An Ember.js TextField and that has been extended to react to a change event after a certain amount of time has passed without any other events having occurred within the TextField.

delayed_textfield_helper.js

App.DelayedTextField = Ember.TextField.extend({

  // FIXME
  // double check that init in Ember.TextSupport / Ember.TextSupport
  // isn't handling this.on("paste"...) and the internal variable is still
  // this._elementValueDidChange
  init: function() {
    this.on("propertychange", this, this._elementValueDidChange);
    this.on("keyup", this, this._elementValueDidChange);
    this.on("input", this, this._elementValueDidChange);
    this.on("paste", this, this._elementValueDidChange);
    this.on("change", this, this._elementValueDidChange);
    this._super();
    this.set("_previousValue", this.get('value'));
  },

  delay: (function() {
    var timer = 0;
    return function(callback, ms) {
      clearTimeout (timer);
      timer = setTimeout(callback, ms);
    };
  })(),

  valueDidChange: function() {
    var that = this;
    this.delay(function() {
      if (that.get('value') !== that.get('_previousValue')) {
        that.nowDoSomething();
      }
      that.set('_previousValue', that.get('value'));
    }, 800 );
  }.observes('value'),

  nowDoSomething: function () {
    // Now, Do Something
  }

});