Prototype guide to the use of learning manuals ajax.js

Like many developers who used this class library before, I had to dive into reading Prototype.js's source code and experimenting with its functionality. Prototype in the Ajax.js provides a very useful AJAX framework, the general application of the simple call to the following code can be

new Ajax.Request(
　　url, {method: “get”,
　　onSuccess: showFilter,
　　onFailure: function(request){alert(”Server error!”)},
　　onException: showError}
);

The following objects and methods are provided in this framework:

Ajax object: There is only one Gettransport method that returns a XMLHttpRequest object, and another Activerequestcount property that reflects the number of Ajax currently being processed

Ajax.responders object: Inherits from Enumerable, manages the global Ajax request, has the following method:

Register (Responder): Registers an object that manages AJAX requests

Unregister (Responder): Undo an object that manages an AJAX request

Dispatch (callback, request, Transport, JSON): Methods to trigger registered processing objects

This object is rarely used, and the system already registers a processing object with the following code

Ajax.Responders.register({
　onCreate: function() {
　　Ajax.activeRequestCount++;
　},
　onComplete: function() {
　　Ajax.activeRequestCount–;
　}
});

Ajax.base class:

Ajax base class, only one method SetOptions (options), the default request parameter is as follows, you can specify when you create a new ajax.request:

method:'post’,
asynchronous: true,
contentType:'application/x-www-form-urlencoded’,
encoding:'UTF-8′,