Select2: How to prevent tags sorting

Question

When user selects many items (tags), they are automatically sorted alphabetically. How to prevent automatic sort and keep user\'s order using Select2 4.0?

Update:

Answer 1

This has been discussed before for Select2 3.5.2, you can use select2('data') to get the order.

$("select").select2();

$('#sayResult').click(function () {
  // 'data' brings the unordered list, while val does not
  var data = $('select').select2('data');
  
  // Push each item into an array
  var finalResult = data.map(function () {
    return this.id;
  });

  // Display the result with a comma
  alert( finalResult.join(',') );
});

<link href="//cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.js"></script>

<select style="width: 500px;" multiple="multiple">
  <option>two</option>
  <option>four</option>
  <option>six</option>
</select>

<button id='sayResult'>Say Result</button>

Answer 2

I've found a solution that works with Select2 v4. It changes the order of items - item selected by user are moved to the end.

$("select").select2();

$("select").on("select2:select", function (evt) {
  var element = evt.params.data.element;
  var $element = $(element);
  
  $element.detach();
  $(this).append($element);
  $(this).trigger("change");
});

<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css" rel="stylesheet"/>

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.js"></script>

<select style="width: 500px;" multiple="multiple">
  <option>two</option>
  <option>four</option>
  <option>six</option>
</select>

Update

The solution was found here: github.com/select2/select2/issues/3106. Its author is kevin-brown.

Answer 3

This solution works best

HTML

<select style="width: 500px;" multiple="multiple">
    <option>two</option>
    <option>four</option>
    <option>six</option>
  </select>

JS

$(document).ready( function () {

    $("select").select2({
      tags: true
    });
    
    $("select").on("select2:select", function (evt) {
      var element = evt.params.data.element;
      var $element = $(element);
      
      $element.detach();
      $(this).append($element);
      $(this).trigger("change");
    });

} );