jQueryAjax事件汇总

Ajax请求会产生若干不同的事件，我们可以订阅这些事件并在其中处理我们的逻辑。在jQuery这里有两种Ajax事件：局部事件 和 全局事件。

局部事件就是在每次的Ajax请求时在方法内定义的，例如：

$.ajax({
            beforeSend: function(){
            // Handle the beforeSend event
            },
            complete: function(){
           // Handle the complete event
            }
            // ...
            });

全局事件是每次的Ajax请求都会触发的，它会向DOM中的所有元素广播，在上面 getScript() 示例中加载的脚本就是全局Ajax事件。全局事件可以如下定义：

$("#loading").bind("ajaxSend", function(){
            $(this).show();
            }).bind("ajaxComplete", function(){
            $(this).hide();
            });

或者：

$("#loading").ajaxStart(function(){
            $(this).show();
            });

我们可以在特定的请求将全局事件禁用，只要设置下 global 选项就可以了：

$.ajax({
            url: "test.html",
            global: false,// 禁用全局Ajax事件.
            // ...
            });

下面是jQuery官方给出的完整的Ajax事件列表：

·         ajaxStart(Global Event)
This event is broadcast if an Ajax request is started and no other Ajax requests are currently running.

·         beforeSend(Local Event)
This event, which is triggered before an Ajax request is started, allows you to modify the XMLHttpRequest object (setting additional headers, if need be.)

·         ajaxSend(Global Event)
This global event is also triggered before the request is run.

·         success(Local Event)
This event is only called if the request was successful (no errors from the server, no errors with the data).

·         ajaxSuccess(Global Event)
This event is also only called if the request was successful.

·         error(Local Event)
This event is only called if an error occurred with the request (you can never have both an error and a success callback with a request).

·         ajaxError(Global Event)
This global event behaves the same as the local error event.

·         complete(Local Event)
This event is called regardless of if the request was successful, or not. You will always receive a complete callback, even for synchronous requests.

·         ajaxComplete(Global Event)
This event behaves the same as the complete event and will be triggered every time an Ajax request finishes.

·         ajaxStop(Global Event)
This global event is triggered if there are no more Ajax requests being processed.

具体的全局事件请参考API文档。
好了，下面开始说jQuery里面功能最强的Ajax请求方法 $.ajax();