Asp.net"页面加载中"效果实现(转)

在网上找了好多，实现方式大多是使用定时器

个人觉得定时器会造成一定程度上的假象

（如：定时器还没结束页面已经加载完毕，或定时器结束后页面还没加载完成）

本方法利用的是javascript，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

方法（我的系统是多个页面，所以写了一个公用的类common.cs）：

在类里面加入如下函数（也可在每个代码后文件中写入）：

"页面加载中效果"#region "页面加载中效果"

/// <summary>

/// 页面加载中效果

/// </summary>

public static void initJavascript()

{

HttpContext.Current.Response.Write(" <script language=JavaScript type=text/javascript>");

HttpContext.Current.Response.Write("var t_id = setInterval(animate,20);");

HttpContext.Current.Response.Write("var pos=0;var dir=2;var len=0;");

HttpContext.Current.Response.Write("function animate(){");

HttpContext.Current.Response.Write("var elem = document.getElementById('progress');");

HttpContext.Current.Response.Write("if(elem != null) {");

HttpContext.Current.Response.Write("if (pos==0) len += dir;");

HttpContext.Current.Response.Write("if (len>32 || pos>79) pos += dir;");

HttpContext.Current.Response.Write("if (pos>79) len -= dir;");

HttpContext.Current.Response.Write(" if (pos>79 && len==0) pos=0;");

HttpContext.Current.Response.Write("elem.style.left = pos;");

HttpContext.Current.Response.Write("elem.style.width = len;");

HttpContext.Current.Response.Write("}}");

HttpContext.Current.Response.Write("function remove_loading() {");

HttpContext.Current.Response.Write(" this.clearInterval(t_id);");

HttpContext.Current.Response.Write("var targelem = document.getElementById('loader_container');");

HttpContext.Current.Response.Write("targelem.style.display='none';");

HttpContext.Current.Response.Write("targelem.style.visibility='hidden';");

HttpContext.Current.Response.Write("}");

HttpContext.Current.Response.Write("</script>");

HttpContext.Current.Response.Write("<style>");

HttpContext.Current.Response.Write("#loader_container {text-align:center; position:absolute; top:40%; width:100%; left: 0;}");

HttpContext.Current.Response.Write("#loader {font-family:Tahoma, Helvetica, sans; font-size:11.5px; color:#000000; background-color:#FFFFFF; padding:10px 0 16px 0; margin:0 auto; display:block; width:130px; border:1px solid #5a667b; text-align:left; z-index:2;}");

HttpContext.Current.Response.Write("#progress {height:5px; font-size:1px; width:1px; position:relative; top:1px; left:0px; background-color:#8894a8;}");

HttpContext.Current.Response.Write("#loader_bg {background-color:#e4e7eb; position:relative; top:8px; left:8px; height:7px; width:113px; font-size:1px;}");

HttpContext.Current.Response.Write("</style>");

HttpContext.Current.Response.Write("<div id=loader_container>");

HttpContext.Current.Response.Write("<div id=loader>");

HttpContext.Current.Response.Write("<div align=center>页面正在加载中

</div>");

HttpContext.Current.Response.Write("<div id=loader_bg><div id=progress> </div></div>");

HttpContext.Current.Response.Write("</div></div>");

HttpContext.Current.Response.Flush();

}

#endregion

}

之后在需要调用的页面中在Page_Load()时间调用该方法：

Common.initJavascript();

并在每个页面body加载完毕后调用隐藏该div的事件

完毕！

posted @ 2009-08-21 10:25 瞭望者阅读(1161) 评论(1) 收藏举报

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