实现 网页的 数据加载中.... 效果,很简单哦

数据量比较大的时候,页面加载往往加载需要一些时间,而这个时候用户如果只看到白屏的网页会以后IE死了,为了使自己的网站更加人性化。用javascript来实现页面正在加载中的提示,先网页面里面写入一个层,显示加载框,然后等页面结束后在body的onload中写入事件,隐藏该对话框
         #region "页面加载中效果"
         
/// <summary>
         /// 页面加载中效果
         /// </summary>
         public static void initJavascript(System.Web.UI.Page page)
         {
             StringBuilder Builder 
= new StringBuilder();
             Builder.Append(
"<style>");
             Builder.Append(
"#loader_container {text-align:center; position:absolute; top:40%; 100%; left: 0;}");
             Builder.Append(
"#progress {height:5px; font-size:1px; 1px; position:relative; top:1px; left:0px; background-color:#8894a8;}");
             Builder.Append(
"#loader_bg {background-color:#e4e7eb; position:relative; top:8px; left:8px; height:7px; 260px; font-size:1px;}");
             Builder.Append(
"</style>");
             Builder.Append(
"<div id=loader_container>");
             Builder.Append(
"<div id=loader style='left: 300px; top: 150px;border- 3px; border-color: #B3D9D9; border-style:solid; position: absolute;z-index: 20000; background-color: #D1E9E9; cursor: wait;  300px; height: 75px;vertical-align: middle; padding: 10px 10px 10px 10px;'>");
             Builder.Append(
"<div id=loader_bg><div id=progress> </div></div>");
             Builder.Append(
"<div align='center' style='text-align:center;100%'> <br/>页面加载中,请稍等...</div>");
             Builder.Append(
"</div></div>");
             Builder.Append(
" <script language=JavaScript type=text/javascript>");
             Builder.Append(
"var t_id = setInterval(animate,10);");
             Builder.Append(
"var pos=0;var dir=2;var len=0;");
             Builder.Append(
"function animate(){");
             Builder.Append(
"var elem = document.getElementById('progress');");
             Builder.Append(
"if(elem != null) {");
             Builder.Append(
"if (pos==0) len += dir;");
             Builder.Append(
"if (len>32 || pos>79) pos += dir;");
             Builder.Append(
"if (pos>79) len -= dir;");
             Builder.Append(
" if (pos>79 && len==0) pos=0;");
             Builder.Append(
"elem.style.left = pos;");
             Builder.Append(
"elem.style.width = len;");
             Builder.Append(
"}}");
             Builder.Append(
"function remove_loading() {");
             Builder.Append(
" this.clearInterval(t_id);");
             Builder.Append(
"var targelem = document.getElementById('loader_container');");
             Builder.Append(
"targelem.style.display='none';");
             Builder.Append(
"targelem.style.display='none';");
             Builder.Append(
"}");
             Builder.Append(
"</script>");
             HttpContext.Current.Response.Flush();
//这里在内容页前加入事件,防止页面原本的布局乱了,用HttpContext.Current.Response.Write的方法会使页面布局乱了
             page.ClientScript.RegisterClientScriptBlock(page.GetType(), "messagesss", Builder.ToString());
         }
         #endregion


调用方法很简单,只需要在Page_Load()时间调用该方法:注意要写在 if (!IsPostBack) 里面
然后在<body onload="remove_loading();">,这里是用来隐藏DIV的;
是不是感觉很简单呢?
原文地址:https://www.cnblogs.com/lujin49/p/2132148.html