AJAX - ?? ??
????? ??? ???? XMLHttpRequest ??? responseText ?? responseXML ??? ?????.
ResponseText ? ResponseXML
?? ???? ??? XML, ?? ???, (X)HTML ?? JSON(JavaScript Object Notation)? ?? ??? ???? ??? ? ????. ??? ???? ??? ?? responseText ?? responseXML? ???? ? ?? ???? ??? ? ????.
responseText ???? XML ??? ?? ??? ?????. ?? ??? ???? ??? ??? ??? ?????. ?? ???, (X)HTML ? JSON? ?? responseText? ?????. responseText? ???? ???? ??? ? ?? ?? ??? AJAX ??? ???? ?? ?????. ?? ?? XML ???? JSON ????? ???? ?? ??? ??? ?? ?? ??? ??? ???? ??? ??? ?? ??? ? ????. ?? ???? ?? ?? ???? ???? ??? ?????. ?? ?? ??? ?? ?? ??? ????? ?? ???.
responseXML? ??? ?? ?????. ??? JSON ??? ????? XML?? ??? ??? ?????. ?? ?? ?? ? ?? XML ???? ?? ??? ???? ????.
var response = ajax.request.responseXML.documentElement;
???? ?? ??? ?????? ???? ?? ?? ?????.
var header = response.getElementsByTagName('header')[0] .firstChild .data;
var ?? = response.getElementsByTagName('description')[0].firstChild.data;
var sourceUrl = response.getElementsByTagName('sourceUrl')[0]. data;
????? ?? div ??? ?? ??? ?????.
$("body").html("<b>" + header + "</b>< br/> ;"
??????????????????????????????????????????????????????????;
responseText ??? ??? ???? ?????.
<!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","ajax_info.txt",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>使用 AJAX 修改該文本內(nèi)容</h2></div>
<button type="button" onclick="loadXMLDoc()">修改內(nèi)容</button>
</body>
</html> ??? ??? XML?? XML ??? ?? ???? ?? ?? responseXML ?? ? ???? cd_catalog.xml ??? ?? ??? ?? ?????. <!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc()
{
var xmlhttp;
var txt,x,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)
{
xmlDoc=xmlhttp.responseXML;
txt="";
x=xmlDoc.getElementsByTagName("ARTIST");
for (i=0;i<x.length;i++)
{
txt=txt + x[i].childNodes[0].nodeValue + "<br>";
}
document.getElementById("myDiv").innerHTML=txt;
}
}
xmlhttp.open("GET","cd_catalog.xml",true);
xmlhttp.send();
}
</script>
</head>
<body>
<h2>My CD Collection:</h2>
<div id="myDiv"></div>
<button type="button" onclick="loadXMLDoc()">Get my CD collection</button>
</body>
</html>?:
<!DOCTYPE HTML>
<html>
<head>
<meta charset=utf-8" />
<title>Using responseText with innerHTML</title>
<script type="text/javascript">
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
}
function startRequest(){
createXMLHttpRequest();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET","innerHTML.xml",true);
xmlHttp.send(null);
}
function handleStateChange(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
document.getElementById("results").innerHTML=xmlHttp.responseText;
}
}
}
</script>
</head>
<body>
<form>
<input type="button" value="Search for Today's Activities" onclick="startRequest();"/>
</form>
<div id="results"></div>
</body>
</html>innerHTML.xml ??
<?xml version="1.0" encoding="utf-8"?> <table border="1"> <tbody> <tr><th>Activity Name</th><th>Location</th><th>Time</th></tr> <tr><td>Waterskiing</td><td>Dock #1</td><td>9:00 AM</td></tr> <tr><td>Volleyball</td><td>East Court</td><td>2:00 PM</td></tr> <tr><td>Hiking</td><td>Trail 3</td><td>3:30 PM</td></tr> </tbody> </table>
