在BS系统中，有时候一个业务操作需要花很多的时间处理，如果没有任何提示的话，用户还以为是没有点到会继续点击，造成二次点击，或者产生不耐烦的心里。所有最好加个滚动的提示，罩在页面上，一来控制用户再次点击，而来让用户感觉到计算机正在运行操作：如下图

其实这个东东只要写很少的代码就能实现，JS代码如下：

function $()
{
var elements = new Array();
for (var i = 0; i < arguments.length; i++)
{
var element = arguments[i];
if (typeof element == 'string')
element = document.getElementById(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}


function Show(message) {
HideElement();
var eSrc=(document.all)?window.event.srcElement:arguments[1];
var shield = document.createElement("DIV");//产生一个背景遮罩层
shield.id = "shield";
shield.style.position = "absolute";
shield.style.left = "0px";
shield.style.top = "0px";
shield.style.width = "100%";
shield.style.height = ((document.documentElement.clientHeight>document.documentElement.scrollHeight)?document.documentElement.clientHeight:document.documentElement.scrollHeight)+"px";
//shield.style.height =document.body.scrollHeight;
shield.style.background = "#333";
shield.style.textAlign = "center";
shield.style.zIndex = "10000";
shield.style.filter = "alpha(opacity=0)";
shield.style.opacity = 0;

var alertFram = document.createElement("DIV");//产生一个提示框
var height="50px";
alertFram.id="alertFram";
alertFram.style.position = "absolute";
alertFram.style.width = "200px";
alertFram.style.height = height;
alertFram.style.left = "35%";
alertFram.style.top = "30%";
// alertFram.style.marginLeft = "-225px" ;
// alertFram.style.marginTop = -75+document.documentElement.scrollTop+"px";
alertFram.style.background = "#fff";
alertFram.style.textAlign = "center";
alertFram.style.lineHeight = height;
alertFram.style.zIndex = "10001";

strHtml =" <div style=\"width:100%; border:#58a3cb solid 1px; text-align:center;padding-top:10px \">";
strHtml+=" <img src=\"load1.gif\"><br>";
if (typeof(message)=="undefined"){
strHtml+=" 正在服务器上执行, 请稍候";
}
else{
strHtml+=message;
}
strHtml+=" </div>";

strHtml+="<iframe src=\"\" style=\"position:absolute; visibility:inherit;top:0px; left:0px; width:300px; height:100px; z-index:-1; filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)';\"></iframe>";//加个iframe防止被drowdownlist等控件挡住

alertFram.innerHTML=strHtml;
document.body.appendChild(alertFram);
document.body.appendChild(shield);

this.setOpacity = function(obj,opacity){
if(opacity>=1)opacity=opacity/100;
try{ obj.style.opacity=opacity; }catch(e){}
try{
if(obj.filters.length>0&&obj.filters("alpha")){
obj.filters("alpha").opacity=opacity*100;
}else{
obj.style.filter="alpha(opacity=\""+(opacity*100)+"\")";
}
}
catch(e){}
}

var c = 0;
this.doAlpha = function(){
if (++c > 20){clearInterval(ad);return 0;}
setOpacity(shield,c);
}
var ad = setInterval("doAlpha()",1);//渐变效果

eSrc.blur();
document.body.onselectstart = function(){return false;}
document.body.oncontextmenu = function(){return false;}
}

//隐藏页面上一些特殊的控件
function HideElement() {
var HideElementTemp = new Array('IMG','SELECT','OBJECT','IFRAME');
for(var j=0;j<HideElementTemp.length;j++){
try{
var strElementTagName=HideElementTemp[j];
for(i=0;i<document.all.tags(strElementTagName).length; i++){
var objTemp = document.all.tags(strElementTagName)[i];
if(!objTemp||!objTemp.offsetParent)
continue;
//objTemp.style.visibility="hidden";
objTemp.disabled="disabled"
}
}
catch(e){}
}
}


function Close() {
var shield= $("shield");
var alertFram= $("alertFram");
if(shield!=null) {
document.body.removeChild(shield);
}
if(alertFram!=null) {
document.body.removeChild(alertFram);
}
document.body.onselectstart = function(){return true};
document.body.oncontextmenu = function(){return true};
}

在asp.net页面上直接把此JS文件包括进来，调用Show方法就行，如 this.Button1.Attributes.Add("onClick","Show();");

本文转自94cool博客园博客，原文链接：http://www.cnblogs.com/94cool/archive/2009/09/07/1561850.html，如需转载请自行联系原作者