Wait For Elements

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

目前為 2014-12-18 提交的版本，檢視最新版本。

此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/5679/28653/Wait%20For%20Elements.js

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Wrap lines

/**
* @param sel - the selector you want to wait for
* @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
* @param stopLooking - if true the function will stop looking for more elements after the first match
*/
function waitForElems(sel, action, stopLooking) {
  var id = 'fke' + Math.floor(Math.random() * 12345);
  function findElem(sel) {
    var found = [].filter.call(document.querySelectorAll(sel), function(elem) {
      return elem.dataset[id] !== 'y';
    });
    if(found.length > 0) {
      found.forEach(function(elem) {
        elem.dataset[id] = 'y';
        action(elem);
      });
      if(stopLooking) {
        clearInterval(tick);
      }
    }
  }
  var tick = setInterval(findElem.bind(null, sel), 300);
  findElem(sel);
  return tick;
}
/**
* @param regex - should match the site you're waiting for
* @param action - the callback that will be executed when a matching url is visited
* @param stopLooking - if true the function will stop waiting for another url match after the first match
*/
function waitForUrl(regex, action, stopLooking) {
  function checkUrl(regex) {
    var url = window.location.href;
    if(url !== lastUrl && regex.test(url)) {
      action();
    }
    if(stopLooking) {
      clearInterval(tick);
    }
    lastUrl = url;
  }
  var tick = setInterval(checkUrl.bind(null, regex), 300),
      lastUrl;
  checkUrl(regex);
  return tick;
}

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