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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="Test.WebForm4" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="Name" runat="server" onchange="Test(this, 'Age')">
<asp:ListItem Value="1">1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
</asp:DropDownList>
另外一个控件:
<asp:TextBox ID="Age" runat="server" MaxLength="100"> </asp:TextBox>
</div>
</form>
</body>
<script type="text/javascript">
function Test(thisControl, otherControl) {
var a = document.getElementById("otherControl");
alert(a);
//返回为 null
var b = document.getElementById(otherControl);
alert(b.id);
//返回为正常 "Age"
}
</script>
</html>
<script type="text/javascript">
function test(controlId, minGradeId) {
var a = document.getElementById("minGradeId");
alert(a); //返回为 null
var b = document.getElementById(minGradeId);
alert(b.id); //什么都没弹出来
</script>
<asp:DropDownList ID="Name" runat="server" onchange="Test(this, 'Age', 'Age2')"> </asp:DropDownList>
function Test(thisControl, otherControl, otherControl2)
{
var age=document.getElementById(otherControl);
var age2=document.getElementById(otherControl2);
}