C#实现页面加载

最新推荐文章于 2023-06-12 16:55:02 发布

原创最新推荐文章于 2023-06-12 16:55:02 发布 · 826 阅读

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protected void Page_Load(object sender, EventArgs e)
    {
        Loading();
    }

public void Loading()
    {
        HttpContext hc = HttpContext.Current;
        //创建一个页面居中的div
        hc.Response.Write("<div id='loading'style='position: absolute; height: 100px; text-align: center;z-index: 9999; left: 50%; top: 50%; margin-top: -50px; margin-left: -175px;'> ");
        hc.Response.Write("<br />页面正在加载中，请稍候<br /><br /> ");
        hc.Response.Write("<table border='0' cellpadding='0' cellspacing='0' style='background-image: url(images/Progress/plan-bg.gif);text-align: center; width: 300px;'> ");
        hc.Response.Write("<tr><td style='height: 20px; text-align: center'><marquee direction='right' scrollamount='30' width='290px'> <img height='10' src='images/Progress/plan-wait.gif' width='270' />");
        hc.Response.Write("</marquee></td></tr></table></div>");
        //hc.Response.Write("<script>mydiv.innerText = '';</script>");
        hc.Response.Write("<script type=text/javascript>");
        //最重要是这句了,重写文档的onreadystatechange事件,判断文档是否加载完毕
        hc.Response.Write("function document.onreadystatechange()");
        hc.Response.Write(@"{ try
                                   {
                                    if (document.readyState == 'complete')
                                    {
                                         delNode('loading');

                                    }
                                   }
                                 catch(e)
                                    {
                                        alert('页面加载失败');
                                    }
                                                        }

                            function delNode(nodeId)
                            {
                                try
                                {
                                      var div =document.getElementById(nodeId);
                                      if(div !==null)
                                      {
                                          div.parentNode.removeChild(div);
                                          div=null;
                                          CollectGarbage();
                                      }
                                }
                                catch(e)
                                {
                                   alert('删除ID为'+nodeId+'的节点出现异常');
                                }
                            }

                            ");

        hc.Response.Write("</script>");
        hc.Response.Flush();
    }