`onenter` event in Backbone.View

backbone.onenter.js

/*
 * Implements 'onenter' event for `events` object in Backbone.View.
 * Author: Emil Stenqvist <emsten@gmail.com>
 */
(function(global) {

  var Backbone = global.Backbone;
  if(!Backbone) throw "this shim needs Backbone";

  var delegateEvents = Backbone.View.prototype.delegateEvents;
      delegateEventSplitter = /^(\S+)\s*(.*)$/,
      replaceWithEvent = 'keypress';

  var filterFn = function(fn, ev) {
    if(ev && ev.keyCode === 13) return fn.call(this, ev);
  };

  Backbone.View.prototype.delegateEvents = function(events) {
    events = events || this['events'];
    if(!events) return;
    var _events = events;

    // Plugin works by identifying `onenter` events and overriding them with a
    // `keypress` event with the same selector but a filtering callback that
    // checks for the ENTER keycode before calling the real callback.
    for(var key in events) {
      var match = key.match(delegateEventSplitter),
          eventName = match[1], selector = match[2];

      if(eventName === 'onenter') {
        var method = events[key];
        if (!_.isFunction(method)) method = this[method];
        _events[replaceWithEvent + ' ' + match[2]] = _.bind(filterFn, this, method);
        delete _events[key];
      }
    }

    return delegateEvents.call(this, _events);
  };

}).call(this, this);