apply(router, ['route:' + name].concat(args)); 1680 router.trigger('route', name, args); 1681 Backbone.history.trigger('route', router, name, args); 1682 } 1683 }); 1684 return this; 1685 }, 1686 1687 // Execute a route handler with the provided parameters. This is an 1688 // excellent place to do pre-route setup or post-route cleanup. 1689 execute: function(callback, args, name) { 1690 if (callback) callback.apply(this, args); 1691 }, 1692 1693 // Simple proxy to `Backbone.history` to save a fragment into the history. 1694 navigate: function(fragment, options) { 1695 Backbone.history.navigate(fragment, options); 1696 return this; 1697 }, 1698 1699 // Bind all defined routes to `Backbone.history`. We have to reverse the 1700 // order of the routes here to support behavior where the most general 1701 // routes can be defined at the bottom of the route map. 1702 _bindRoutes: function() { 1703 if (!this.routes) return; 1704 this.routes = _.result(this, 'routes'); 1705 var route, routes = _.keys(this.routes); 1706 while ((route = routes.pop()) != null) { 1707 this.route(route, this.routes[route]); 1708 } 1709 }, 1710 1711 // Convert a route string into a regular expression, suitable for matching 1712 // against the current location hash. 1713 _routeToRegExp: function(route) { 1714 route = route.replace(escapeRegExp, '\\$&') 1715 .replace(optionalParam, '(?:$1)?') 1716 .replace(namedParam, function(match, optional) { 1717 return optional ? match : '([^/?]+)'; 1718 }) 1719 .replace(splatParam, '([^?]*?)'); 1720 return new RegExp('^' + route + '(?:\\?([\\s\\S]*))?$'); 1721 }, 1722 1723 // Given a route, and a URL fragment that it matches, return the array of 1724 // extracted decoded parameters. Empty or unmatched parameters will be 1725 // treated as `null` to normalize cross-browser behavior. 1726 _extractParameters: function(route, fragment) { 1727 var params = route.exec(fragment).slice(1); 1728 return _.map(params, function(param, i) { 1729 // Don't decode the search params. 1730 if (i === params.length - 1) return param || null; 1731 return param ? decodeURIComponent(param) : null; 1732 }); 1733 } 1734 1735 }); 1736 1737 // Backbone.History 1738 // ---------------- 1739 1740 // Handles cross-browser history management, based on either 1741 // [pushState](http://diveintohtml5.info/history.html) and real URLs, or 1742 // [onhashchange](https://developer.mozilla.org/en-US/docs/DOM/window.onhashchange) 1743 // and URL fragments. If the browser supports neither (old IE, natch), 1744 // falls back to polling. 1745 var History = Backbone.History = function() { 1746 this.handlers = []; 1747 this.checkUrl = this.checkUrl.bind(this); 1748 1749 // Ensure that `History` can be used outside of the browser. 1750 if (typeof window !== 'undefined') { 1751 this.location = window.location; 1752 this.history = window.history; 1753 } 1754 }; 1755 1756 // Cached regex for stripping a leading hash/slash and trailing space. 1757 var routeStripper = /^[#\/]|\s+$/g; 1758 1759 // Cached regex for stripping leading and trailing slashes. 1760 var rootStripper = /^\/+|\/+$/g; 1761 1762 // Cached regex for stripping urls of hash. 1763 var pathStripper = /#.*$/; 1764 1765 // Has the history handling already been started? 1766 History.started = false; 1767 1768 // Set up all inheritable **Backbone.History** properties and methods. 1769 _.extend(History.prototype, Events, { 1770 1771 // The default interval to poll for hash changes, if necessary, is 1772 // twenty times a second. 1773 interval: 50, 1774 1775 // Are we at the app root? 1776 atRoot: function() { 1777 var path = this.location.pathname.replace(/[^\/]$/, '$&/'); 1778 return path === this.root && !this.getSearch(); 1779 }, 1780 1781 // Does the pathname match the root? 1782 matchRoot: function() { 1783 var path = this.decodeFragment(this.location.pathname); 1784 var rootPath = path.slice(0, this.root.length - 1) + '/'; 1785 return rootPath === this.root; 1786 }, 1787 1788 // Unicode characters in `location.pathname` are percent encoded so they're 1789 // decoded for comparison. `%25` should not be decoded since it may be part 1790 // of an encoded parameter. 