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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 2014-12-18 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/5679/28654/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.   return tick;
  25. }
  26. /**
  27. * @param regex - should match the site you're waiting for
  28. * @param action - the callback that will be executed when a matching url is visited
  29. * @param stopLooking - if true the function will stop waiting for another url match after the first match
  30. */
  31. function waitForUrl(regex, action, stopLooking) {
  32.   function checkUrl(regex) {
  33.     var url = window.location.href;
  34.     if(url !== lastUrl && regex.test(url)) {
  35.       lastUrl = url;
  36.       action();
  37.     }
  38.     if(stopLooking) {
  39.       clearInterval(tick);
  40.     }
  41.     lastUrl = url;
  42.   }
  43.   var tick = setInterval(checkUrl.bind(null, regex), 300),
  44.       lastUrl;
  45.   checkUrl(regex);
  46.   return tick;
  47. }