function DocumentElement::waitFor

File

core/tests/Drupal/Tests/DocumentElement.php, line 94

Class

DocumentElement

Document element.

Namespace

Code

public function waitFor($timeout, $callback) {
  // Wraps waits in a function to catch curl exceptions to continue waiting.
  WebDriverCurlService::disableRetry();
  $count = 0;
  $wrapper = function (Element $element) use ($callback, &$count) {
    $count++;
    try {
      return call_user_func($callback, $element);
    } catch (Exception $e) {
      return NULL;
    }
  };
  $result = parent::waitFor($timeout, $wrapper);
  if (!$result && $count < 2) {
    // If the callback or the system is really slow, then it might have only
    // fired once. In this case it is better to trigger it once more as the
    // page state has probably changed while the callback is running.
    return call_user_func($callback, $this);
  }
  WebDriverCurlService::enableRetry();
  return $result;
}