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/** | |
* navigation.js | |
* | |
* Handles toggling the navigation menu for small screens and enables tab | |
* support for dropdown menus. | |
*/ | |
( function() { | |
var container, button, menu, body, links, subMenus; | |
container = document.getElementById( 'site-navigation' ); | |
if ( ! container ) { | |
return; | |
} | |
button = container.getElementsByTagName( 'button' )[0]; | |
if ( 'undefined' === typeof button ) { | |
return; | |
} | |
menu = container.getElementsByTagName( 'ul' )[0]; | |
body = document.getElementsByTagName( 'body' )[0]; | |
// Hide menu toggle button if menu is empty and return early. | |
if ( 'undefined' === typeof menu ) { | |
button.style.display = 'none'; | |
return; | |
} | |
menu.setAttribute( 'aria-expanded', 'false' ); | |
if ( -1 === menu.className.indexOf( 'nav-menu' ) ) { | |
menu.className += ' nav-menu'; | |
} | |
button.onclick = function() { | |
if ( -1 !== container.className.indexOf( 'toggled' ) ) { | |
container.className = container.className.replace( ' toggled', '' ); | |
button.setAttribute( 'aria-expanded', 'false' ); | |
menu.setAttribute( 'aria-expanded', 'false' ); | |
body.removeClass('menu-toggled'); | |
} else { | |
container.className += ' toggled'; | |
button.setAttribute( 'aria-expanded', 'true' ); | |
menu.setAttribute( 'aria-expanded', 'true' ); | |
body.addClass('menu-toggled'); | |
} | |
}; | |
// Get all the link elements within the menu. | |
links = menu.getElementsByTagName( 'a' ); | |
subMenus = menu.getElementsByTagName( 'ul' ); | |
// Set menu items with submenus to aria-haspopup="true". | |
for ( var i = 0, len = subMenus.length; i < len; i++ ) { | |
subMenus[i].parentNode.setAttribute( 'aria-haspopup', 'true' ); | |
} | |
// Each time a menu link is focused or blurred, toggle focus. | |
for ( i = 0, len = links.length; i < len; i++ ) { | |
links[i].addEventListener( 'focus', toggleFocus, true ); | |
links[i].addEventListener( 'blur', toggleFocus, true ); | |
} | |
/** | |
* Sets or removes .focus class on an element. | |
*/ | |
function toggleFocus() { | |
var self = this; | |
// Move up through the ancestors of the current link until we hit .nav-menu. | |
while ( -1 === self.className.indexOf( 'nav-menu' ) ) { | |
// On li elements toggle the class .focus. | |
if ( 'li' === self.tagName.toLowerCase() ) { | |
if ( -1 !== self.className.indexOf( 'focus' ) ) { | |
self.className = self.className.replace( ' focus', '' ); | |
} else { | |
self.className += ' focus'; | |
} | |
} | |
self = self.parentElement; | |
} | |
} | |
} )(); |
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