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Observer-Pattern in JavaScript

/ Published in: JavaScript
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Could be improved by passing an event instead of a simple payload.

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  1. /** origin: http://blog.rvi-media.de/javascript/observer-in-javascript/
  2.  */  
  3. var Observer = function() {
  4. 	this.listeners = [];
  5. 	this.add = function(callback) {
  6. 		this.listeners.push(callback);
  7. 	};
  8. 	this.remove = function(callback) {
  9. 		/* TODO! ;) */
  10. 	};
  11. 	this.update = function(payload) {
  12. 		for (i in this.listeners)
  13. 			this.listeners[i](payload);
  14. 	};
  15. };
  16.  
  17. var o = new Observer();
  18. o.add(function(payload){document.writeln(payload);});
  19. o.add(function(payload){alert(payload);});
  20. o.update('foo');
  21. o.update('bar');

URL: http://blog.rvi-media.de/javascript/observer-in-javascript/

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