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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

Version vom 01.05.2016. Aktuellste Version

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/5679/122961/Wait%20For%20Elements.js 

/**
* @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 tick;
  var id = 'fke' + Math.floor(Math.random() * 12345);
  var type = window.MutationObserver ? 'M' : 'S';
  var lastMutation = Date.now();
  var lastCall = Date.now();
  var queuedCall;
  function throttle(func) {
    var now = Date.now();
    clearTimeout(queuedCall);
    // less than 100ms since last mutation
    if(now - lastMutation < 100) {
      // 500ms or more since last query
      Util.log(now - lastCall);
      if(now - lastCall >= 500) {
        func();
      } else {
        queuedCall = setTimeout(func, 100);
      }
    } else {
      func();
    }
    lastMutation = now;
  }
  function findElem(sel) {
    lastCall = Date.now();
    var found = [].filter.call(document.querySelectorAll(sel), function(elem) {
      return elem.dataset[id] !== 'y';
    });
    if(found.length > 0) {
      if(stopLooking) {
        type === 'M' ? tick.disconnect() : clearInterval(tick);
      }
      found.forEach(function(elem) {
        elem.dataset[id] = 'y';
        action(elem);
      });
    }
  }
  if(type === 'M') {
    tick = new MutationObserver(throttle.bind(null, findElem.bind(null, sel)));
    tick.observe(document.body, { subtree: true, childList: true });
  } else {
    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(urlTest) {
    var url = window.location.href;
    if(url !== lastUrl && urlTest(url)) {
      if(stopLooking) {
        clearInterval(tick);
      }
      lastUrl = url;
      action();
    }
    lastUrl = url;
  }
  var urlTest = (typeof regex === 'function' ? regex : regex.test.bind(regex)),
      tick = setInterval(checkUrl.bind(null, urlTest), 300),
      lastUrl;
  checkUrl(urlTest);
  return tick;
}