WebForm开发形式操作时使用层达到遮罩效果_c# webform button弹遮罩层功能

<div id="doing" runat="server" style="Z-INDEX: 12000; LEFT: 0px; WIDTH: 100%; CURSOR: wait; POSITION: absolute; TOP: 0px; HEIGHT: 100%"> <table width="100%" height="100%"> <tr align="center" valign="middle"> <td> <table width="169" height="62" bgcolor="#99cccc" style="FILTER: Alpha(Opacity=75); WIDTH: 169px; HEIGHT: 62px"> <tr align="center" valign="middle"> <td>页面提交中 .<br/> Loading .</td> </tr> </table> </td> </tr> </table> </div> protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { this.Button1.Attributes.Add("onclick", "javascript:document.getElementById('doing').style.visibility='visible';"); LoadData(); } } override protected void OnPreRender(EventArgs e) { this.RegisterStartupScript("clientScript", "<mce:script language='javascript'><!-- javascript:document.getElementById('doing').style.display='none' // --></mce:script>"); //doing.Style.Add("visibility", "hidden"); }