GerritSiteFooter.html

<div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js" type="text/javascript" />
<script src="static/jquery.extensions.js" type="text/javascript" />
<script src="static/ui-modifications.js" type="text/javascript" />
</div>

ui-modifications.js

(function() {
  var hash_change_hooks = [];
  var document_ready_hooks = [];

  var currentHash = null;
  function updateGerritUI() {
    try {
      if (window.location.hash == currentHash) {
        return;
      }
      currentHash = window.location.hash;

      $.each(hash_change_hooks, function(i, hook) { hook(); });

    } catch (err) {
      currentHash = null;
    }
  }

  $(document).ready(function() {
    setInterval(updateGerritUI, 1000);
    $.each(document_ready_hooks, function(i, hook) { hook(); });
  });

  // SELENIUM BUTTON
  hash_change_hooks.push(function() {
   if (!(window.location.hash && window.location.hash.match(/^#change,/) &&
       $("span:contains('git fetch')").last().text().match(/canvas-lms/)))
     return;

   $("button:contains('Diff All')").parent().append(
       "<button type='button' tabindex='0' " +
       "class='gwt-Button selenium-trigger'>Trigger Selenium Test</button>");
  });
  
  document_ready_hooks.push(function() {
    $(".selenium-trigger").live('click', function() {
      var patchset = /refs\/changes\/(\d+\/\d+\/\d+) /.exec(
          $("span:contains('git fetch')").last().text())[1];
      var xsrfKey = $.cookie('GerritAccount');

      var matches = /^\d+\/(\d+)\/(\d+)$/.exec(patchset)
      var changeid = matches[1]
      var patchid = matches[2]

      var hudsonurl = "http://hudson/url/to/trigger/a/build/" + patchset;
      $.get(hudsonurl)
        .error(function(p1, p2, p3) {})
        .success(function() {})
        .complete(function() {
          $.ajax({
            type: 'POST',
            url: "/gerrit/rpc/PatchDetailService",
            data: $.toJSON({
              "jsonrpc": "2.0",
              "method": "publishComments",
              "params": [
                {
                  "changeId": {
                    "id": changeid
                  },
                  "patchSetId": patchid
                },
                "Selenium Build Triggered",
                []
              ],
              "xsrfKey": xsrfKey
            }),
            contentType: "application/json; charset=utf-8",
            dataType: 'json'
          })
            .error(function() {})
            .complete(function() {})
            .success(function() { window.location.reload(); })
        });
      // window.location = url;
    });
  });
})();