User:Superm401/Compare link.js

From Wikipedia, the free encyclopedia

Note: After saving, you have to bypass your browser's cache to see the changes. In Internet Explorer and Firefox, hold down the Ctrl key and click the Refresh or Reload button. Opera users have to clear their caches through Tools→Preferences, see the instructions for Opera. Konqueror and Safari users can just click the Reload button. 

//<pre>
// Compare link
/* In addition to the GFDL:
 
This function (compare link) is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This function is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
A copy of the GPL is available at http://www.prism.gatech.edu/~mflaschen3/gpl.txt .
 
By modifying "Wikipedia:WikiProject User scripts/Scripts/Compare link":
You agree to dual-license your contributions under both the GFDL (http://en.wikipedia.org/wiki/WP:GFDL)
and version 2 of the GPL (http://www.prism.gatech.edu/~mflaschen3/gpl.txt) or any later version
of the GPL published by the FSF.
 
*/
function fixCompare()
{
  var histForm=document.getElementsByTagName("form")[0];
  var finalButton=document.getElementById("historysubmit");
  if(!finalButton || finalButton == null)
    return;
 
  var firstButton=histForm.getElementsByTagName("input")[1];
  histForm.removeChild(finalButton);
  histForm.removeChild(firstButton);
  var compareLink=document.createElement("a");
  var genLink = wgServer + wgScript + "?title=" + histForm.title.value + "&diff=" + histForm.diff[0].value + "&oldid=" + histForm.oldid[1].value;
  compareLink.setAttribute("href", genLink);
  compareLink.appendChild(document.createTextNode("Compare selected versions"));
  histForm.insertBefore(compareLink, document.getElementById("pagehistory"));
  var endLink=compareLink.cloneNode(true);
  histForm.appendChild(endLink);
  var diffList=document.getElementById("pagehistory");
  diffList.setAttribute("onchange", "updateCompare()");
}
function updateCompare()
{
  var histForm=document.getElementsByTagName("form")[0];
  var diffList=document.getElementById("pagehistory");
  var compareLink=diffList.previousSibling;
  var endLink=diffList.nextSibling;
  var oldInd=-1;
  var i=0;
  while(oldInd==-1 & i<histForm.oldid.length)
  {
    if(histForm.oldid[i].checked)
      oldInd=i;
    i++;
  }
  var diffInd=-1;
  var j=0;
  while(diffInd==-1 & j<histForm.diff.length)
  {
    if(histForm.diff[j].checked)
      diffInd=j;
    j++;
  }
var genLink = wgServer + wgScript + "?title=" + histForm.title.value + "&diff=" + histForm.diff[diffInd].value + "&oldid=" + histForm.oldid[oldInd].value;
  compareLink.setAttribute("href", genLink);
  endLink.setAttribute("href", genLink);
}
if(window.location.href.indexOf("action=history")!=-1)
addOnloadHook(fixCompare);
//</pre>