Backbone Forms custom editor for Ajax Chosen select

gistfile1.js

/**
 * Creates an ajax-chosen instance
 * @see https://github.com/powmedia/ajax-chosen
 *
 * @param {String} options.schema.queryUrl         URL for ajax queries
 * @param {Function} options.schema.itemToString   Function that takes an item and returns how it should be displayed
 */
module.exports = Backbone.Form.editors.Select.extend({
  
  render: function() {
    Backbone.Form.editors.Select.prototype.render.call(this);

    var self = this,
        schema = this.options.schema,
        queryUrl = schema.queryUrl,
        itemToString = schema.itemToString;

    //Create the chosen instance
    function create() {
      self.$el.ajaxChosen({
        minLength: 1,
        queryLimit: 50,
        delay: 200,
        chosenOptions: {
          allow_single_deselect: false
        },
        searchingText: 'Searching...',
        noresultsText: 'No results found.',
        initialQuery: false
      }, function(options, response, event) {
        $.getJSON(queryUrl, { q: options.term }, function(data) {
          var options = {};

          _.each(data.items, function(item) {
            options[item.id] = itemToString(item);
          });

          response(options);
        });
      });
    }

    //Trigger chosen once the select has actually been added to the DOM
    setTimeout(create, 250);

    return this;
  }
    
});