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Twenty Twelve: avoid JavaScript errors if navigation wrapper markup is removed from header. Fixes #22307.

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git-svn-id: https://develop.svn.wordpress.org/trunk@22574 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Lance Willett 2012-11-14 20:21:01 +00:00
parent 83d6afd2fb
commit 915b3eda40
1 changed files with 9 additions and 7 deletions
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16
wp-content/themes/twentytwelve/js/navigation.js
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@ -4,16 +4,18 @@
* Handles toggling the navigation menu for small screens.
*/
( function() {
var button = document.getElementById( 'site-navigation' ).getElementsByTagName( 'h3' )[0],
menu = document.getElementById( 'site-navigation' ).getElementsByTagName( 'ul' )[0];
if ( undefined === button )
return false;
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 ( undefined === menu || ! menu.childNodes.length ) {
if ( ! menu || ! menu.childNodes.length ) {
button.style.display = 'none';
return false;
return;
}
button.onclick = function() {