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Wait For Elements

given a selector waits for elements to be inserted into the DOM and executes a callback for each match

当前为 2014-10-22 提交的版本，查看 最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/5679/22195/Wait%20For%20Elements.js 

  1. /**
  2. * @param sel - the selector you want to wait for
  3. * @param action - the callback that will be executed when element/s matching the given selector are found, it is passed the array of found elements
  4. * @param stopLooking - if true the function will stop looking for more elements after the first match
  5. */
  6. function waitForElems(sel, action, stopLooking) {
  7.   var id = 'fke' + Math.floor(Math.random() * 12345);
  8.   function findElem(sel) {
  9.     var found = [].filter.call(document.querySelectorAll(sel), function(elem) {
  10.       return elem.dataset[id] !== 'y';
  11.     });
  12.     if(found.length > 0) {
  13.       found.forEach(function(elem) {
  14.         elem.dataset[id] = 'y';
  15.         action(elem);
  16.       });
  17.       if(stopLooking) {
  18.         clearInterval(tick);
  19.       }
  20.     }
  21.   }
  22.   var tick = setInterval(findElem.bind(null, sel), 300);
  23.   findElem(sel);
  24. }
  25. /**
  26. * @param regex - should match the site you're waiting for
  27. * @param action - the callback that will be executed when a matching url is visited
  28. * @param stopLooking - if true the function will stop waiting for another url match after the first match
  29. */
  30. function waitForUrl(regex, action, stopLooking) {
  31.   function checkUrl(regex) {
  32.     var url = window.location.href;
  33.     if(url !== lastUrl && regex.test(url)) {
  34.       action();
  35.     }
  36.     if(stopLooking) {
  37.       clearInterval(tick);
  38.     }
  39.     lastUrl = url;
  40.   }
  41.   var tick = setInterval(checkUrl.bind(null, regex), 300),
  42.       lastUrl;
  43.   checkUrl(regex);
  44. }