User:Mike.lifeguard/enhancedUndelete.js

 // Enhanced Undelete Tool
 // Stolen from Wikibooks created & Maintained by [[b:User:Darklama]] and [[b:User:Mike.lifeguard]]
 //
 // Adds a "Select All" and "Invert Selection" button to Special:Undelete. 
 // Used for administrators only.

 functionenhancedUndelete(){
 if(wgCanonicalSpecialPageName!="Undelete")
 return;
 varfi=document.getElementsByTagName("input");
 for(i=0;i<fi.length;i++){
 if(!fi[i].hasAttribute("type"))continue;
 if(fi[i].getAttribute("type")=="reset"){
 varsa=document.createElement("input");
 sa.setAttribute("type","button");
 sa.setAttribute("value","Select All");
 fi[i].parentNode.insertBefore(sa,fi[i].nextSibling);
 sa.onclick=function(){
 for(vari=0;i<fi.length;i++){
 if(fi[i].hasAttribute("type")&&fi[i].getAttribute("type")=="checkbox"){
 fi[i].checked=true;
 }
 }
 };

 // add invert selection button
 varinv=document.createElement("input");
 inv.setAttribute("type","button");
 inv.setAttribute("value","Invert All");
 fi[i].parentNode.insertBefore(inv,fi[i].nextSibling);
 inv.onclick=function(){
 // if a deleted edit is checked, uncheck it, and vis-versa.
 for(vari=0;i<fi.length;i++){
 if(fi[i].hasAttribute("type")&&fi[i].getAttribute("type")=="checkbox"){
 fi[i].checked=!fi[i].checked;
 }
 }
 }
 }
 elseif(fi[i].getAttribute("type")=="checkbox"){
 fi[i].checked=true;
 }
 }
 }

 if(wgCanonicalSpecialPageName=="Undelete")addOnloadHook(enhancedUndelete);