wp-content/themes/twentysixteen/js/functions.js
/* global screenReaderText */
/**
* Theme functions file.
*
* Contains handlers for navigation and widget area.
*/
( function( $ ) {
var body, masthead, menuToggle, siteNavigation, socialNavigation, siteHeaderMenu, resizeTimer;
function initMainNavigation( container ) {
// Add dropdown toggle that displays child menu items.
var dropdownToggle = $( '<button />', {
'class': 'dropdown-toggle',
'aria-expanded': false
} ).append( $( '<span />', {
'class': 'screen-reader-text',
text: screenReaderText.expand
} ) );
container.find( '.menu-item-has-children > a' ).after( dropdownToggle );
// Toggle buttons and submenu items with active children menu items.
container.find( '.current-menu-ancestor > button' ).addClass( 'toggled-on' );
container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
// Add menu items with submenus to aria-haspopup="true".
container.find( '.menu-item-has-children' ).attr( 'aria-haspopup', 'true' );
container.find( '.dropdown-toggle' ).on( 'click', function( e ) {
var _this = $( this ),
screenReaderSpan = _this.find( '.screen-reader-text' );
e.preventDefault();
_this.toggleClass( 'toggled-on' );
_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
// jscs:disable
_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
// jscs:enable
screenReaderSpan.text( screenReaderSpan.text() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
} );
}
initMainNavigation( $( '.main-navigation' ) );
masthead = $( '#masthead' );
menuToggle = masthead.find( '#menu-toggle' );
siteHeaderMenu = masthead.find( '#site-header-menu' );
siteNavigation = masthead.find( '#site-navigation' );
socialNavigation = masthead.find( '#social-navigation' );
// Enable menuToggle.
( function() {
// Return early if menuToggle is missing.
if ( ! menuToggle.length ) {
return;
}
// Add an initial values for the attribute.
menuToggle.add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded', 'false' );
menuToggle.on( 'click.twentysixteen', function() {
$( this ).add( siteHeaderMenu ).toggleClass( 'toggled-on' );
// jscs:disable
$( this ).add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded', $( this ).add( siteNavigation ).add( socialNavigation ).attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
// jscs:enable
} );
} )();
// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.
( function() {
if ( ! siteNavigation.length || ! siteNavigation.children().length ) {
return;
}
// Toggle `focus` class to allow submenu access on tablets.
function toggleFocusClassTouchScreen() {
if ( window.innerWidth >= 910 ) {
$( document.body ).on( 'touchstart.twentysixteen', function( e ) {
if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {
$( '.main-navigation li' ).removeClass( 'focus' );
}
} );
siteNavigation.find( '.menu-item-has-children > a' ).on( 'touchstart.twentysixteen', function( e ) {
var el = $( this ).parent( 'li' );
if ( ! el.hasClass( 'focus' ) ) {
e.preventDefault();
el.toggleClass( 'focus' );
el.siblings( '.focus' ).removeClass( 'focus' );
}
} );
} else {
siteNavigation.find( '.menu-item-has-children > a' ).off( 'touchstart.twentysixteen' );
}
}
if ( 'ontouchstart' in window ) {
$( window ).on( 'resize.twentysixteen', toggleFocusClassTouchScreen );
toggleFocusClassTouchScreen();
}
siteNavigation.find( 'a' ).on( 'focus.twentysixteen blur.twentysixteen', function() {
$( this ).parents( '.menu-item' ).toggleClass( 'focus' );
} );
} )();
// Add the default ARIA attributes for the menu toggle and the navigations.
function onResizeARIA() {
if ( window.innerWidth < 910 ) {
if ( menuToggle.hasClass( 'toggled-on' ) ) {
menuToggle.attr( 'aria-expanded', 'true' );
} else {
menuToggle.attr( 'aria-expanded', 'false' );
}
if ( siteHeaderMenu.hasClass( 'toggled-on' ) ) {
siteNavigation.attr( 'aria-expanded', 'true' );
socialNavigation.attr( 'aria-expanded', 'true' );
} else {
siteNavigation.attr( 'aria-expanded', 'false' );
socialNavigation.attr( 'aria-expanded', 'false' );
}
menuToggle.attr( 'aria-controls', 'site-navigation social-navigation' );
} else {
menuToggle.removeAttr( 'aria-expanded' );
siteNavigation.removeAttr( 'aria-expanded' );
socialNavigation.removeAttr( 'aria-expanded' );
menuToggle.removeAttr( 'aria-controls' );
}
}
// Add 'below-entry-meta' class to elements.
function belowEntryMetaClass( param ) {
if ( body.hasClass( 'page' ) || body.hasClass( 'search' ) || body.hasClass( 'single-attachment' ) || body.hasClass( 'error404' ) ) {
return;
}
$( '.entry-content' ).find( param ).each( function() {
var element = $( this ),
elementPos = element.offset(),
elementPosTop = elementPos.top,
entryFooter = element.closest( 'article' ).find( '.entry-footer' ),
entryFooterPos = entryFooter.offset(),
entryFooterPosBottom = entryFooterPos.top + ( entryFooter.height() + 28 ),
caption = element.closest( 'figure' ),
figcaption = element.next( 'figcaption' ),
newImg;
// Add 'below-entry-meta' to elements below the entry meta.
if ( elementPosTop > entryFooterPosBottom ) {
// Check if full-size images and captions are larger than or equal to 840px.
if ( 'img.size-full' === param || '.wp-block-image img' === param ) {
// Create an image to find native image width of resized images (i.e. max-width: 100%).
newImg = new Image();
newImg.src = element.attr( 'src' );
$( newImg ).on( 'load.twentysixteen', function() {
if ( newImg.width >= 840 ) {
// Check if an image in an image block has a width attribute; if its value is less than 840, return.
if ( '.wp-block-image img' === param && element.is( '[width]' ) && element.attr( 'width' ) < 840 ) {
return;
}
element.addClass( 'below-entry-meta' );
if ( caption.hasClass( 'wp-caption' ) ) {
caption.addClass( 'below-entry-meta' );
caption.removeAttr( 'style' );
}
if ( figcaption ) {
figcaption.addClass( 'below-entry-meta' );
}
}
} );
} else {
element.addClass( 'below-entry-meta' );
}
} else {
element.removeClass( 'below-entry-meta' );
caption.removeClass( 'below-entry-meta' );
}
} );
}
$( function() {
body = $( document.body );
$( window )
.on( 'load.twentysixteen', onResizeARIA )
.on( 'resize.twentysixteen', function() {
clearTimeout( resizeTimer );
resizeTimer = setTimeout( function() {
belowEntryMetaClass( 'img.size-full' );
belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
belowEntryMetaClass( '.wp-block-image img' );
}, 300 );
onResizeARIA();
} );
belowEntryMetaClass( 'img.size-full' );
belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
belowEntryMetaClass( '.wp-block-image img' );
} );
} )( jQuery );