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Ajax简单示例之改变下拉框动态生成表格

Posted on 2007-02-08 13:23  余墨  阅读(352)  评论(0)    收藏  举报

1.建立一个aspx页面，html代码
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</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() 
        {
            //debugger;
            var ProvinceID=document.getElementById("DropDownList1");           
            createXMLHttpRequest();
            xmlHttp.onreadystatechange = handleStateChange;
            xmlHttp.open("GET", "?ProvinceID="+ProvinceID.value, true);
            xmlHttp.send(null);
        }
            
        function handleStateChange() 
        {
            if(xmlHttp.readyState == 4) //0(未初始化);1(正在装载);2 (装载完毕);3 (交互中);4 (完成) 
            {
                if(xmlHttp.status == 200) //200(OK);404(not found)
                {
                    document.getElementById("gridiv").innerHTML=xmlHttp.responseText;
                }
            }
        }
        </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server">
        </asp:DropDownList>   
    </div>
    <div id ="gridiv"></div>
    </form>
</body>
</html>
2.cs代码
using System.Data.SqlClient;

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            this.DropDownList1.Attributes.Add("onchange", "return startRequest();");
            ListProvince();
            if (ProvinceID != "")
            {
                GetCityByProvinceID(ProvinceID);
            }
        }
    }

    property

    GetDataSet

    GetCityByProvinceID

    ListProvince
3.示例数据库下载area1.rar
转自：http://www.cnblogs.com/singlepine/archive/2006/05/03/391292.html