Initial commit

wp-content/themes/twentyseventeen/assets/js/global.js

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+/* global twentyseventeenScreenReaderText */
+(function( $ ) {
+
+	// Variables and DOM Caching.
+	var $body = $( 'body' ),
+		$customHeader = $body.find( '.custom-header' ),
+		$branding = $customHeader.find( '.site-branding' ),
+		$navigation = $body.find( '.navigation-top' ),
+		$navWrap = $navigation.find( '.wrap' ),
+		$navMenuItem = $navigation.find( '.menu-item' ),
+		$menuToggle = $navigation.find( '.menu-toggle' ),
+		$menuScrollDown = $body.find( '.menu-scroll-down' ),
+		$sidebar = $body.find( '#secondary' ),
+		$entryContent = $body.find( '.entry-content' ),
+		$formatQuote = $body.find( '.format-quote blockquote' ),
+		isFrontPage = $body.hasClass( 'twentyseventeen-front-page' ) || $body.hasClass( 'home blog' ),
+		navigationFixedClass = 'site-navigation-fixed',
+		navigationHeight,
+		navigationOuterHeight,
+		navPadding,
+		navMenuItemHeight,
+		idealNavHeight,
+		navIsNotTooTall,
+		headerOffset,
+		menuTop = 0,
+		resizeTimer;
+
+	// Ensure the sticky navigation doesn't cover current focused links.
+	$( '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' ).focus( function() {
+		if ( $navigation.hasClass( 'site-navigation-fixed' ) ) {
+			var windowScrollTop = $( window ).scrollTop(),
+				fixedNavHeight = $navigation.height(),
+				itemScrollTop = $( this ).offset().top,
+				offsetDiff = itemScrollTop - windowScrollTop;
+
+			// Account for Admin bar.
+			if ( $( '#wpadminbar' ).length ) {
+				offsetDiff -= $( '#wpadminbar' ).height();
+			}
+
+			if ( offsetDiff < fixedNavHeight ) {
+				$( window ).scrollTo( itemScrollTop - ( fixedNavHeight + 50 ), 0 );
+			}
+		}
+	});
+
+	// Set properties of navigation.
+	function setNavProps() {
+		navigationHeight      = $navigation.height();
+		navigationOuterHeight = $navigation.outerHeight();
+		navPadding            = parseFloat( $navWrap.css( 'padding-top' ) ) * 2;
+		navMenuItemHeight     = $navMenuItem.outerHeight() * 2;
+		idealNavHeight        = navPadding + navMenuItemHeight;
+		navIsNotTooTall       = navigationHeight <= idealNavHeight;
+	}
+
+	// Make navigation 'stick'.
+	function adjustScrollClass() {
+
+		// Make sure we're not on a mobile screen.
+		if ( 'none' === $menuToggle.css( 'display' ) ) {
+
+			// Make sure the nav isn't taller than two rows.
+			if ( navIsNotTooTall ) {
+
+				// When there's a custom header image or video, the header offset includes the height of the navigation.
+				if ( isFrontPage && ( $body.hasClass( 'has-header-image' ) || $body.hasClass( 'has-header-video' ) ) ) {
+					headerOffset = $customHeader.innerHeight() - navigationOuterHeight;
+				} else {
+					headerOffset = $customHeader.innerHeight();
+				}
+
+				// If the scroll is more than the custom header, set the fixed class.
+				if ( $( window ).scrollTop() >= headerOffset ) {
+					$navigation.addClass( navigationFixedClass );
+				} else {
+					$navigation.removeClass( navigationFixedClass );
+				}
+
+			} else {
+
+				// Remove 'fixed' class if nav is taller than two rows.
+				$navigation.removeClass( navigationFixedClass );
+			}
+		}
+	}
+
+	// Set margins of branding in header.
+	function adjustHeaderHeight() {
+		if ( 'none' === $menuToggle.css( 'display' ) ) {
+
+			// The margin should be applied to different elements on front-page or home vs interior pages.
+			if ( isFrontPage ) {
+				$branding.css( 'margin-bottom', navigationOuterHeight );
+			} else {
+				$customHeader.css( 'margin-bottom', navigationOuterHeight );
+			}
+
+		} else {
+			$customHeader.css( 'margin-bottom', '0' );
+			$branding.css( 'margin-bottom', '0' );
+		}
+	}
+
+	// Set icon for quotes.
+	function setQuotesIcon() {
+		$( twentyseventeenScreenReaderText.quote ).prependTo( $formatQuote );
+	}
+
+	// Add 'below-entry-meta' class to elements.
