📄 webcontrol.aspx
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<%@ Import namespace="System.Collections" %>
<html>
<head>
<title>控件事件</title>
<script Language="C#" runat="server" >
public ArrayList DongBei;
public ArrayList XiBei;
public ArrayList HuaBei;
public Hashtable Areas;
void Page_Load()
{
DongBei = new ArrayList();
DongBei.Add("黑龙江");
DongBei.Add("吉林");
DongBei.Add("辽宁");
XiBei = new ArrayList();
XiBei.Add("新疆");
XiBei.Add("青海");
XiBei.Add("宁夏");
XiBei.Add("甘肃");
XiBei.Add("陕西");
HuaBei = new ArrayList();
HuaBei.Add("内蒙");
HuaBei.Add("河北");
HuaBei.Add("山东");
HuaBei.Add("山西");
HuaBei.Add("河南");
Areas = new Hashtable();
Areas.Add("东北", DongBei);
Areas.Add("西北", XiBei);
Areas.Add("华北", HuaBei);
lstArea.AutoPostBack = true;
lstArea.SelectedIndexChanged += new EventHandler(AreaChanged);
Button1.Click += new EventHandler(OnOK);
if(IsPostBack == false)
{
lstArea.DataSource = Areas.Keys;
lstArea.DataBind();
lstProvince.DataSource = Areas["东北"];
lstProvince.DataBind();
}
}
void AreaChanged(object sender, EventArgs e)
{
lstProvince.DataSource = Areas[lstArea.SelectedItem.Text];
lstProvince.DataBind();
}
void OnOK(object sender, EventArgs e)
{
Result.Text = "你选择的是" + lstArea.SelectedItem.Text + "地区" + lstProvince.SelectedItem.Text + "省";
}
</script>
</head>
<body>
<h3>选择省份</h3>
<form id="form1" runat="server">
地区：<asp:DropDownList id="lstArea" width="100" runat="server" /> <br/>
省份：<asp:DropDownList id="lstProvince" width="100" runat="server" /> <br/>
<asp:Label id="Result" runat="server" /> <hr/>
<asp:Button id="Button1" text="确定" runat="server"/>
</form>
</body>
</html>
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