js调用DropDownList里的值和在DropDownList服务器端事件里调用js
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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 runat="server">
<title>DropdownList</title>
<script language="javascript" type="text/javascript">
<!--
function getDDLTextandValue()
{
var DDL=document.getElementById("DropDownList1");
var index=DDL.selectedIndex;//这里selectedIndex中Index的I一定为大写
var Text=DDL.options[index].text;
var Value=DDL.options[index].value;
// alert(Value);
var txt=document.getElementById("TextBox1");
//这里必须为txt.value,而不是txt.text，对用惯了服务器端的TextBox.Text的我来说，这点容易忽略
txt.value=Value;
}
//-->
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
value：<asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
<br />
<br />
选取值：<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="a">值一</asp:ListItem>
<asp:ListItem Value="b">值二</asp:ListItem>
<asp:ListItem Value="c">值三</asp:ListItem>
<asp:ListItem Value="d">值四</asp:ListItem>
<asp:ListItem Value="e">值五</asp:ListItem>
</asp:DropDownList>
</div>
</form>
</body>
</html>
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
ClientScript.RegisterStartupScript(this.GetType(), "", "<script>getDDLTextandValue()</script>");
}
}
