Ember bind arrow keys

Ember arrow keys

App.Textfield = Ember.TextField.extend({

    init: function() {
      this._super();
      this.on("keyUp", this, this.interpretKeyEvents);
    },

    interpretKeyEvents: function(event){
      var map = TM.Textfield .KEY_EVENTS;
      var method = map[event.keyCode];
      if (method){
        return this[method](event);
      } else {
        this._super(event);
      }
    },

    arrowUp: function(event){
      this.sendAction('arrow-up', this, event);
    },

    arrowDown: function(event){
      this.sendAction('arrow-down', this, event);
    }

  });

  App.Textfield.KEY_EVENTS = {
    38: 'arrowUp',
    40: 'arrowDown'
  };