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/** |
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* File navigation.js. |
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* |
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* Handles toggling the navigation menu for small screens and enables TAB key |
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* navigation support for dropdown menus. |
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*/ |
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( function() { |
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var container, button, menu, links, i, len; |
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container = document.getElementById( 'site-navigation' ); |
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if ( ! container ) { |
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return; |
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} |
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button = container.getElementsByTagName( 'button' )[0]; |
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if ( 'undefined' === typeof button ) { |
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return; |
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} |
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menu = container.getElementsByTagName( 'ul' )[0]; |
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// Hide menu toggle button if menu is empty and return early. |
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if ( 'undefined' === typeof menu ) { |
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button.style.display = 'none'; |
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return; |
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} |
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menu.setAttribute( 'aria-expanded', 'false' ); |
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if ( -1 === menu.className.indexOf( 'nav-menu' ) ) { |
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menu.className += ' nav-menu'; |
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} |
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button.onclick = function() { |
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if ( -1 !== container.className.indexOf( 'toggled' ) ) { |
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container.className = container.className.replace( ' toggled', '' ); |
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button.setAttribute( 'aria-expanded', 'false' ); |
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menu.setAttribute( 'aria-expanded', 'false' ); |
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} else { |
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container.className += ' toggled'; |
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button.setAttribute( 'aria-expanded', 'true' ); |
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menu.setAttribute( 'aria-expanded', 'true' ); |
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} |
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}; |
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// Get all the link elements within the menu. |
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links = menu.getElementsByTagName( 'a' ); |
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// Each time a menu link is focused or blurred, toggle focus. |
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for ( i = 0, len = links.length; i < len; i++ ) { |
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links[i].addEventListener( 'focus', toggleFocus, true ); |
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links[i].addEventListener( 'blur', toggleFocus, true ); |
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} |
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/** |
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* Sets or removes .focus class on an element. |
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*/ |
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function toggleFocus() { |
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var self = this; |
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// Move up through the ancestors of the current link until we hit .nav-menu. |
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while ( -1 === self.className.indexOf( 'nav-menu' ) ) { |
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// On li elements toggle the class .focus. |
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if ( 'li' === self.tagName.toLowerCase() ) { |
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if ( -1 !== self.className.indexOf( 'focus' ) ) { |
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self.className = self.className.replace( ' focus', '' ); |
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} else { |
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self.className += ' focus'; |
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} |
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} |
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self = self.parentElement; |
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} |
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} |
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/** |
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* Toggles `focus` class to allow submenu access on tablets. |
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*/ |
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( function( container ) { |
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var touchStartFn, i, |
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parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' ); |
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if ( 'ontouchstart' in window ) { |
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touchStartFn = function( e ) { |
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var menuItem = this.parentNode, i; |
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if ( ! menuItem.classList.contains( 'focus' ) ) { |
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e.preventDefault(); |
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for ( i = 0; i < menuItem.parentNode.children.length; ++i ) { |
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if ( menuItem === menuItem.parentNode.children[i] ) { |
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continue; |
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} |
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menuItem.parentNode.children[i].classList.remove( 'focus' ); |
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} |
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menuItem.classList.add( 'focus' ); |
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} else { |
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menuItem.classList.remove( 'focus' ); |
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} |
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}; |
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for ( i = 0; i < parentLink.length; ++i ) { |
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parentLink[i].addEventListener( 'touchstart', touchStartFn, false ); |
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} |
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} |
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}( container ) ); |
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} )(); |
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Tan-007 /
DesignFly
