change event dose not work

[dmyy2007]

datepicker is configed as follow
'clientEvents' => [
'change' => 'function () { alert('event "change" occured.'); }'
],
it doesnt work.

i find the 96 line code in the file yii2-jui\widget.php

            if (isset($this->clientEventMap[$event])) {
                $eventName = $this->clientEventMap[$event];
            } else {
                $eventName = strtolower($name . $event);
            }

will produce the js like the following:

          jQuery('#w1').on('datepickerchange', function () {....}

the event datepickerchange dose not exist.

change 96 line code to
$eventName = strtolower($event);
will work.

is this a bug or any other use ?

[cebe]

according to the jqueryUI docs the datepicker does not provide any events: http://api.jqueryui.com/datepicker/