Bookmarklet to favorite tweets on a page with a frequency of 5 seconds.

twitter-favorite-loop.js

/*
 * Bookmarklet to favorite tweets on a page with a frequency of 5 seconds.
 *
 * Usage
 * =====
 * Copy the link "Favorite tweets" from http://jsfiddle.net/bfCnZ/1/ to your
 * toolbar and this will favorite items at a frequency of 5 seconds.
 */
(function() {

  var UNFAVORITED_COLOR = 'rgb(225,232, 237)';
  var PERIOD = 5 * 1000;

  /** Finds one unfavorited LI and clicks it. */
  function favoriteOne() {
    var li = findOneLi();
    if (li) {
      checkFavorite(li);
    }
  };

  /** Finds the first unfavorited LI. */
  function findOneLi() {
    var els = document.getElementsByTagName('li');
    for (var i = 0; i < els.length; i++) {
      var li = els[i];
      if (li.className == 'action-fav-container js-toggle-state js-toggle-fav') {
	return li;
      }
    }
    return null;
  }

  /** Checks the unfavorited LI. */
  function checkFavorite(li) {
    var spans = li.getElementsByTagName('span');
    if (spans.length != 2) {
      return;
    }
    var favoriteSpan = spans[0];
    var style = window.getComputedStyle(favoriteSpan);
    var color = String(style.color).replace(' ','');
    if (color == UNFAVORITED_COLOR) {
      click(favoriteSpan);
    }
  }

  /** Clicks the element. */
  function click(el) {
    var evt = document.createEvent('MouseEvents');
    evt.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0,
		       false, false, false, false, 0, null);
    el.dispatchEvent(evt);
  }

  function main() {
    setInterval(favoriteOne, PERIOD);
  }

  main();
})();