jquery.delegate.js

(function() {

  function live(selector, context, event, data, handler){
    jQuery.each(event.split(/\s+/), function(){
      jQuery({length:0, selector:selector, context:context}).live(this.toString(), data, handler);
    });
  }

  function die(selector, context, event, handler){
    jQuery.each(event.split(/\s+/), function(){
      jQuery({length:0, selector:selector, context:context}).die(this.toString(), handler);
    });
  }

  // jQuery(context).delegate(selector, event, handler)
  // jQuery(context).delegate(selector, event, data, handler)
  // jQuery(context).delegate(selector, {event: handler})
  jQuery.fn.delegate = function(selector, event, data, handler){
    var context = this[0] || document;

    if (handler){
      live(selector, context, event, data, handler);
    }else{
      if (data){
        live(selector, context, event, undefined, data);
      }else{
        for (var e in event) live(selector, context, e, undefined, event[e]);
      }
    }

    return this;
  };

  // jQuery(context).undelegate(selector, event, handler)
  // jQuery(context).undelegate(selector, {event: handler})
  jQuery.fn.undelegate = function(selector, event, handler){
    var context = this[0] || document;

    if (handler){
      die(selector, context, event, handler);
    }else{
      for (var e in event) die(selector, context, e, event[e]);
    }

    return this;
  };

})();