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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

目前为 2014-10-13 提交的版本。查看 最新版本。

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/5679/21043/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. }