Backbone Model fetch error, success and complete events

gistfile1.js

var ItemModel = Backbone.Model.extend({

  // emit fetch:error, fetch:success, fetch:complete, and fetch:start events
  fetch: function(options) {
    var _this = this;
    
    options = options || {};

    var error = options.error;
    var success = options.success;
    var complete = options.complete;

    options.error = function(xhr, textStatus, errorThrown) {
      _this.trigger('fetch:error');
      if (error) error(xhr, textStatus, errorThrown);
    };

    options.success = function(resp) {
      _this.trigger('fetch:success');
      if (success) success.call(options.context, resp);
    };

    options.complete = function() {
      _this.trigger('fetch:complete');
      if (complete) complete();
    };

    _this.trigger('fetch:start');

    return Backbone.Model.prototype.fetch.call(this, options);
  }
});