lz您好，还以为您已经搞定了，下面是按上次给的思路写的代码，加粗部分是新添加的，请参考(在vs2008上测试通过)：
1、aspx页面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebFormCallClientJS.aspx.cs" Inherits="WebApplication1.WebFormCallClientJS" %>
<!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 id="Head1" runat="server">
<title>服务器控件调用客户端方法</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
<Scripts>
<asp:ScriptReference Path="ClientEventTest.js" />
</Scripts>
</asp:ScriptManager>
<script type="text/javascript">
function Button1_Click()
{
$get("<%= Label1.ClientID %>").innerHTML = "aaaa";
return false;
}
</script>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem>选项一</asp:ListItem>
<asp:ListItem>选项二</asp:ListItem>
</asp:DropDownList>
<br />
<asp:Button ID="Button1" runat="server" Text="设置标签文本为aaaa" OnClick="Button1_Click" OnClientClick="javascript:return Button1_Click();" />
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div id="layout">
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
</form>
</body>
</html>
2、codebehind代码基本没动
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class WebFormCallClientJS : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = "希望通过下单菜单SelectedIndexChanged事件调用按钮的OnClientClick='javascript:return Button1_Click()'";
}
protected void Button1_Click(object sender, EventArgs e)
{
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}
3、新增js
var app = Sys.Application;
var postBackElement;
app.add_init(ApplicationInit);
// Application event handlers for component developers.
function ApplicationInit(sender) {
var prm = Sys.WebForms.PageRequestManager.getInstance();
if (!prm.get_isInAsyncPostBack()) {
prm.add_beginRequest(BeginRequestHandler);
prm.add_endRequest(EndRequest);
}
}
function BeginRequestHandler(sender, args) {
postBackElement = args.get_postBackElement();
}
function EndRequest(sender, args) {
if (postBackElement.id == "DropDownList1") {
//可以在这里判断是否是下拉框触发的动作
alert(postBackElement.id);
}
Button1_Click();
}
