How to add a new options by user to Select2 dropdown

If you want to give user can add new options to select tag in runtime, you can use Select2 jQuery library to do it.

Final result is like this:

{: .img-responsive }

1. Enable tags option

$('select').select2({
  tags: true
});

2. Handle createTag function to add extra properties

$('select').select2({
  tags: true,
  createTag: function (params) {
    var term = $.trim(params.term);

    if (term === '') {
      return null;
    }

    return {
      id: term,
      text: term,
      newTag: true // add additional perameters
    }
  }
});

3. Update templateResult function to display "(new)" text inside of item

$('select').select2({
  tags: true,
  createTag: function (params) {
    var term = $.trim(params.term);

    if (term === '') {
      return null;
    }

    return {
      id: term,
      text: term,
      newTag: true // add additional perameters
    }
  },
  templateResult: function(data) {
    var $result = $("");

    $result.text(data.text);

    if (data.newTag) {
      $result.append(" (new)");
    }

    return $result;
  }
});

References

• https://select2.github.io/options.html
• https://stackoverflow.com/questions/14577014/select2-dropdown-but-allow-new-values-by-user/30021059#30021059