Phentermine For Sale, One thing missing from the Prototype Framework Class object is the ability to observe and fire events. Comprar en línea Phentermine, comprar Phentermine baratos, Even though classes do not allow one to observe an event on the class itself, there are still a couple of ways to handle observing and firing events within a class, cheap Phentermine. Buy Phentermine online no prescription, The first way is to create an option or property that can be fired:
var MyClass = Class.create({ initialize: function(options) { this.options = { onStarted: Prototype.emptyFunction }; Object.extend(this.options, options || {}); }, Phentermine schedule, Purchase Phentermine online, start: function() { this.options.onStarted(); }});
var temp = new MyClass({ onStarted: function() { alert('MyClass has started'); }});temp.start();
The big limitation of using this technique is you can only have one event handler for the event. What if you wanted to observe the onStarted event with multiple event handlers, taking Phentermine. Purchase Phentermine online no prescription, One way would be to fire an event on the document:
var MyClass = Class.create({ initialize: function(options) { this.options = { }; Object.extend(this.options, options || {}); }, Phentermine over the counter, Where can i find Phentermine online, start: function() { document.fire('myclass:started', { myclass: this }); }});
document .observe('myclass:started', Phentermine for sale, Generic Phentermine, function(e) { alert('First handler for myclass:started'); }) .observe('myclass:started', function(e) { alert('Second handler for myclass:started'); });
var temp = new MyClass();temp.start();
As you can see, online buy Phentermine without a prescription, Phentermine dangers, this allows us to observe the myclass:started with two different event handlers.
Now, what can we do if we want to observe an event on the MyClass instance, Phentermine For Sale.
To illustrate:
var temp = new MyClass();
temp.observe('myclass:started', Phentermine photos, Phentermine class, function(e){ alert('MyClass started');});
temp.start();
Notice how we are observing directly to the instance of MyClass. To allow MyClass to observe and fire events, Phentermine samples, Phentermine without a prescription, we need to mix-in our Proto.Observable module:
var MyClass = Class.create(Proto.Observable, { initialize: function(options) { this.options = { }; Object.extend(this.options, is Phentermine safe, Phentermine steet value, options || {}); },
start: function() { this.fire('myclass:started'); }});
There we go, discount Phentermine, Where can i order Phentermine without prescription, that's it. Now our class allows us to observe, japan, craiglist, ebay, overseas, paypal, Buy Phentermine from mexico, stopObserving and fire events directly on the MyClass instance.
Now let's look at how the Proto.Observable module works, buy Phentermine online cod. Phentermine For Sale, To get a better understanding what a mix-in module is, go to Prototype's tutorial on defining classes and inheritance. Where to buy Phentermine, There are three methods available in the Proto.Observable module: observe, stopObserving and fire, doses Phentermine work. Kjøpe Phentermine på nett, köpa Phentermine online, Let's look at the observe method:
observe: function(eventName, handler){ if (typeof this._observers == 'undefined') this._observers = $H();
if (typeof eventName == 'undefined') return this; if (typeof handler == 'undefined') return this;
if (typeof this._observers.get(eventName) != 'undefined') { if (this._observers.get(eventName).include(handler.toString())) return this; } else this._observers.set(eventName, where can i buy cheapest Phentermine online, Phentermine canada, mexico, india, $A());
this._observers.get(eventName).push(handler);
return this;}
The observe method does a few basic things. First, Phentermine dose, Buy cheap Phentermine no rx, every Proto.Observable class will contain a "private" variable _observers. The _observers is a Hash object that holds a list of the event names that are being observed on the class, Phentermine trusted pharmacy reviews. Each event name then contains an Array of event handlers, Phentermine For Sale. Order Phentermine no prescription, This way when the fire method is called, it will loop through each event handler for the specified event name, where can i buy Phentermine online. Real brand Phentermine online, Let's look at the fire method:
fire: function(eventName, memo){ if (typeof this._observers == 'undefined') this._observers = $H();
if (typeof eventName == 'undefined') return this; if (typeof this._observers.get(eventName) == 'undefined') return this;
var event; if (document.createEvent) { event = document.createEvent("HTMLEvents"); event.initEvent("dataavailable", true, true); } else { event = document.createEventObject(); event.eventType = "ondataavailable"; }
event.eventName = eventName; event.memo = memo || { };
this._observers.get(eventName).each(function(handler) { handler(event); });
return this;}
The fire method looks in the _observers Hash for the specified event name. If the event name isn't being observed, then we will simply return. If the event name is being observed, then we will want to create an event object and use that to pass in to each of the event handlers observing this event name.
Finally, the stopObserving method:
stopObserving: function(eventName, handler){ if (typeof this._observers == 'undefined') this._observers = $H();
if (typeof eventName == 'undefined') return this; if (typeof this._observers.get(eventName) == 'undefined') return this;
if (typeof handler == 'undefined') this._observers.get(eventName).clear(); else this._observers.set(eventName, this._observers.get(eventName).without(handler.toString()));
return this;}
The stopObserving method will do one of two things. If you stop observing an event name without specifying an event handler, then all event handlers for that event name will be removed. When an event handler is specified, then only that event handler will be removed.
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