1791 decodeFragment: function(fragment) { 1792 return decodeURI(fragment.replace(/%25/g, '%2525')); 1793 }, 1794 1795 // In IE6, the hash fragment and search params are incorrect if the 1796 // fragment contains `?`. 1797 getSearch: function() { 1798 var match = this.location.href.replace(/#.*/, '').match(/\?.+/); 1799 return match ? match[0] : ''; 1800 }, 1801 1802 // Gets the true hash value. Cannot use location.hash directly due to bug 1803 // in Firefox where location.hash will always be decoded. 1804 getHash: function(window) { 1805 var match = (window || this).location.href.match(/#(.*)$/); 1806 return match ? match[1] : ''; 1807 }, 1808 1809 // Get the pathname and search params, without the root. 1810 getPath: function() { 1811 var path = this.decodeFragment( 1812 this.location.pathname + this.getSearch() 1813 ).slice(this.root.length - 1); 1814 return path.charAt(0) === '/' ? path.slice(1) : path; 1815 }, 1816 1817 // Get the cross-browser normalized URL fragment from the path or hash. 1818 getFragment: function(fragment) { 1819 if (fragment == null) { 1820 if (this._usePushState || !this._wantsHashChange) { 1821 fragment = this.getPath(); 1822 } else { 1823 fragment = this.getHash(); 1824 } 1825 } 1826 return fragment.replace(routeStripper, ''); 1827 }, 1828 1829 // Start the hash change handling, returning `true` if the current URL matches 1830 // an existing route, and `false` otherwise. 1831 start: function(options) { 1832 if (History.started) throw new Error('Backbone.history has already been started'); 1833 History.started = true; 1834 1835 // Figure out the initial configuration. Do we need an iframe? 1836 // Is pushState desired ... is it available? 1837 this.options = _.extend({root: '/'}, this.options, options); 1838 this.root = this.options.root; 1839 this._wantsHashChange = this.options.hashChange !== false; 1840 this._hasHashChange = 'onhashchange' in window && (document.documentMode === void 0 || document.documentMode > 7); 1841 this._useHashChange = this._wantsHashChange && this._hasHashChange; 1842 this._wantsPushState = !!this.options.pushState; 1843 this._hasPushState = !!(this.history && this.history.pushState); 1844 this._usePushState = this._wantsPushState && this._hasPushState; 1845 this.fragment = this.getFragment(); 1846 1847 // Normalize root to always include a leading and trailing slash. 1848 this.root = ('/' + this.root + '/').replace(rootStripper, '/'); 1849 1850 // Transition from hashChange to pushState or vice versa if both are 1851 // requested. 1852 if (this._wantsHashChange && this._wantsPushState) { 1853 1854 // If we've started off with a route from a `pushState`-enabled 1855 // browser, but we're currently in a browser that doesn't support it... 1856 if (!this._hasPushState && !this.atRoot()) { 1857 var rootPath = this.root.slice(0, -1) || '/'; 1858 this.location.replace(rootPath + '#' + this.getPath()); 1859 // Return immediately as browser will do redirect to new url 1860 return true; 1861 1862 // Or if we've started out with a hash-based route, but we're currently 1863 // in a browser where it could be `pushState`-based instead... 1864 } else if (this._hasPushState && this.atRoot()) { 1865 this.navigate(this.getHash(), {replace: true}); 1866 } 1867 1868 } 1869 1870 // Proxy an iframe to handle location events if the browser doesn't 1871 // support the `hashchange` event, HTML5 history, or the user wants 1872 // `hashChange` but not `pushState`. 1873 if (!this._hasHashChange && this._wantsHashChange && !this._usePushState) { 1874 this.iframe = document.createElement('iframe'); 1875 this.iframe.src = 'javascript:0'; 1876 this.iframe.style.display = 'none'; 1877 this.iframe.tabIndex = -1; 1878 var body = document.body; 1879 // Using `appendChild` will throw on IE < 9 if the document is not ready. 1880 var iWindow = body.insertBefore(this.iframe, body.firstChild).contentWindow; 1881 iWindow.document.open(); 1882 iWindow.document.close(); 1883 iWindow.location.hash = '#' + this.fragment; 1884 } 1885 1886 // Add a cross-platform `addEventListener` shim for older browsers. 