AJAX 實例
AJAX 實例
一個簡單的AJAX實例
實例
<html><!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","/try/ajax/ajax_info.txt",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>使用 AJAX 修改该文本内容</h2></div>
<button type="button" onclick="loadXMLDoc()">修改内容</button>
</body>
</html>運行實例»
點擊"運行實例" 按鈕查看線上實例
#建立一個簡單的XMLHttpRequest，從一個TXT檔案傳回資料。
用AJAX載入XML 檔案
實例
<html><!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc(url)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById('A1').innerHTML=xmlhttp.status;
document.getElementById('A2').innerHTML=xmlhttp.statusText;
document.getElementById('A3').innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<h2>Retrieve data from XML file</h2>
<p><b>Status:</b><span id="A1"></span></p>
<p><b>Status text:</b><span id="A2"></span></p>
<p><b>Response:</b><span id="A3"></span></p>
<button onclick="loadXMLDoc('note.xml')">Get XML data</button>
</body>
</html>##執行實例»點擊"運行實例" 按鈕查看線上實例
用AJAX進行一次HEAD 請求
#實例
#執行實例» 點擊"執行實例" 按鈕查看線上實例
檢索資源（檔案）的頭資訊。 <html><!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc(url)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById('p1').innerHTML=xmlhttp.getAllResponseHeaders();
}
}
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<p id="p1">The getAllResponseHeaders() function returns the header information of a resource, like length, server-type, content-type, last-modified, etc.</p>
<button onclick="loadXMLDoc('/try/ajax/ajax_info.txt')">Get header information</button>
</body>
</html>#執行實例» 點擊"執行實例" 按鈕查看線上實例
用AJAX進行一次指定的HEAD 請求
#實例
運行實例»點擊"運行實例" 按鈕查看線上實例
檢索資源（檔案）的指定頭資訊。 <html><!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc(url)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById('p1').innerHTML="Last modified: " + xmlhttp.getResponseHeader('Last-Modified');
}
}
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<p id="p1">The getResponseHeader() function is used to return specific header information from a resource, like length, server-type, content-type, last-modified, etc.</p>
<button onclick="loadXMLDoc('/try/ajax/ajax_info.txt')">Get "Last-Modified" information</button>
</body>
</html>運行實例»點擊"運行實例" 按鈕查看線上實例
用AJAX從ASP 檔案回傳資料
實例
執行實例»點擊"運行實例" 按鈕查看線上實例
當使用者在文字方塊內鍵入字元時網頁如何與Web伺服器進行通訊<html><!DOCTYPE html>
<html>
<head>
<script>
function showHint(str)
{
var xmlhttp;
if (str.length==0)
{
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","/try/ajax/gethint.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<h3>Start typing a name in the input field below:</h3>
<form action="">
First name: <input type="text" id="txt1" onkeyup="showHint(this.value)" />
</form>
<p>Suggestions: <span id="txtHint"></span></p>
</body>
</html>執行實例»點擊"運行實例" 按鈕查看線上實例
用AJAX從資料庫返回資料
實例
#執行實例»點擊"運行實例"按鈕查看線上實例
用AJAX網頁如何取得資料庫中的資訊<html><!DOCTYPE html>
<html>
<head>
<script>
function showCustomer(str)
{
var xmlhttp;
if (str=="")
{
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","/try/ajax/getcustomer.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form action="">
<select name="customers" onchange="showCustomer(this.value)" style="font-family:Verdana, Arial, Helvetica, sans-serif;">
<option value="APPLE">Apple Computer, Inc.</option>
<option value="BAIDU ">BAIDU, Inc</option>
<option value="Canon">Canon USA, Inc.</option>
<option value="Google">Google, Inc.</option>
<option value="Nokia">Nokia Corporation</option>
<option value="SONY">Sony Corporation of America</option>
</select>
</form>
<br>
<div id="txtHint">Customer info will be listed here...</div>
</body>
</html>#執行實例»點擊"運行實例"按鈕查看線上實例
用AJAX從XML 檔案傳回資料
實例
執行實例»#點擊"運行實例" 按鈕查看線上實例
建立一個XMLHttpRequest從XML檔案中檢索資料並顯示在一個HTML表格中。 <html><!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc(url)
{
var xmlhttp;
var txt,x,xx,i;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
txt="<table border='1'><tr><th>Title</th><th>Artist</th></tr>";
x=xmlhttp.responseXML.documentElement.getElementsByTagName("CD");
for (i=0;i<x.length;i++)
{
txt=txt + "<tr>";
xx=x[i].getElementsByTagName("TITLE");
{
try
{
txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
}
catch (er)
{
txt=txt + "<td> </td>";
}
}
xx=x[i].getElementsByTagName("ARTIST");
{
try
{
txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
}
catch (er)
{
txt=txt + "<td> </td>";
}
}
txt=txt + "</tr>";
}
txt=txt + "</table>";
document.getElementById('txtCDInfo').innerHTML=txt;
}
}
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="txtCDInfo">
<button onclick="loadXMLDoc('cd_catalog.xml')">Get CD info</button>
</div>
</body>
</html>執行實例»#點擊"運行實例" 按鈕查看線上實例
用callback函數的AJAX實例
#實例
<!DOCTYPE html>
<html>
<head>
<script>
var xmlhttp;
function loadXMLDoc(url,cfunc)
{
if (window.XMLHttpRequest)
{// IE7+, Firefox, Chrome, Opera, Safari 代码
xmlhttp=new XMLHttpRequest();
}
else
{// IE6, IE5 代码
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=cfunc;
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
function myFunction()
{
loadXMLDoc("/try/ajax/ajax_info.txt",function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
});
}
</script>
</head>
<body>
<div id="myDiv"><h2>使用 AJAX 修改文本内容</h2></div>
<button type="button" onclick="myFunction()">修改内容</button>
</body>
</html>#用一個callback函數建立一個XMLHttpRequest，並從一個TXT檔案中檢索資料。
