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   1  /* global twentyseventeenScreenReaderText */
   2  (function( $ ) {
   3  
   4      // Variables and DOM Caching.
   5      var $body = $( 'body' ),
   6          $customHeader = $body.find( '.custom-header' ),
   7          $branding = $customHeader.find( '.site-branding' ),
   8          $navigation = $body.find( '.navigation-top' ),
   9          $navWrap = $navigation.find( '.wrap' ),
  10          $navMenuItem = $navigation.find( '.menu-item' ),
  11          $menuToggle = $navigation.find( '.menu-toggle' ),
  12          $menuScrollDown = $body.find( '.menu-scroll-down' ),
  13          $sidebar = $body.find( '#secondary' ),
  14          $entryContent = $body.find( '.entry-content' ),
  15          $formatQuote = $body.find( '.format-quote blockquote' ),
  16          isFrontPage = $body.hasClass( 'twentyseventeen-front-page' ) || $body.hasClass( 'home blog' ),
  17          navigationFixedClass = 'site-navigation-fixed',
  18          navigationHeight,
  19          navigationOuterHeight,
  20          navPadding,
  21          navMenuItemHeight,
  22          idealNavHeight,
  23          navIsNotTooTall,
  24          headerOffset,
  25          menuTop = 0,
  26          resizeTimer;
  27  
  28      // Ensure the sticky navigation doesn't cover current focused links.
  29      $( 'a[href], area[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, [tabindex], [contenteditable]', '.site-content-contain' ).filter( ':visible' ).on( 'focus', function() {
  30          if ( $navigation.hasClass( 'site-navigation-fixed' ) ) {
  31              var windowScrollTop = $( window ).scrollTop(),
  32                  fixedNavHeight = $navigation.height(),
  33                  itemScrollTop = $( this ).offset().top,
  34                  offsetDiff = itemScrollTop - windowScrollTop;
  35  
  36              // Account for Admin bar.
  37              if ( $( '#wpadminbar' ).length ) {
  38                  offsetDiff -= $( '#wpadminbar' ).height();
  39              }
  40  
  41              if ( offsetDiff < fixedNavHeight ) {
  42                  $( window ).scrollTo( itemScrollTop - ( fixedNavHeight + 50 ), 0 );
  43              }
  44          }
  45      });
  46  
  47      // Set properties of navigation.
  48  	function setNavProps() {
  49          navigationHeight      = $navigation.height();
  50          navigationOuterHeight = $navigation.outerHeight();
  51          navPadding            = parseFloat( $navWrap.css( 'padding-top' ) ) * 2;
  52          navMenuItemHeight     = $navMenuItem.outerHeight() * 2;
  53          idealNavHeight        = navPadding + navMenuItemHeight;
  54          navIsNotTooTall       = navigationHeight <= idealNavHeight;
  55      }
  56  
  57      // Make navigation 'stick'.
  58  	function adjustScrollClass() {
  59  
  60          // Make sure we're not on a mobile screen.
  61          if ( 'none' === $menuToggle.css( 'display' ) ) {
  62  
  63              // Make sure the nav isn't taller than two rows.
  64              if ( navIsNotTooTall ) {
  65  
  66                  // When there's a custom header image or video, the header offset includes the height of the navigation.
  67                  if ( isFrontPage && ( $body.hasClass( 'has-header-image' ) || $body.hasClass( 'has-header-video' ) ) ) {
  68                      headerOffset = $customHeader.innerHeight() - navigationOuterHeight;
  69                  } else {
  70                      headerOffset = $customHeader.innerHeight();
  71                  }
  72  
  73                  // If the scroll is more than the custom header, set the fixed class.
  74                  if ( $( window ).scrollTop() >= headerOffset ) {
  75                      $navigation.addClass( navigationFixedClass );
  76                  } else {
  77                      $navigation.removeClass( navigationFixedClass );
  78                  }
  79  
  80              } else {
  81  
  82                  // Remove 'fixed' class if nav is taller than two rows.
  83                  $navigation.removeClass( navigationFixedClass );
  84              }
  85          }
  86      }
  87  
  88      // Set margins of branding in header.
  89  	function adjustHeaderHeight() {
  90          if ( 'none' === $menuToggle.css( 'display' ) ) {
  91  
  92              // The margin should be applied to different elements on front-page or home vs interior pages.
  93              if ( isFrontPage ) {
  94                  $branding.css( 'margin-bottom', navigationOuterHeight );
  95              } else {
  96                  $customHeader.css( 'margin-bottom', navigationOuterHeight );
  97              }
  98  
  99          } else {
 100              $customHeader.css( 'margin-bottom', '0' );
 101              $branding.css( 'margin-bottom', '0' );
 102          }
 103      }
 104  
 105      // Set icon for quotes.
 106  	function setQuotesIcon() {
 107          $( twentyseventeenScreenReaderText.quote ).prependTo( $formatQuote );
 108      }
 109  
 110      // Add 'below-entry-meta' class to elements.
