system/controls/formcontroltags.php

<?php

namespace Habari;

class FormControlTags extends FormControlText
{
  public static $outpre = false;

  public function pre_out()
  {
    $out = '';
    if ( !FormControlTextMulti::$outpre ) {
      FormControlTextMulti::$outpre = true;
      $out = <<< TAGS_PRE_OUT
<script type="text/javascript">
$(function(){
  $('input.tags_control').each(function(){

    for(var z in tc_tags=$(this).val().split(/\s*,\s*/)) {
      tc_tags[z]=tc_tags[z].replace(/^(["'])(.*)\1$/, '$2');
    }
    console.log(tc_tags);

    \$this = $(this);
    ajax_url = $(this).data('ajax_url');
    console.log(ajax_url);
    \$this.select2({
      tags: tc_tags,
      placeholder: "Tags",
      minimumInputLength: 1,
      ajax: {
        url: ajax_url,
        dataType: 'json',
        quietMillis: 100,
        data: function (term, page) {
          return { q: term };
        },
        results: function (data, page) {
          var results = {};
          for(var z in data.data) {
            results[parseInt(z)] = {id: parseInt(z), text: data.data[z]};
          }
          return {results: results, more: false};
        },
        formatSelection: function(item) {
          return item.text;
        },
        formatResult: function(item) {
          return item.text;
        }
      }
    });

  });
});
</script>
TAGS_PRE_OUT;
    }
    return $this->controls_js($out);
  }
}

?>