1$('#sel_users').select2().trigger('change');
2
3$(document).ready(function(){
4
5  // Initialize Select2
6  $('#sel_users').select2();
7
8  // Set option selected onchange
9  $('#user_selected').change(function(){
10    var value = $(this).val();
11
12    // Set selected 
13    $('#sel_users').val(value);
14    $('#sel_users').select2().trigger('change');
15
16  });
17});