MediaWiki:Sysop.js

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 /** Import sysop-only CSS styles */
 importStylesheet('MediaWiki:Sysop.css');

 /** Creates a button to invert checkboxes on Special:Undelete */
 if (mw.config.get('wgCanonicalNamespace') == "Special" && mw.config.get('wgCanonicalSpecialPageName') == "Undelete") {
     (function () {
         var form             = document.forms["undelete"];
         if( !form ) {
             return;
         }
         var elements         = form.elements;
         var submitButton     = elements["mw-undelete-submit"];
         if( !submitButton ) {
             return;
         }
         var toggleButton     = document.createElement("input");
         toggleButton.type    = "button";
         toggleButton.value   = "Weçiner ters çerx ke";
         
         toggleButton.onclick = function () {
                 for( var i = 0; i < elements.length; ++i ) {
                     var input = elements[i];
                     if( input.type != "checkbox" ) {
                         continue;
                     }
                     input.checked = !input.checked;
                 }
             };
         submitButton.parentNode.insertBefore( toggleButton, submitButton );
     })();
 }