MediaWiki:Gadget-editzero.js

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/* Edit section zero caption button */
$( function() {
   var x;
   if (!(x = document.getElementById('ca-edit') )) return;
   var url;
   if (!(url = x.getElementsByTagName('a')[0] )) return;
   if (!(url = url.href )) return;
   var y = mw.util.addPortletLink('p-cactions', url+"&section=0", '0', 'ca-edit-0',
                          'Edit the lead section of this page', '0', x.nextSibling);
   y.className = x.className;  // steal classes from the the edit tab...
   x.className = 'istalk';     // ...and make the edit tab have no right margin
   // exception: don't steal the "selected" class unless actually editing section 0:
   if (/(^| )selected( |$)/.test(y.className)) {
       if (!document.editform || !document.editform.wpSection
           || document.editform.wpSection.value != "0") {
           y.className = y.className.replace(/(^| )selected( |$)/g, "$1");
           x.className += ' selected';
       }
   }
   y.style.marginLeft = '6px';
});