对于长时间装载的ASP.NET页面如何在客户端浏览器中显示进度？

对于加载时间比较长的ASP.NET页面，我们可以在客户端浏览器中显示进度条来显示页面正在装载。下面就是具体的实现过程：

1. 新建项目，名字为WebPortal，在项目类型中选择Visual C#项目或者Visual Basic项目都可；
2. 在模板类型中选择ASP.NET Web应用程序；
3. 位置里输入：http://localhost/WebPortal；
4. 添加新项：名字为ShowProgress的Web窗体。
5. 在您的Web窗体ShowProgress.aspx上添加任何其他的Web服务器控件。
6. 在ShowProgress.aspx上单击右键，点“查看代码”，在最上面输入：
   Visual C# .NET代码

   using System.Threading;
       

   Visual Basic .NET代码

   Imports System.Threading
       

7. 在Page_Load事件里输入： Visual C# .NET代码

   Response.Write("<div id='mydiv' >");
       Response.Write("_");
       Response.Write("</div>");
       Response.Write("<script>mydiv.innerText = '';</script>");
       Response.Write("<script language=javascript>;");
       Response.Write("var dots = 0;var dotmax = 10;function ShowWait()");
       Response.Write("{var output; output = '正在装载页面';dots++;if(dots>=dotmax)dots=1;");
       Response.Write("for(var x = 0;x < dots;x++){output += '·';}mydiv.innerText =  output;}");
       Response.Write("function StartShowWait(){mydiv.style.visibility = 'visible'; ");
       Response.Write("window.setInterval('ShowWait()',1000);}");
       Response.Write("function HideWait(){mydiv.style.visibility = 'hidden';");
       Response.Write("window.clearInterval();}");
       Response.Write("StartShowWait();</script>");
       Response.Flush();
       Thread.Sleep(10000);
       

   Visual Basic .NET代码

   Response.Write("<div id='mydiv' >")
       Response.Write("_")
       Response.Write("</div>")
       Response.Write("<script>mydiv.innerText = '';</script>")
       Response.Write("<script language=javascript>;")
       Response.Write("var dots = 0;var dotmax = 10;function ShowWait()")
       Response.Write("{var output; output = '正在装载页面';dots++;if(dots>=dotmax)dots=1;")
       Response.Write("for(var x = 0;x < dots;x++){output += '·';}mydiv.innerText =  output;}")
       Response.Write("function StartShowWait(){mydiv.style.visibility = 'visible'; ")
       Response.Write("window.setInterval('ShowWait()',1000);}")
       Response.Write("function HideWait(){mydiv.style.visibility='hidden';")
       Response.Write("window.clearInterval();}")
       Response.Write("StartShowWait();</script>")
       Response.Flush()
       Thread.Sleep(10000)
       

8. 在ShowProgress.aspx窗体的html的中输入：

   <script>
       HideWait();
       </script>
       

9. 点在浏览器中查看即可。

public class ManagerPageTemplate : System.Web.UI.Page
    {
        protected override void OnLoad(EventArgs e)
        {
            // if(Session["UserLevel"] == null)
            // Response.Write("<script lanuage=''javascript''>window.top.location.href=''../index.aspx'';</script>");
            // else
            // {
            // switch(Session["UserLevel"].ToString())
            // {
            // case "操作员":
            // Response.Write("<script lanuage=''javascript''>window.top.location.href=''../index.aspx'';</script>");
            // break;
            // case "管理员":
            // break;
            // }
            // }
            if (!Page.IsPostBack)
            {
                Response.Write("<div id=''mydiv'' >");
                Response.Write("_");
                Response.Write("</div>");
                Response.Write("<script>mydiv.innerText = '''';</script>");
                Response.Write("<script language=javascript>;");
                Response.Write("var dots = 0;var dotmax = 5;function ShowWait()");
                Response.Write("{var output; output = ''正在装载页面'';dots++;if(dots>=dotmax)dots=1;");
                Response.Write("for(var x = 0;x < dots;x++){output += ''·'';}mydiv.innerText = output;}");
                Response.Write("function StartShowWait(){mydiv.style.visibility = ''visible''; ");
                Response.Write("window.setInterval(''ShowWait()'',1000);}");
                Response.Write("function HideWait(){mydiv.style.visibility = ''hidden'';");
                Response.Write("window.clearInterval();}");
                Response.Write("StartShowWait();</script>");
                Response.Flush(); Thread.Sleep(10000);
                base.OnLoad(e);
            }
        }
    }

上边的代码最好放在这里边……否则每次加载时都会出来 比较讨厌