+	function belowEntryMetaClass( param ) {
+		var sidebarPos, sidebarPosBottom;
+
+		if ( ! $body.hasClass( 'has-sidebar' ) || (
+			$body.hasClass( 'search' ) ||
+			$body.hasClass( 'single-attachment' ) ||
+			$body.hasClass( 'error404' ) ||
+			$body.hasClass( 'twentyseventeen-front-page' )
+		) ) {
+			return;
+		}
+
+		sidebarPos       = $sidebar.offset();
+		sidebarPosBottom = sidebarPos.top + ( $sidebar.height() + 28 );
+
+		$entryContent.find( param ).each( function() {
+			var $element = $( this ),
+				elementPos = $element.offset(),
+				elementPosTop = elementPos.top;
+
+			// Add 'below-entry-meta' to elements below the entry meta.
+			if ( elementPosTop > sidebarPosBottom ) {
+				$element.addClass( 'below-entry-meta' );
+			} else {
+				$element.removeClass( 'below-entry-meta' );
+			}
+		});
+	}
+
+	/*
+	 * Test if inline SVGs are supported.
+	 * @link https://github.com/Modernizr/Modernizr/
+	 */
+	function supportsInlineSVG() {
+		var div = document.createElement( 'div' );
+		div.innerHTML = '<svg/>';
+		return 'http://www.w3.org/2000/svg' === ( 'undefined' !== typeof SVGRect && div.firstChild && div.firstChild.namespaceURI );
+	}
+
+	/**
+	 * Test if an iOS device.
+	*/
+	function checkiOS() {
+		return /iPad|iPhone|iPod/.test(navigator.userAgent) && ! window.MSStream;
+	}
+
+	/*
+	 * Test if background-attachment: fixed is supported.
+	 * @link http://stackoverflow.com/questions/14115080/detect-support-for-background-attachment-fixed
+	 */
+	function supportsFixedBackground() {
+		var el = document.createElement('div'),
+			isSupported;
+
+		try {
+			if ( ! ( 'backgroundAttachment' in el.style ) || checkiOS() ) {
+				return false;
+			}
+			el.style.backgroundAttachment = 'fixed';
+			isSupported = ( 'fixed' === el.style.backgroundAttachment );
+			return isSupported;
+		}
+		catch (e) {
+			return false;
+		}
+	}
+
+	// Fire on document ready.
+	$( document ).ready( function() {
+
+		// If navigation menu is present on page, setNavProps and adjustScrollClass.
+		if ( $navigation.length ) {
+			setNavProps();
+			adjustScrollClass();
+		}
+
+		// If 'Scroll Down' arrow in present on page, calculate scroll offset and bind an event handler to the click event.
+		if ( $menuScrollDown.length ) {
+
+			if ( $( 'body' ).hasClass( 'admin-bar' ) ) {
+				menuTop -= 32;
+			}
+			if ( $( 'body' ).hasClass( 'blog' ) ) {
+				menuTop -= 30; // The div for latest posts has no space above content, add some to account for this.
+			}
+			if ( ! $navigation.length ) {
+				navigationOuterHeight = 0;
+			}
+
+			$menuScrollDown.click( function( e ) {
+				e.preventDefault();
+				$( window ).scrollTo( '#primary', {
+					duration: 600,
+					offset: { top: menuTop - navigationOuterHeight }
+				});
+			});
+		}
+
+		adjustHeaderHeight();
+		setQuotesIcon();
+		belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
+		if ( true === supportsInlineSVG() ) {
+			document.documentElement.className = document.documentElement.className.replace( /(\s*)no-svg(\s*)/, '$1svg$2' );
+		}
+
+		if ( true === supportsFixedBackground() ) {
+			document.documentElement.className += ' background-fixed';
+		}
+	});
+
+	// If navigation menu is present on page, adjust it on scroll and screen resize.
+	if ( $navigation.length ) {
+
+		// On scroll, we want to stick/unstick the navigation.
+		$( window ).on( 'scroll', function() {
+			adjustScrollClass();
+			adjustHeaderHeight();
+		});
+
+		// Also want to make sure the navigation is where it should be on resize.
+		$( window ).resize( function() {
+			setNavProps();
+			setTimeout( adjustScrollClass, 500 );
+		});
+	}
+
+	$( window ).resize( function() {
+		clearTimeout( resizeTimer );
+		resizeTimer = setTimeout( function() {
+			belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
+		}, 300 );
+		setTimeout( adjustHeaderHeight, 1000 );
+	});
+
+	// Add header video class after the video is loaded.
+	$( document ).on( 'wp-custom-header-video-loaded', function() {
+		$body.addClass( 'has-header-video' );
+	});
+
+})( jQuery );