experimental Renren userscript to enable self-voting on the hui.renren.com/daren13 campaign for fun

NanNvShen_Self_Voting.user.js

// ==UserScript==
// @name        NanNvShen Self Voting
// @namespace   name.xen0n
// @description Enables self-voting on hui.renren.com/daren13 campaign.
// @include     http://hui.renren.com/daren13/user/profile*
// @version     1
// @grant       none
// @run-at      document-start
// ==/UserScript==

/*
// log helper
function log_d() {
  "use strict";

  if (console && console.log) {
    return console.log.apply(this, arguments);
  }
}
*/


// this mimics the mechanism described in profileWin.js of the app,
// to replace one help button's click event logic with the support button's.
var BTN_SUPPORT_ID = 'btn_support',
    BTN_LEVELUP_ID = 'btn_levelup'
    TITLE_INFO_EXPR = 'spotlight .info_in .ilblk a',
    APP_MODULE_FILE_RE = /profileWin\.js/,
    USER_ID_RE = /\?id=(\d+)$/,
    SCRIPT_HANDLER = function(e) {
      "use strict";

      // for external script:
      var src = e.target.src;
      // log_d(src);
      if (src.search(APP_MODULE_FILE_RE) != -1) {
        // log_d('manipulation started');

        var supportElem = document.getElementById(BTN_SUPPORT_ID),
            levelupElem = document.getElementById(BTN_LEVELUP_ID),
            titleElem = $(TITLE_INFO_EXPR);

        // log_d("support elem:", supportElem);
        // log_d("levelup elem:", levelupElem);
        // log_d("title elem:", titleElem);

        if (levelupElem !== null && supportElem === null) {
          // profile page of oneself, no #btn_support.
          // 开搞
          // first set ID to support button's
          // log_d("start processing");
          levelupElem.id = BTN_SUPPORT_ID;

          // then get full user name and user ID needed by the button's
          // click event listener
          // a. username
          levelupElem.dataset.username = titleElem.title;

          // b. userid
          var uidMatch = titleElem.href.match(USER_ID_RE);
          if (uidMatch !== null) {
            var uid = uidMatch[1];
            levelupElem.dataset.userid = uid;
          }
        }

        // only execute this piece of code once
        window.removeEventListener(e.type, SCRIPT_HANDLER, true);
      }
    };


// execute right before the main app module
// with help from http://userscripts.org/scripts/show/125936
window.addEventListener('beforescriptexecute', SCRIPT_HANDLER, true);


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