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HomeWeb Front-endJS TutorialJquery Ajax Learning Example 7 Ajax All Process Event Analysis Example_jquery

一、Ajax所有过程事件分析

   JQuery在执行Ajax的过程中会触发很多事件。
   这些事件可以分为两种事件,一种是局部事件(Local),一种是全局事件(Global)。
   局部事件:可以通过$.ajax来调用,你某一个Ajax请求不希望产生全局的事件,则可以设置global:false。
   全局事件:跟click等事件类似,可以绑定到到每一个DOM元素上。
   这些事件的按照事件的触发顺序如下介绍:

 

局部事件(Local) 全局事件(Global)
ajaxStart 全局事件
开始新的Ajax请求,并且此时没有其他ajax请求正在进行。
beforeSend 局部事件
当一个Ajax请求开始时触发。如果需要,你可以在这里设置XHR对象。
ajaxSend 全局事件
请求开始前触发的全局事件。
success 局部事件
请求成功时触发。即服务器没有返回错误,返回的数据也没有错误。
ajaxSuccess 全局事件
全局的请求成功。
error 局部事件
仅当发生错误时触发。你无法同时执行success和error两个回调函数。
ajaxError 全局事件
全局的发生错误时触发。
complete 局部事件
不管你请求成功还是失败,即便是同步请求,你都能在请求完成时触发这个事件。
ajaxComplete 全局事件
全局的请求完成时触发。
ajaxStop 全局事件
当没有Ajax正在进行中的时候,触发。
注:除了ajaxStart和ajaxStop之外,其他的事件都有3个参数
event, XMLHttpRequest, ajaxOptions
第一个是事件,第二个是XHR对象,第三个参数最有用,是当时调用这个ajax的时候的参数。
对于ajaxError,还有第四个参数thrownError,只有当异常发生时才会被传递。

 

二、Ajax所有过程事件示例

2.1、HTML代码

     

            
           

     

       

Result

      
Process

2.2、Jquery Ajax脚本 

局部事件(Local)实例 全局事件(Global)实例

  

 

 $.ready(function BtnGlobalClick() {
                $.get("http://www.jb51.net/windy2008/rss", {}, function(data, status, settings)

{
                    $("item", data).each(function(i, domEle) {
                        $("#Result").append("

" + $(domEle).children("title").text() + "
");
                                                                                             ($(this).text());
                          $(this).text("Start a new Ajax request"); $(this).text( "When no Ajax is in progress");
                   alert($(this).                                                                                                                                                                                     ;
                                $(this).                                                    ("#Process").ajaxSuccess (function() {
                                                                                                            $(this). $("#Process ").ajaxComplete(function() {
                                                                                                                                                                                                                  $("#Process").ajaxError(function() {
                                                                                                   );
       });
                                       
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