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/wp-includes/js/ -> admin-bar.js (source)

   1  /**
   2   * @output wp-includes/js/admin-bar.js
   3   */
   4  /**
   5   * Admin bar with Vanilla JS, no external dependencies.
   6   *
   7   * @since 5.3.1
   8   *
   9   * @param {Object} document  The document object.
  10   * @param {Object} window    The window object.
  11   * @param {Object} navigator The navigator object.
  12   *
  13   * @return {void}
  14   */
  15  ( function( document, window, navigator ) {
  16      document.addEventListener( 'DOMContentLoaded', function() {
  17          var adminBar = document.getElementById( 'wpadminbar' ),
  18              topMenuItems,
  19              allMenuItems,
  20              adminBarLogout,
  21              adminBarSearchForm,
  22              shortlink,
  23              skipLink,
  24              mobileEvent,
  25              adminBarSearchInput,
  26              i;
  27  
  28          if ( ! adminBar || ! ( 'querySelectorAll' in adminBar ) ) {
  29              return;
  30          }
  31  
  32          topMenuItems = adminBar.querySelectorAll( 'li.menupop' );
  33          allMenuItems = adminBar.querySelectorAll( '.ab-item' );
  34          adminBarLogout = document.getElementById( 'wp-admin-bar-logout' );
  35          adminBarSearchForm = document.getElementById( 'adminbarsearch' );
  36          shortlink = document.getElementById( 'wp-admin-bar-get-shortlink' );
  37          skipLink = adminBar.querySelector( '.screen-reader-shortcut' );
  38          mobileEvent = /Mobile\/.+Safari/.test( navigator.userAgent ) ? 'touchstart' : 'click';
  39  
  40          // Remove nojs class after the DOM is loaded.
  41          removeClass( adminBar, 'nojs' );
  42  
  43          if ( 'ontouchstart' in window ) {
  44              // Remove hover class when the user touches outside the menu items.
  45              document.body.addEventListener( mobileEvent, function( e ) {
  46                  if ( ! getClosest( e.target, 'li.menupop' ) ) {
  47                      removeAllHoverClass( topMenuItems );
  48                  }
  49              } );
  50  
  51              // Add listener for menu items to toggle hover class by touches.
  52              // Remove the callback later for better performance.
  53              adminBar.addEventListener( 'touchstart', function bindMobileEvents() {
  54                  for ( var i = 0; i < topMenuItems.length; i++ ) {
  55                      topMenuItems[i].addEventListener( 'click', mobileHover.bind( null, topMenuItems ) );
  56                  }
  57  
  58                  adminBar.removeEventListener( 'touchstart', bindMobileEvents );
  59              } );
  60          }
  61  
  62          // Scroll page to top when clicking on the admin bar.
  63          adminBar.addEventListener( 'click', scrollToTop );
  64  
  65          for ( i = 0; i < topMenuItems.length; i++ ) {
  66              // Adds or removes the hover class based on the hover intent.
  67              window.hoverintent(
  68                  topMenuItems[i],
  69                  addClass.bind( null, topMenuItems[i], 'hover' ),
  70                  removeClass.bind( null, topMenuItems[i], 'hover' )
  71              ).options( {
  72                  timeout: 180
  73              } );
  74  
  75              // Toggle hover class if the enter key is pressed.
  76              topMenuItems[i].addEventListener( 'keydown', toggleHoverIfEnter );
  77          }
  78  
  79          // Remove hover class if the escape key is pressed.
  80          for ( i = 0; i < allMenuItems.length; i++ ) {
  81              allMenuItems[i].addEventListener( 'keydown', removeHoverIfEscape );
  82          }
  83  
  84          if ( adminBarSearchForm ) {
  85              adminBarSearchInput = document.getElementById( 'adminbar-search' );
  86  
  87              // Adds the adminbar-focused class on focus.
  88              adminBarSearchInput.addEventListener( 'focus', function() {
  89                  addClass( adminBarSearchForm, 'adminbar-focused' );
  90              } );
  91  
  92              // Removes the adminbar-focused class on blur.
  93              adminBarSearchInput.addEventListener( 'blur', function() {
  94                  removeClass( adminBarSearchForm, 'adminbar-focused' );
  95              } );
  96          }
  97  
  98          if ( skipLink ) {
  99              // Focus the target of skip link after pressing Enter.
 100              skipLink.addEventListener( 'keydown', focusTargetAfterEnter );
 101          }
 102  
 103          if ( shortlink ) {
 104              shortlink.addEventListener( 'click', clickShortlink );
 105          }
 106  
 107          // Prevents the toolbar from covering up content when a hash is present in the URL.
 108          if ( window.location.hash ) {
 109              window.scrollBy( 0, -32 );
 110          }
 111  
 112          // Clear sessionStorage on logging out.
 113          if ( adminBarLogout ) {
 114              adminBarLogout.addEventListener( 'click', emptySessionStorage );
 115          }
 116      } );
 117  
 118      /**
 119       * Remove hover class for top level menu item when escape is pressed.
