前言：這次介紹的是利用ajax與後台進行數據交換的小例子，所以demo必須通過服務器來打開。服務器環境非常好搭建，從網上下載wamp或xampp，一步步安裝就ok，然後再把寫好的頁面放在服務器中指定的位置。打開時，在浏覽器地址欄輸入“localhost/指定頁面”或者“127.0.0.1/指定頁面”打開。
下面列出demo的HTML、PHP、原生ajax 、jq ajax代碼。
HTML代碼：
代碼如下:
<!doctype html>
<html>
<head>
<title>ajax示例</title>
<meta charset='utf-8' />
<link rel="stylesheet" type="text/css" href="css/common.css" />
<style type="text/css">
.main{height:400px;width:800px;margin:100px auto 0;border:1px solid #000;}
.list{height:400px;width:200px;float:left;background:#ddd;}
.inf{height:400px;width:600px;float:right;background:#ccc;text-align:center;}
.list li{width:200px;text-align:center;margin:50px 0 0;font-size:24px;cursor: pointer;
}
.inf img{width:360px;height:270px;margin:15px auto;}
.inf p{width:580px;text-align:left;text-indent:2em;font-size:14px;margin:0 10px;}
</style>
</head>
<body>
<div class='main'>
<div class='list' id='list'>
<ul>
<li name='spring' id='spring'>春</li>
<li name='summer' id='summer'>夏</li>
<li name='fall' id='fall'>秋</li>
<li name='winter' id='winter'>冬</li>
</ul>
</div>
<div class='inf' id='inf'>
<!--要插入的內容-->
</div>
</div>
</body>
<script type="text/javascript" charset="utf-8" src="js/jQuery.js"></script>
</html>
PHP代碼：
代碼如下:
<?php
$details = array (
'spring' => "<img src='images/spring.jpg' alt='' /><p>人間四月芳菲盡，山寺桃花始盛開</p>",
'summer' => "<img src='images/summer.jpg' alt='' /><p>水晶簾動微風起，滿架薔薇一院香</p>",
'fall' => "<img src='images/fall.jpg' alt='' /><p>金井梧桐秋葉黃，珠簾不卷夜來霜</p>",
'winter' => "<img src='images/winter.jpg' alt='' /><p>梅須遜雪三分白，雪卻輸梅一段香</p>"
);
echo $details[$_REQUEST['LiName']];
?>
原生ajax：
代碼如下:
<script type="text/javascript">
var lis = document.getElementById('list').getElementsByTagName('li');
window.onload = initPage;
function initPage() {
for (var i=0; i<lis.length; i++) {
txt = lis[i];
txt.onclick = function () {
getDetails(this.id);
}
}
}
function creatRequest() {
try {
request = new XMLHttpRequest();
}
catch (tryMS) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (otherMS) {
try {
request = new ActiveXObject("Miscrosoft.XMLHTTP");
}
catch (failed) {
request = null;
}
}
}
return request;
}
function getDetails(itemName) {
request = creatRequest();
if (request == null) {
alert('沒有成功創建請求')
return;
}
var url = "getDetails.php?LiName="+escape(itemName);
request.open("GET",url,true);
request.onreadystatechange = displayDetails;
request.send(null);
}
function displayDetails() {
if (request.readyState == 4) {
if (request.status == 200) {
detailDiv = document.getElementById("inf");
detailDiv.innerHTML = request.responseText;
}
}
}
</script>
JQ ajax:
代碼如下:
<script type="text/javascript">
$('#list li').click ( function () {
$.ajax({
type:'GET',
data:'',
url:"getDetails.php?LiName="+this.id,
success:function(data){
$('#inf').html(data);
},
dataType:'text',
error:function (){
alert("失敗！");
}
})
});
</script>