public function add_action_handler(component_action $action, $id = null) {
        if (!$id) {
            $id = html_writer::random_id($action->event);
        }
        $this->page->requires->event_handler("#$id", $action->event, $action->jsfunction, $action->jsfunctionargs);
        return $id;
    }
public function add_action_handler(component_action $action, $id = null) {
        if (!$id) {
            $id = html_writer::random_id($action->event);
        }
        $this->page->requires->event_handler("#$id", $action->event, $action->jsfunction, $action->jsfunctionargs);
        return $id;
    }
public function add_action_handler ( component_action $ action , $ id = null ) { if ( ! $ id ) { $ id = html_writer :: random_id ( $ action -> event ) ; } $ this -> page -> requires -> event_handler ( "#$id" , $ action -> event , $ action -> jsfunction , $ action -> jsfunctionargs ) ; return $ id ; }
Adds a JS action for the element with the provided id.

This method adds a JS event for the provided component action to the page
and then returns the id that the event has been attached to.
If no id has been provided then a new ID is generated by {@link html_writer::random_id()}

@param component_action $action
@param string $id
@return string id of element, either original submitted or random new if not supplied
Adds a JS action for the element with the provided id .