https://www.pensions-institute.org/wp-content/themes/twentyfifteen/js/functions.js?ver=20171218

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, resizeTimer,
10		secondary, button;
11
12	function initMainNavigation( container ) {
13		// Add dropdown toggle that display child menu items.
14		container.find( '.menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
15
16		// Toggle buttons and submenu items with active children menu items.
17		container.find( '.current-menu-ancestor > button' ).addClass( 'toggle-on' );
18		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
19
20		container.find( '.dropdown-toggle' ).on( 'click', function( e ) {
21			var _this = $( this );
22			e.preventDefault();
23			_this.toggleClass( 'toggle-on' );
24			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
25			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
26			_this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
27		} );
28	}
29	initMainNavigation( $( '.main-navigation' ) );
30
31	// Re-initialize the main navigation when it is updated, persisting any existing submenu expanded states.
32	$( document ).on( 'customize-preview-menu-refreshed', function( e, params ) {
33		if ( 'primary' === params.wpNavMenuArgs.theme_location ) {
34			initMainNavigation( params.newContainer );
35
36			// Re-sync expanded states from oldContainer.
37			params.oldContainer.find( '.dropdown-toggle.toggle-on' ).each(function() {
38				var containerId = $( this ).parent().prop( 'id' );
39				$( params.newContainer ).find( '#' + containerId + ' > .dropdown-toggle' ).triggerHandler( 'click' );
40			});
41		}
42	});
43
44	secondary = $( '#secondary' );
45	button = $( '.site-branding' ).find( '.secondary-toggle' );
46
47	// Enable menu toggle for small screens.
48	( function() {
49		var menu, widgets, social;
50		if ( ! secondary.length || ! button.length ) {
51			return;
52		}
53
54		// Hide button if there are no widgets and the menus are missing or empty.
55		menu    = secondary.find( '.nav-menu' );
56		widgets = secondary.find( '#widget-area' );
57		social  = secondary.find( '#social-navigation' );
58		if ( ! widgets.length && ! social.length && ( ! menu.length || ! menu.children().length ) ) {
59			button.hide();
60			return;
61		}
62
63		button.on( 'click.twentyfifteen', function() {
64			secondary.toggleClass( 'toggled-on' );
65			secondary.trigger( 'resize' );
66			$( this ).toggleClass( 'toggled-on' );
67			if ( $( this, secondary ).hasClass( 'toggled-on' ) ) {
68				$( this ).attr( 'aria-expanded', 'true' );
69				secondary.attr( 'aria-expanded', 'true' );
70			} else {
71				$( this ).attr( 'aria-expanded', 'false' );
72				secondary.attr( 'aria-expanded', 'false' );
73			}
74		} );
75	} )();
76
77	/**
78	 * Add or remove ARIA attributes.
79	 *
80	 * Uses jQuery's width() function to determine the size of the window and add
81	 * the default ARIA attributes for the menu toggle if it's visible.
82	 *
83	 * @since Twenty Fifteen 1.1
84	 */
85	function onResizeARIA() {
86		if ( 955 > $window.width() ) {
87			button.attr( 'aria-expanded', 'false' );
88			secondary.attr( 'aria-expanded', 'false' );
89			button.attr( 'aria-controls', 'secondary' );
90		} else {
91			button.removeAttr( 'aria-expanded' );
92			secondary.removeAttr( 'aria-expanded' );
93			button.removeAttr( 'aria-controls' );
94		}
95	}
96
97	// Sidebar scrolling.
98	function resizeAndScroll() {
99		var windowPos = $window.scrollTop(),
100			windowHeight = $window.height(),
101			sidebarHeight = $sidebar.height(),
102			bodyHeight = $body.height();
103
104		if( 955 < $window.width() && bodyHeight > sidebarHeight && ( windowPos + windowHeight ) >= sidebarHeight ) {
105			$sidebar.css({
106				position: 'fixed',
107				bottom: sidebarHeight > windowHeight ? 0 : 'auto'
108			});
109		} else {
110			$sidebar.css('position', 'relative');
111		}
112	}
113
114	$( function() {
115		$body          = $( document.body );
116		$window        = $( window );
117		$sidebar       = $( '#sidebar' ).first();
118
119		$window
120			.on( 'scroll.twentyfifteen', resizeAndScroll )
121			.on( 'load.twentyfifteen', onResizeARIA )
122			.on( 'resize.twentyfifteen', function() {
123				clearTimeout( resizeTimer );
124				resizeTimer = setTimeout( resizeAndScroll, 500 );
125				onResizeARIA();
126			} );
127		$sidebar.on( 'click.twentyfifteen keydown.twentyfifteen', 'button', resizeAndScroll );
128
129		for ( var i = 0; i < 6; i++ ) {
130			setTimeout( resizeAndScroll, 100 * i );
131		}
132	} );
133
134} )( jQuery );