How to bind select to owl carousel 2?

Question

JavaScript

My code is https://jsfiddle.net/vfjrzr65/1/
I can't figure out why the select binding with the slider doesn't work.

When choosing the select option, everything works, that is, it is selected accordingly. slide.
But when you click on the slide, #sync2 .itemalas, the corresponding is not selected. option select.
Tell me why it doesn't work?

Answer 1

Can instead
add

$('#selectId option').prop('selected', false);
$('#selectId').multiselect('select', selected);
$('#selectId').multiselect('refresh');