如何动态创建一个div对象(背景层)示例
<html xmlns=”http://www.w3.org/1999/xhtml“>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />
<title>创建浮动层</title>
<style type=”text/css”>
*{margin:0;padding:0;}
body{font-size:12px;}
</style>
</head>
<body>
<p>
动态创建一个div对象(背景层)示例
</p>
<p>
</p>
<p>
<input type=”button” value=”点击弹出” onClick=”createLayer(’动态创建一个div对象(背景层)示例’);” />
</p>
</body>
</html>
<script type=”text/javascript”>
window.onresize=function(){createLayer(”IT起步网…去看看吧”,true)}
function createLayer(str,bResize)
{
if(bResize)
{
document.body.removeChild(document.getElementById(”bgDiv”));//删除背景层Div
document.body.removeChild(document.getElementById(”msgDiv”));//删除提示框层
}
var bgColor, msgw,msgh,titleheight,titlecolor,bordercolor,sWidth,sHeight,mLeft,mRight;
bgColor=”#000″;//背景层的背景色
msgw=500;//提示窗口的宽度
msgh=200;//提示窗口的高度
bordercolor=”#336699″;//提示窗口的边框颜色
titleheight=30 //提示窗口标题高度
titlecolor=”#ccc”;//提示窗口的标题颜色
sWidth=document.body.clientWidth;
sHeight=document.body.clientHeight;
mLeft=(sWidth-msgw)/2;
mRight=(sHeight-msgh)/2;
var bgObj=document.createElement(”div”);//创建一个div对象(背景层)
//定义div属性,即相当于
//<div id=”bgDiv” style=”position:absolute; top:0;left:0; background-color:#666; filter:progid:DXImagesTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75); z-index:999;”></div>
bgObj.setAttribute(’id’,'bgDiv’);
bgObj.style.position=”absolute”;
bgObj.style.top=”0″;
bgObj.style.left=”0″;
bgObj.style.background=bgColor;
bgObj.style.filter=”progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=50)”;
bgObj.style.width=sWidth + “px”;
bgObj.style.height=sHeight + “px”;
bgObj.style.zIndex = “999″;
document.body.appendChild(bgObj);//在body内添加该div对象
var msgObj=document.createElement(”div”)//创建一个div对象(提示框层)
//定义div属性,即相当于
//<div id=”msgDiv” align=”center” style=”background-color:white; border:1px solid #336699; position:absolute; left:50%; top:50%; font:12px/1.6em Verdana,Geneva,Arial,Helvetica,sans-serif; margin-left:-225px; margin-top:npx; width:400px; height:100px; text-align:center; line-height:25px; z-index:100001;”></div>
msgObj.setAttribute(”id”,”msgDiv”);
msgObj.style.background=”white”;
msgObj.style.border=”1px solid ” + bordercolor;
msgObj.style.position = “absolute”;
msgObj.style.font=”12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif”;
msgObj.style.left = mLeft;
msgObj.style.top =mRight;
msgObj.style.width = msgw + “px”;
msgObj.style.height =msgh + “px”;
msgObj.style.textAlign = “center”;
msgObj.style.lineHeight =”25px”;
msgObj.style.zIndex = “1000″;
var title=document.createElement(”h4″);//创建一个h4对象(提示框标题栏)
//定义h4的属性,即相当于
//<h4 id=”msgTitle” align=”right” style=”margin:0; padding:3px; background-color:#336699; filter:progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100); opacity:0.75; border:1px solid #336699; height:18px; font:12px Verdana,Geneva,Arial,Helvetica,sans-serif; color:white; cursor:pointer;” onclick=”">关闭</h4>
title.setAttribute(”id”,”msgTitle”);
title.setAttribute(”align”,”right”);
title.style.margin=”0″;
title.style.padding=”3px”;
title.style.background=bordercolor;
title.style.filter=”progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);”;
title.style.opacity=”0.75″;
title.style.border=”1px solid ” + bordercolor;
title.style.font=”12px bold Verdana, Geneva, Arial, Helvetica, sans-serif”;
title.style.color=titlecolor;
title.style.lineHeight=titleheight+”px”;
title.innerHTML=”<a id=close>关闭</a>”;
var button=document.createElement(”input”);//创建一个input对象(提示框按钮)
//定义input的属性,即相当于
//<input type=”button” align=”center” style=”width:100px; align:center; margin-left:250px; margin-bottom:10px;” value=”关闭”>
button.setAttribute(”type”,”button”);
button.setAttribute(”value”,”关闭”);
button.style.width=”60px”;
button.style.align=”center”;
button.style.margin=”2.5px 0px”;
button.style.cursor=”pointer”;
button.style.background=bordercolor;
button.style.border=”1px solid “+ bordercolor;
button.style.color=”white”;
button.onclick=removeObj;
var txt=document.createElement(”p”);
txt.style.align=”left”;
txt.style.width=”498px”;
txt.style.height=”140px”;
txt.style.margin=”0″;
txt.style.background=”#f7f7f7″;
txt.setAttribute(”id”,”msgTxt”);
txt.innerHTML=str;//参数值
document.body.appendChild(msgObj);//在body内添加提示框div对象msgObj
document.getElementById(”msgDiv”).appendChild(title);//在提示框div中添加标题栏对象title
document.getElementById(”msgDiv”).appendChild(txt);//在提示框div中添加提示信息对象txt
document.getElementById(”msgDiv”).appendChild(button);//在提示框div中添加按钮对象button
document.getElementById(”close”).onclick=removeObj;
document.getElementById(”close”).style.cursor=”pointer”;
function removeObj()
{
document.body.removeChild(bgObj);//删除背景层Div
document.body.removeChild(msgObj);//删除提示框层
}
}
</script>
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