wp-content/themes/twentyfifteen/js/functions.js

   1 /* global screenReaderText */
   2 /**
   3  * Theme functions file.
   4  *
   5  * Contains handlers for navigation and widget area.
   6  */
   7
   8 ( function( $ ) {
   9         var $body, $window, $sidebar, adminbarOffset, top = false,
  10             bottom = false, windowWidth, windowHeight, lastWindowPos = 0,
  11             topOffset = 0, bodyHeight, sidebarHeight, resizeTimer;
  12
  13         // Add dropdown toggle that display child menu items.
  14         $( '.main-navigation .page_item_has_children > a, .main-navigation .menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
  15
  16         $( '.dropdown-toggle' ).click( function( e ) {
  17                 var _this = $( this );
  18                 e.preventDefault();
  19                 _this.toggleClass( 'toggle-on' );
  20                 _this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
  21                 _this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
  22                 _this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
  23         } );
  24
  25         // Enable menu toggle for small screens.
  26         ( function() {
  27                 var secondary = $( '#secondary' ), button, menu, widgets, social;
  28                 if ( ! secondary ) {
  29                         return;
  30                 }
  31
  32                 button = $( '.site-branding' ).find( '.secondary-toggle' );
  33                 if ( ! button ) {
  34                         return;
  35                 }
  36
  37                 // Hide button if there are no widgets and the menus are missing or empty.
  38                 menu    = secondary.find( '.nav-menu' );
  39                 widgets = secondary.find( '#widget-area' );
  40                 social  = secondary.find( '#social-navigation' );
  41                 if ( ! widgets.length && ! social.length && ( ! menu || ! menu.children().length ) ) {
  42                         button.hide();
  43                         return;
  44                 }
  45
  46                 button.on( 'click.twentyfifteen', function() {
  47                         secondary.toggleClass( 'toggled-on' );
  48                         secondary.trigger( 'resize' );
  49                         $( this ).toggleClass( 'toggled-on' );
  50                 } );
  51         } )();
  52
  53         // Sidebar scrolling.
  54         function resize() {
  55                 windowWidth   = $window.width();
  56                 windowHeight  = $window.height();
  57                 bodyHeight    = $body.height();
  58                 sidebarHeight = $sidebar.height();
  59
  60                 if ( 955 > windowWidth ) {
  61                         top = bottom = false;
  62                         $sidebar.removeAttr( 'style' );
  63                 }
  64         }
  65
  66         function scroll() {
  67                 var windowPos = $window.scrollTop();
  68
  69                 if ( 955 > windowWidth ) {
  70                         return;
  71                 }
  72
  73                 if ( sidebarHeight + adminbarOffset > windowHeight ) {
  74                         if ( windowPos > lastWindowPos ) {
  75                                 if ( top ) {
  76                                         top = false;
  77                                         topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
  78                                         $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
  79                                 } else if ( ! bottom && windowPos + windowHeight > sidebarHeight + $sidebar.offset().top && sidebarHeight + adminbarOffset < bodyHeight ) {
  80                                         bottom = true;
  81                                         $sidebar.attr( 'style', 'position: fixed; bottom: 0;' );
  82                                 }
  83                         } else if ( windowPos < lastWindowPos ) {
  84                                 if ( bottom ) {
  85                                         bottom = false;
  86                                         topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
  87                                         $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
  88                                 } else if ( ! top && windowPos + adminbarOffset < $sidebar.offset().top ) {
  89                                         top = true;
  90                                         $sidebar.attr( 'style', 'position: fixed;' );
  91                                 }
  92                         } else {
  93                                 top = bottom = false;
  94                                 topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
  95                                 $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
  96                         }
  97                 } else if ( ! top ) {
  98                         top = true;
  99                         $sidebar.attr( 'style', 'position: fixed;' );
 100                 }
 101
 102                 lastWindowPos = windowPos;
 103         }
 104
 105         function resizeAndScroll() {
 106                 resize();
 107                 scroll();
 108         }
 109
 110         $( document ).ready( function() {
 111                 $body          = $( document.body );
 112                 $window        = $( window );
 113                 $sidebar       = $( '#sidebar' ).first();
 114                 adminbarOffset = $body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;
 115
 116                 $window
 117                         .on( 'scroll.twentyfifteen', scroll )
 118                         .on( 'resize.twentyfifteen', function() {
 119                                 clearTimeout( resizeTimer );
 120                                 resizeTimer = setTimeout( resizeAndScroll, 500 );
 121                         } );
 122                 $sidebar.on( 'click keydown', 'button', resizeAndScroll );
 123
 124                 resizeAndScroll();
 125
 126                 for ( var i = 1; i < 6; i++ ) {
 127                         setTimeout( resizeAndScroll, 100 * i );
 128                 }
 129         } );
 130
 131 } )( jQuery );