 120       *
 121       * @since 5.3.1
 122       *
 123       * @param {Event} event The keydown event.
 124       */
 125  	function removeHoverIfEscape( event ) {
 126          var wrapper;
 127  
 128          if ( event.which !== 27 ) {
 129              return;
 130          }
 131  
 132          wrapper = getClosest( event.target, '.menupop' );
 133  
 134          if ( ! wrapper ) {
 135              return;
 136          }
 137  
 138          wrapper.querySelector( '.menupop > .ab-item' ).focus();
 139          removeClass( wrapper, 'hover' );
 140      }
 141  
 142      /**
 143       * Toggle hover class for top level menu item when enter is pressed.
 144       *
 145       * @since 5.3.1
 146       *
 147       * @param {Event} event The keydown event.
 148       */
 149  	function toggleHoverIfEnter( event ) {
 150          var wrapper;
 151  
 152          if ( event.which !== 13 ) {
 153              return;
 154          }
 155  
 156          if ( !! getClosest( event.target, '.ab-sub-wrapper' ) ) {
 157              return;
 158          }
 159  
 160          wrapper = getClosest( event.target, '.menupop' );
 161  
 162          if ( ! wrapper ) {
 163              return;
 164          }
 165  
 166          event.preventDefault();
 167  
 168          if ( hasClass( wrapper, 'hover' ) ) {
 169              removeClass( wrapper, 'hover' );
 170          } else {
 171              addClass( wrapper, 'hover' );
 172          }
 173      }
 174  
 175      /**
 176       * Focus the target of skip link after pressing Enter.
 177       *
 178       * @since 5.3.1
 179       *
 180       * @param {Event} event The keydown event.
 181       */
 182  	function focusTargetAfterEnter( event ) {
 183          var id, userAgent;
 184  
 185          if ( event.which !== 13 ) {
 186              return;
 187          }
 188  
 189          id = event.target.getAttribute( 'href' );
 190          userAgent = navigator.userAgent.toLowerCase();
 191  
 192          if ( userAgent.indexOf( 'applewebkit' ) > -1 && id && id.charAt( 0 ) === '#' ) {
 193              setTimeout( function() {
 194                  var target = document.getElementById( id.replace( '#', '' ) );
 195  
 196                  if ( target ) {
 197                      target.setAttribute( 'tabIndex', '0' );
 198                      target.focus();
 199                  }
 200              }, 100 );
 201          }
 202      }
 203  
 204      /**
 205       * Toogle hover class for mobile devices.
 206       *
 207       * @since 5.3.1
 208       *
 209       * @param {NodeList} topMenuItems All menu items.
 210       * @param {Event} event The click event.
 211       */
 212  	function mobileHover( topMenuItems, event ) {
 213          var wrapper;
 214  
 215          if ( !! getClosest( event.target, '.ab-sub-wrapper' ) ) {
 216              return;
 217          }
 218  
 219          event.preventDefault();
 220  
 221          wrapper = getClosest( event.target, '.menupop' );
 222  
 223          if ( ! wrapper ) {
 224              return;
 225          }
 226  
 227          if ( hasClass( wrapper, 'hover' ) ) {
 228              removeClass( wrapper, 'hover' );
 229          } else {
 230              removeAllHoverClass( topMenuItems );
 231              addClass( wrapper, 'hover' );
 232          }
 233      }
 234  
 235      /**
 236       * Handles the click on the Shortlink link in the adminbar.
 237       *
 238       * @since 3.1.0
 239       * @since 5.3.1 Use querySelector to clean up the function.
 240       *
 241       * @param {Event} event The click event.
 242       * @return {boolean} Returns false to prevent default click behavior.
 243       */
 244  	function clickShortlink( event ) {
 245          var wrapper = event.target.parentNode,
 246              input;
 247  
 248          if ( wrapper ) {
 249              input = wrapper.querySelector( '.shortlink-input' );
 250          }
 251  
 252          if ( ! input ) {
 253              return;
 254          }
 255  
 256          // (Old) IE doesn't support preventDefault, and does support returnValue.
 257          if ( event.preventDefault ) {
 258              event.preventDefault();
 259          }
 260  
 261          event.returnValue = false;
 262  
 263          addClass( wrapper, 'selected' );
 264  
 265          input.focus();
 266          input.select();
 267          input.onblur = function() {
 268              removeClass( wrapper, 'selected' );
 269          };
 270  
 271          return false;
 272      }
 273  
 274      /**
 275       * Clear sessionStorage on logging out.
 276       *
 277       * @since 5.3.1
 278       */
 279  	function emptySessionStorage() {
 280          if ( 'sessionStorage' in window ) {
 281              try {
 282                  for ( var key in sessionStorage ) {
 283                      if ( key.indexOf( 'wp-autosave-' ) > -1 ) {
 284                          sessionStorage.removeItem( key );
 285                      }
 286                  }
 287              } catch ( er ) {}
 288          }
 289      }
 290  
 291      /**
 292       * Check if element has class.
