登陆状态显示

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default1.aspx.cs" Inherits="Default1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <style type="text/css">
        .aaa {
            position:relative;
            background-color:red;
            width:200px;
            height:50px;
            margin-left:5px;
            float:left;
        }
    </style>

</head>
<body>
    <form id="form1" runat="server">
        <div id="Login" class="aaa">
            <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>，欢迎你！&nbsp;
            <asp:Button ID="Button1" runat="server" Text="退出登陆" />
        </div>
        <div id="noLogin" class="aaa">
            <asp:HyperLink ID="HyperLink1" runat="server">登陆</asp:HyperLink>&nbsp;
            <asp:HyperLink ID="HyperLink2" runat="server">注册</asp:HyperLink>
        </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Button1.Click += Button1_Click;//按钮事件

        if (!IsPostBack) {
            Session["user"] = "张三";//判断用户是否登陆。若登陆  则显示张三
        }
        //window.onload = function () 往外输出。。。          //都全部取出来 取两个 1：Login  2：noLogin
        Response.Write("<script>window.onload = function () {var oLog = document.getElementById('Login');var noLog = document.getElementById('noLogin');");
        if (Session["user"] != null)//判断user是否为空，若不为空咋显示oLog，隐藏noLog。
        {
            Response.Write("oLog.style.display = 'block';noLog.style.display = 'none';");//none隐藏block显示
            Label1.Text = Session["user"].ToString();
        }
        else//若不是  则相反
        {
            Response.Write("oLog.style.display = 'none';noLog.style.display = 'block';");
        }
        Response.Write("};</script>");
    }

    void Button1_Click(object sender, EventArgs e)
    {
        Session["user"] = null;
    }
}

posted on 2016-07-28 12:57 爱意红沉阅读(214) 评论(0) 收藏举报