jQuery ajaxSend(回调函数)方法

描述

ajaxSend(回调函数) 方法在每次发送AJAX请求时附加一个要执行的函数。这是一个Ajax事件。

语法

使用此方法的简单语法如下−

$(document).ajaxSend( callback )

参数

这是该方法使用的所有参数的描述：

callback − 要执行的函数。XMLHttpRequest和用于该请求的设置将作为参数传递给回调函数。

示例

假设在result.html文件中有以下HTML内容：

<h1>THIS IS RESULT...</h1>

以下是一个简单的示例，展示了该方法的使用方式。

<html>
   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript" 
         src = "https://www.tutorialspoint.com/jquery/jquery-3.6.0.js">
      </script>

      <script type = "text/javascript" language = "javascript">
         (document).ready(function() {

            /* Global variable */
            var count = 0;("#driver").click(function(event){
               ('#stage0').load('result.html');
            });

            /* Gets called when request starts */(document).ajaxStart(function(){
               count++;
               ("#stage1").html("<h1>Starts, Count :" + count + "</h1>");
            });

            /* Gets called when request is sent */(document).ajaxSend(function(evt, req, set){
               count++;
               ("#stage2").html("<h1>Sends, Count :" + count + "</h1>");("#stage2").append("<h1>URL :" + set.url  + "</h1>");
            });

            /* Gets called when request complete */
            (document).ajaxComplete(function(event,request,settings){
               count++;("#stage3").html("<h1>Completes, Count :" + count + "</h1>");
            });

         });
      </script>
   </head>

   <body>
      <p>Click on the button to load result.html file:</p>

      <div id = "stage0" style = "background-color:blue;">
         STAGE - 0
      </div>

      <div id = "stage1" style = "background-color:blue;">
         STAGE - 1
      </div>

      <div id = "stage2" style = "background-color:blue;">
         STAGE - 2
      </div>

      <div id = "stage3" style = "background-color:blue;">
         STAGE - 3
      </div>

      <input type = "button" id = "driver" value = "Load Data" />
   </body>
</html>