--- /dev/null
+/* 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();
+ 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 );
scripts.mit.edu / autoinstalls / wordpress.git / blobdiff