ajaxSend（callback ）

优质

小牛编辑

134浏览

2023-12-01

描述 (Description)

无论何时发送AJAX请求， ajaxSend( callback )方法都会附加一个要执行的函数。这是一个Ajax事件。

语法 (Syntax)

以下是使用此方法的简单语法 -

<i>$(document)</i>.ajaxSend( callback )

参数 (Parameters)

以下是此方法使用的所有参数的说明 -

callback - 要执行的函数。用于该请求的XMLHttpRequest和设置作为参数传递给回调。

例子 (Example)

假设我们在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，简单地显示了此方法的用法。

<html>
   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript" 
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.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>