1887 var addEventListener = window.addEventListener || function(eventName, listener) { 1888 return attachEvent('on' + eventName, listener); 1889 }; 1890 1891 // Depending on whether we're using pushState or hashes, and whether 1892 // 'onhashchange' is supported, determine how we check the URL state. 1893 if (this._usePushState) { 1894 addEventListener('popstate', this.checkUrl, false); 1895 } else if (this._useHashChange && !this.iframe) { 1896 addEventListener('hashchange', this.checkUrl, false); 1897 } else if (this._wantsHashChange) { 1898 this._checkUrlInterval = setInterval(this.checkUrl, this.interval); 1899 } 1900 1901 if (!this.options.silent) return this.loadUrl(); 1902 }, 1903 1904 // Disable Backbone.history, perhaps temporarily. Not useful in a real app, 1905 // but possibly useful for unit testing Routers. 1906 stop: function() { 1907 // Add a cross-platform `removeEventListener` shim for older browsers. 1908 var removeEventListener = window.removeEventListener || function(eventName, listener) { 1909 return detachEvent('on' + eventName, listener); 1910 }; 1911 1912 // Remove window listeners. 1913 if (this._usePushState) { 1914 removeEventListener('popstate', this.checkUrl, false); 1915 } else if (this._useHashChange && !this.iframe) { 1916 removeEventListener('hashchange', this.checkUrl, false); 1917 } 1918 1919 // Clean up the iframe if necessary. 1920 if (this.iframe) { 1921 document.body.removeChild(this.iframe); 1922 this.iframe = null; 1923 } 1924 1925 // Some environments will throw when clearing an undefined interval. 1926 if (this._checkUrlInterval) clearInterval(this._checkUrlInterval); 1927 History.started = false; 1928 }, 1929 1930 // Add a route to be tested when the fragment changes. Routes added later 1931 // may override previous routes. 1932 route: function(route, callback) { 1933 this.handlers.unshift({route: route, callback: callback}); 1934 }, 1935 1936 // Checks the current URL to see if it has changed, and if it has, 1937 // calls `loadUrl`, normalizing across the hidden iframe. 1938 checkUrl: function(e) { 1939 var current = this.getFragment(); 1940 1941 // If the user pressed the back button, the iframe's hash will have 1942 // changed and we should use that for comparison. 1943 if (current === this.fragment && this.iframe) { 1944 current = this.getHash(this.iframe.contentWindow); 1945 } 1946 1947 if (current === this.fragment) return false; 1948 if (this.iframe) this.navigate(current); 1949 this.loadUrl(); 1950 }, 1951 1952 // Attempt to load the current URL fragment. If a route succeeds with a 1953 // match, returns `true`. If no defined routes matches the fragment, 1954 // returns `false`. 1955 loadUrl: function(fragment) { 1956 // If the root doesn't match, no routes can match either. 1957 if (!this.matchRoot()) return false; 1958 fragment = this.fragment = this.getFragment(fragment); 1959 return _.some(this.handlers, function(handler) { 1960 if (handler.route.test(fragment)) { 1961 handler.callback(fragment); 1962 return true; 1963 } 1964 }); 1965 }, 1966 1967 // Save a fragment into the hash history, or replace the URL state if the 1968 // 'replace' option is passed. You are responsible for properly URL-encoding 1969 // the fragment in advance. 1970 // 1971 // The options object can contain `trigger: true` if you wish to have the 1972 // route callback be fired (not usually desirable), or `replace: true`, if 1973 // you wish to modify the current URL without adding an entry to the history. 1974 navigate: function(fragment, options) { 1975 if (!History.started) return false; 1976 if (!options || options === true) options = {trigger: !!options}; 1977 1978 // Normalize the fragment. 1979 fragment = this.getFragment(fragment || ''); 1980 1981 // Don't include a trailing slash on the root. 1982 var rootPath = this.root; 1983 if (fragment === '' || fragment.charAt(0) === '?') { 1984 rootPath = rootPath.slice(0, -1) || '/'; 1985 } 1986 var url = rootPath + fragment; 1987 1988 // Strip the fragment of the query and hash for matching. 