In the following DOM event handling example (using jQuery):$('#shopping-cart').on('click', function(event){...});could I not call the shopping-cart DOM element the observable, and the function the observer? There is no general click event being hooked to, but a click event specific to the shopping-cart object itself.The javascript example of observable/observer example I'm operating from is the following (taken from here):// MyFancyObservable.jsvar util = require('util');  var EventEmitter = require('events').EventEmitter;function MyFancyObservable() {    EventEmitter.call(this);}util.inherits(MyFancyObservable, EventEmitter);MyFancyObservable.prototype.hello = function (name) {    this.emit('hello', name);};var MyFancyObservable = require('MyFancyObservable');  var observable = new MyFancyObservable();observable.on('hello', function (name) {    console.log(name);});observable.hello('john');  Notice that in the MyFancyObservable example, the on('hello', function) looks exactly like DOM event registration.
Can I call DOM event handling an instance of observable/observer pattern
design patterns;observer pattern;dom
The difference lies in the purpose of the Event.In your Shopping Cart example, the event gets fired in response to a user action.In an Observable, the event gets fired in response to a state change.Are they both examples of Event Handling? Yes.Are they both Observers?  No.