javascript方法获取后台控件调用、传参

1) 后台代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace JSDEmo
{
    public partial class _Default : System.Web.UI.Page
    {
        private TextBox txtDemo;
        private Button btnDemo;
        protected void Page_Load(object sender, EventArgs e)
        {
            txtDemo = new TextBox();
            txtDemo.ID = "txtDemo";
            btnDemo = new Button();
            btnDemo.ID = "btnDemo";
            btnDemo.Text = "Demo";
            this.FindControl("ContentPanel").Controls.Add(txtDemo);
            btnDemo.OnClientClick = string.Format("return demo('{0}');",txtDemo.ClientID);
            this.FindControl("contentPanel").Controls.Add(btnDemo);
        }
    }
}

2) 前代代码:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="JSDEmo._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></title>
    <script language="javascript" type="text/javascript">
        function demo(clientId) {
            var txt = document.getElementById(clientId);
            if (txt.value == "") {
                alert("请输入数据!");
            }
            return false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Panel ID="contentPanel" runat="server"></asp:Panel>
    </div>
    </form>
</body>
</html>


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