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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