public &FormState::getTriggeringElement()
Gets the form element that triggered submission.
array|null The form element that triggered submission, of NULL if there is none.
Overrides FormStateInterface::getTriggeringElement
public function &getTriggeringElement() { return $this->triggering_element; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/function/FormState::getTriggeringElement/8.1.x