Ajax级联菜单实例代码

2024-09-01 08:28:50

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1.Ajax.html
代码如下:
<!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>

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