摘要:ajax基本範例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文件</title>
</head>
<body>
<script>
function creatRequestObj(){
var request = null;
try {
//IE7,or non-IE browser
request = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
//IE browser
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
//other IE browser
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
//not support
request = null;
}
}
}
return request;
}
//create XMLHttpRequest Object
var request = null;
request = creatRequestObj();
if (request == null){
//無法取得XMLHttpRequest物件時發出警告
alert("Error creating request object!");
}
//Send data to Server
function sendData() {
var url = "ajax.php";
request.open("GET", url, true);//開啟連線，選擇連線方式GET,POST
request.onreadystatechange = updatePage;//狀態完成時所要執行的函式
request.send(null);//送出
}
function updatePage() {
if (request.readyState == 4) {//完成狀態有好幾種，4代表資料傳回完成
var data = request.responseText;//取得傳回的資料存在變數中
//更新文字框中的值
var txt = document.getElementById("data");
txt.value = data;
//以下的部份會把html中id為show的元素清除，然後再加入資料
var el = document.getElementById("show");
var newNode = document.createTextNode(data);
//clear nodes
if (el.childNodes) {
for (var i = 0; i < el.childNodes.length; i++) {
var childNode = el.childNodes[i];
el.removeChild(childNode);
}
}
el.appendChild(newNode);
}
}
</script>
<h1>Hello~ Ajax</h1>
<form method="GET">
<input type="text" id="data" />
<input value="Get Number" type="button" onClick="sendData();" />
</form>
<h2><div id="show"> </div></h2>
</body>
</html>
ajax.php
<?php
$num = 1000 + rand(0,1000);
echo $num;
?>