 111  	function belowEntryMetaClass( param ) {
 112          var sidebarPos, sidebarPosBottom;
 113  
 114          if ( ! $body.hasClass( 'has-sidebar' ) ||
 115              typeof $sidebar === 'undefined' ||
 116              $sidebar.length < 1 || (
 117              $body.hasClass( 'search' ) ||
 118              $body.hasClass( 'single-attachment' ) ||
 119              $body.hasClass( 'error404' ) ||
 120              $body.hasClass( 'twentyseventeen-front-page' )
 121          ) ) {
 122              return;
 123          }
 124  
 125          sidebarPos       = $sidebar.offset();
 126          sidebarPosBottom = sidebarPos.top + ( $sidebar.height() + 28 );
 127  
 128          $entryContent.find( param ).each( function() {
 129              var $element = $( this ),
 130                  elementPos = $element.offset(),
 131                  elementPosTop = elementPos.top;
 132  
 133              // Add 'below-entry-meta' to elements below the entry meta.
 134              if ( elementPosTop > sidebarPosBottom ) {
 135                  $element.addClass( 'below-entry-meta' );
 136              } else {
 137                  $element.removeClass( 'below-entry-meta' );
 138              }
 139          });
 140      }
 141  
 142      /*
 143       * Test if inline SVGs are supported.
 144       * @link https://github.com/Modernizr/Modernizr/
 145       */
 146  	function supportsInlineSVG() {
 147          var div = document.createElement( 'div' );
 148          div.innerHTML = '<svg/>';
 149          return 'http://www.w3.org/2000/svg' === ( 'undefined' !== typeof SVGRect && div.firstChild && div.firstChild.namespaceURI );
 150      }
 151  
 152      /**
 153       * Test if an iOS device.
 154      */
 155  	function checkiOS() {
 156          return /iPad|iPhone|iPod/.test(navigator.userAgent) && ! window.MSStream;
 157      }
 158  
 159      /*
 160       * Test if background-attachment: fixed is supported.
 161       * @link http://stackoverflow.com/questions/14115080/detect-support-for-background-attachment-fixed
 162       */
 163  	function supportsFixedBackground() {
 164          var el = document.createElement('div'),
 165              isSupported;
 166  
 167          try {
 168              if ( ! ( 'backgroundAttachment' in el.style ) || checkiOS() ) {
 169                  return false;
 170              }
 171              el.style.backgroundAttachment = 'fixed';
 172              isSupported = ( 'fixed' === el.style.backgroundAttachment );
 173              return isSupported;
 174          }
 175          catch (e) {
 176              return false;
 177          }
 178      }
 179  
 180      // Fire on document ready.
 181      $( function() {
 182  
 183          // If navigation menu is present on page, setNavProps and adjustScrollClass.
 184          if ( $navigation.length ) {
 185              setNavProps();
 186              adjustScrollClass();
 187          }
 188  
 189          // If 'Scroll Down' arrow in present on page, calculate scroll offset and bind an event handler to the click event.
 190          if ( $menuScrollDown.length ) {
 191  
 192              if ( $( 'body' ).hasClass( 'admin-bar' ) ) {
 193                  menuTop -= 32;
 194              }
 195              if ( $( 'body' ).hasClass( 'blog' ) ) {
 196                  menuTop -= 30; // The div for latest posts has no space above content, add some to account for this.
 197              }
 198              if ( ! $navigation.length ) {
 199                  navigationOuterHeight = 0;
 200              }
 201  
 202              $menuScrollDown.on( 'click', function( e ) {
 203                  e.preventDefault();
 204                  $( window ).scrollTo( '#primary', {
 205                      duration: 600,
 206                      offset: { top: menuTop - navigationOuterHeight }
 207                  });
 208              });
 209          }
 210  
 211          adjustHeaderHeight();
 212          setQuotesIcon();
 213          belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
 214          if ( true === supportsInlineSVG() ) {
 215              document.documentElement.className = document.documentElement.className.replace( /(\s*)no-svg(\s*)/, '$1svg$2' );
 216          }
 217  
 218          if ( true === supportsFixedBackground() ) {
 219              document.documentElement.className += ' background-fixed';
 220          }
 221      } );
 222  
 223      // If navigation menu is present on page, adjust it on scroll and screen resize.
 224      if ( $navigation.length ) {
 225  
 226          // On scroll, we want to stick/unstick the navigation.
 227          $( window ).on( 'scroll', function() {
 228              adjustScrollClass();
 229              adjustHeaderHeight();
 230          });
 231  
 232          // Also want to make sure the navigation is where it should be on resize.
 233          $( window ).on( 'resize', function() {
 234              setNavProps();
 235              setTimeout( adjustScrollClass, 500 );
 236          });
 237      }
 238  
 239      $( window ).on( 'resize', function() {
 240          clearTimeout( resizeTimer );
 241          resizeTimer = setTimeout( function() {
 242              belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
 243          }, 300 );
 244          setTimeout( adjustHeaderHeight, 1000 );
 245      });
 246  
 247      // Add header video class after the video is loaded.
 248      $( document ).on( 'wp-custom-header-video-loaded', function() {
 249          $body.addClass( 'has-header-video' );
 250      });
 251  
 252  })( jQuery );