jQuery 中 ajaxSend() 和 ajaxStart() 函式的區別是什麼?
ajaxSend() 方法
ajaxSend(callback) 方法附加一個函式,該函式在傳送 AJAX 請求時執行。
以下是此方法使用到的所有引數的說明
- callback − 要執行的函式。XMLHttpRequest 和用於該請求的設定將作為引數傳遞給回撥函式。
假設我們在 result.html 檔案中具有以下 HTML 內容
<h1>THIS IS RESULT...</h1>
示例
以下示例顯示了此方法的用法
<html> <head> <title>The jQuery Example</title> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <script> $(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>
ajaxStart() 方法
ajaxStart(callback) 方法附加一個函式,該函式在開始 AJAX 請求且沒有其他活動請求時執行。
以下是此方法使用到的所有引數的說明:
- callback − 要執行的函式。
假設我們在 result.html 檔案中具有以下 HTML 內容
<h1>THIS IS RESULT...</h1>
示例
以下示例顯示了此方法的用法
<html> <head> <title>The jQuery Example</title> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script> $(document).ready(function() { /* Global variable */ var count = 0; $("#driver").click(function(event){ $('#stage1').load('result.html'); }); /* Gets called when request starts */ $(document).ajaxStart(function(){ count++; $("#stage2").html("<h1>Starts, Count :" + count + "</h1>"); }); /* Gets called when request complete */ $(document).ajaxComplete(function(event,request,set){ count++; $("#stage3").html("<h1>Completes,Count:" + count + "</h1>"); }); }); </script> </head> <body> <p>Click on the button to load result.html file:</p> <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>
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