1989 fragment = fragment.replace(pathStripper, ''); 1990 1991 // Decode for matching. 1992 var decodedFragment = this.decodeFragment(fragment); 1993 1994 if (this.fragment === decodedFragment) return; 1995 this.fragment = decodedFragment; 1996 1997 // If pushState is available, we use it to set the fragment as a real URL. 1998 if (this._usePushState) { 1999 this.history[options.replace ? 'replaceState' : 'pushState']({}, document.title, url); 2000 2001 // If hash changes haven't been explicitly disabled, update the hash 2002 // fragment to store history. 2003 } else if (this._wantsHashChange) { 2004 this._updateHash(this.location, fragment, options.replace); 2005 if (this.iframe && fragment !== this.getHash(this.iframe.contentWindow)) { 2006 var iWindow = this.iframe.contentWindow; 2007 2008 // Opening and closing the iframe tricks IE7 and earlier to push a 2009 // history entry on hash-tag change. When replace is true, we don't 2010 // want this. 2011 if (!options.replace) { 2012 iWindow.document.open(); 2013 iWindow.document.close(); 2014 } 2015 2016 this._updateHash(iWindow.location, fragment, options.replace); 2017 } 2018 2019 // If you've told us that you explicitly don't want fallback hashchange- 2020 // based history, then `navigate` becomes a page refresh. 2021 } else { 2022 return this.location.assign(url); 2023 } 2024 if (options.trigger) return this.loadUrl(fragment); 2025 }, 2026 2027 // Update the hash location, either replacing the current entry, or adding 2028 // a new one to the browser history. 2029 _updateHash: function(location, fragment, replace) { 2030 if (replace) { 2031 var href = location.href.replace(/(javascript:|#).*$/, ''); 2032 location.replace(href + '#' + fragment); 2033 } else { 2034 // Some browsers require that `hash` contains a leading #. 2035 location.hash = '#' + fragment; 2036 } 2037 } 2038 2039 }); 2040 2041 // Create the default Backbone.history. 2042 Backbone.history = new History; 2043 2044 // Helpers 2045 // ------- 2046 2047 // Helper function to correctly set up the prototype chain for subclasses. 2048 // Similar to `goog.inherits`, but uses a hash of prototype properties and 2049 // class properties to be extended. 2050 var extend = function(protoProps, staticProps) { 2051 var parent = this; 2052 var child; 2053 2054 // The constructor function for the new subclass is either defined by you 2055 // (the "constructor" property in your `extend` definition), or defaulted 2056 // by us to simply call the parent constructor. 2057 if (protoProps && _.has(protoProps, 'constructor')) { 2058 child = protoProps.constructor; 2059 } else { 2060 child = function(){ return parent.apply(this, arguments); }; 2061 } 2062 2063 // Add static properties to the constructor function, if supplied. 2064 _.extend(child, parent, staticProps); 2065 2066 // Set the prototype chain to inherit from `parent`, without calling 2067 // `parent`'s constructor function and add the prototype properties. 2068 child.prototype = _.create(parent.prototype, protoProps); 2069 child.prototype.constructor = child; 2070 2071 // Set a convenience property in case the parent's prototype is needed 2072 // later. 2073 child.__super__ = parent.prototype; 2074 2075 return child; 2076 }; 2077 2078 // Set up inheritance for the model, collection, router, view and history. 2079 Model.extend = Collection.extend = Router.extend = View.extend = History.extend = extend; 2080 2081 // Throw an error when a URL is needed, and none is supplied. 2082 var urlError = function() { 2083 throw new Error('A "url" property or function must be specified'); 2084 }; 2085 2086 // Wrap an optional error callback with a fallback error event. 2087 var wrapError = function(model, options) { 2088 var error = options.error; 2089 options.error = function(resp) { 2090 if (error) error.call(options.context, model, resp, options); 2091 model.trigger('error', model, resp, options); 2092 }; 2093 }; 2094 2095 return Backbone; 2096 });
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| Generated: Thu Oct 28 01:00:03 2021 | Cross-referenced by PHPXref 0.7.1 |