 293       *
 294       * @since 5.3.1
 295       *
 296       * @param {HTMLElement} element The HTML element.
 297       * @param {string}      className The class name.
 298       * @return {boolean} Whether the element has the className.
 299       */
 300  	function hasClass( element, className ) {
 301          var classNames;
 302  
 303          if ( ! element ) {
 304              return false;
 305          }
 306  
 307          if ( element.classList && element.classList.contains ) {
 308              return element.classList.contains( className );
 309          } else if ( element.className ) {
 310              classNames = element.className.split( ' ' );
 311              return classNames.indexOf( className ) > -1;
 312          }
 313  
 314          return false;
 315      }
 316  
 317      /**
 318       * Add class to an element.
 319       *
 320       * @since 5.3.1
 321       *
 322       * @param {HTMLElement} element The HTML element.
 323       * @param {string}      className The class name.
 324       */
 325  	function addClass( element, className ) {
 326          if ( ! element ) {
 327              return;
 328          }
 329  
 330          if ( element.classList && element.classList.add ) {
 331              element.classList.add( className );
 332          } else if ( ! hasClass( element, className ) ) {
 333              if ( element.className ) {
 334                  element.className += ' ';
 335              }
 336  
 337              element.className += className;
 338          }
 339      }
 340  
 341      /**
 342       * Remove class from an element.
 343       *
 344       * @since 5.3.1
 345       *
 346       * @param {HTMLElement} element The HTML element.
 347       * @param {string}      className The class name.
 348       */
 349  	function removeClass( element, className ) {
 350          var testName,
 351              classes;
 352  
 353          if ( ! element || ! hasClass( element, className ) ) {
 354              return;
 355          }
 356  
 357          if ( element.classList && element.classList.remove ) {
 358              element.classList.remove( className );
 359          } else {
 360              testName = ' ' + className + ' ';
 361              classes = ' ' + element.className + ' ';
 362  
 363              while ( classes.indexOf( testName ) > -1 ) {
 364                  classes = classes.replace( testName, '' );
 365              }
 366  
 367              element.className = classes.replace( /^[\s]+|[\s]+$/g, '' );
 368          }
 369      }
 370  
 371      /**
 372       * Remove hover class for all menu items.
 373       *
 374       * @since 5.3.1
 375       *
 376       * @param {NodeList} topMenuItems All menu items.
 377       */
 378  	function removeAllHoverClass( topMenuItems ) {
 379          if ( topMenuItems && topMenuItems.length ) {
 380              for ( var i = 0; i < topMenuItems.length; i++ ) {
 381                  removeClass( topMenuItems[i], 'hover' );
 382              }
 383          }
 384      }
 385  
 386      /**
 387       * Scrolls to the top of the page.
 388       *
 389       * @since 3.4.0
 390       *
 391       * @param {Event} event The Click event.
 392       *
 393       * @return {void}
 394       */
 395  	function scrollToTop( event ) {
 396          // Only scroll when clicking on the wpadminbar, not on menus or submenus.
 397          if (
 398              event.target &&
 399              event.target.id !== 'wpadminbar' &&
 400              event.target.id !== 'wp-admin-bar-top-secondary'
 401          ) {
 402              return;
 403          }
 404  
 405          try {
 406              window.scrollTo( {
 407                  top: -32,
 408                  left: 0,
 409                  behavior: 'smooth'
 410              } );
 411          } catch ( er ) {
 412              window.scrollTo( 0, -32 );
 413          }
 414      }
 415  
 416      /**
 417       * Get closest Element.
 418       *
 419       * @since 5.3.1
 420       *
 421       * @param {HTMLElement} el Element to get parent.
 422       * @param {string} selector CSS selector to match.
 423       */
 424  	function getClosest( el, selector ) {
 425          if ( ! window.Element.prototype.matches ) {
 426              // Polyfill from https://developer.mozilla.org/en-US/docs/Web/API/Element/matches.
 427              window.Element.prototype.matches =
 428                  window.Element.prototype.matchesSelector ||
 429                  window.Element.prototype.mozMatchesSelector ||
 430                  window.Element.prototype.msMatchesSelector ||
 431                  window.Element.prototype.oMatchesSelector ||
 432                  window.Element.prototype.webkitMatchesSelector ||
 433                  function( s ) {
 434                      var matches = ( this.document || this.ownerDocument ).querySelectorAll( s ),
 435                          i = matches.length;
 436  
 437                      while ( --i >= 0 && matches.item( i ) !== this ) { }
 438  
 439                      return i > -1;
 440                  };
 441          }
 442  
 443          // Get the closest matching elent.
 444          for ( ; el && el !== document; el = el.parentNode ) {
 445              if ( el.matches( selector ) ) {
 446                  return el;
 447              }
 448          }
 449  
 450          return null;
 451      }
 452  
 453  } )( document, window, navigator );


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