Ajax级联菜单实例代码

1.Ajax.html


<!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>
<title>Ajax</title>
<script type=”text/javascript”>
function loadXMLDoc(txt) {
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) {
var citys = xmlhttp.responseText.split(‘,’);
document.getElementById(“citys”).length = 1;
for (i = 0; i < citys.length – 1; i++) {

document.getElementById(“citys”).add(new Option(citys[i], citys[i]));
}
// document.getElementById(“myDiv”).innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open(“GET”,”ajax/getdata.aspx?pro=”+txt, true);
xmlhttp.send();
}
</script>
</head>
<body>

<h2>AJAX</h2>
<select id=”Select1″ onchange=”loadXMLDoc(this.value)”>
<option>请选择省份</option>
<option value=”1″>江苏</option>
<option value=”2″>上海</option>
</select>
<select id=”citys”>
<option>请选择城市</option>
</select>
<div id=”myDiv”></div>

</body>
</html>

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