/** * navigation.js * * Handles toggling the navigation menu for small screens. */ ( function() { var nav = document.getElementById( site-navigation ), button, menu; if ( ! nav ) return; button = nav.getElementsByTagName( h3 )[0]; menu = nav.getElementsByTagName( ul )[0]; if ( ! button ) return; // Hide button if menu is missing or empty. if ( ! menu || ! menu.childNodes.length ) { button.style.display = none; return; } button.onclick = function() { if ( -1 == menu.className.indexOf( nav-menu ) ) menu.className = nav-menu; if ( -1 != button.className.indexOf( toggled-on ) ) { button.className = button.className.replace( toggled-on, ); menu.className = menu.className.replace( toggled-on, ); } else { button.className += toggled-on; menu.className += toggled-on; } }; } )();