js实现弹出层居中显示背景变灰效果

2016-12-04 网页编程网 网页编程网

<HTML>
<HEAD>
<META http-equiv=content-type content="application/xhtml+xml; charset=gb2312" />
<TITLE>浮动层居中效果</TITLE>
<STYLE type=text/css>
HTML {
HEIGHT: 100%
}
BODY {
HEIGHT: 100%
}
BODY {
FONT-SIZE: 14px; FONT-FAMILY: Tahoma, Verdana, sans-serif
}
DIV.neat-dialog-cont {
Z-INDEX: 98; BACKGROUND: none transparent scroll repeat 0% 0%; LEFT: 0px; WIDTH: 100%; POSITION: absolute; TOP: 0px; HEIGHT: 100%
}
DIV.neat-dialog-bg {
Z-INDEX: -1; FILTER: alpha(opacity=70); LEFT: 0px; WIDTH: 100%; POSITION: absolute; TOP: 0px; HEIGHT: 100%; BACKGROUND-COLOR: #eee; opacity: 0.7
}
DIV.neat-dialog {
BORDER-RIGHT: #555 1px solid; BORDER-TOP: #555 1px solid; Z-INDEX: 99; MARGIN-LEFT: auto; BORDER-LEFT: #555 1px solid; WIDTH: 30%; MARGIN-RIGHT: auto; BORDER-BOTTOM: #555 1px solid; POSITION: relative; TOP: 25%; BACKGROUND-COLOR: #fff
}
DIV.neat-dialog-title {
PADDING-RIGHT: 0.3em; PADDING-LEFT: 0.3em; FONT-SIZE: 0.8em; PADDING-BOTTOM: 0.1em; MARGIN: 0px; LINE-HEIGHT: 1.2em; PADDING-TOP: 0.1em; BORDER-BOTTOM: #444 1px solid; POSITION: relative
}
IMG.nd-cancel {
RIGHT: 0.2em; POSITION: absolute; TOP: 0.2em
}
DIV.neat-dialog P {
PADDING-RIGHT: 0.2em; PADDING-LEFT: 0.2em; PADDING-BOTTOM: 0.2em; PADDING-TOP: 0.2em; TEXT-ALIGN: center
}
</STYLE>
<SCRIPT type=text/javascript>
function NeatDialog(wwwnet, sTitle, bCancel){
window.neatDialog = null;
this.elt = null;
if (document.createElement && document.getElementById){
    var dg = document.createElement("div");
    dg.className = "neat-dialog";
    if (sTitle)
      wwwnet = '<div class="neat-dialog-title">'+sTitle+
              ((bCancel)?
                '<img src="x.gif" alt="Cancel" class="nd-cancel" />':'')+
                '</div>\n' + wwwnet;
    dg.innerHTML = wwwnet;
    var dbg = document.createElement("div");
    dbg.id = "nd-bdg";
    dbg.className = "neat-dialog-bg";
    var dgc = document.createElement("div");
    dgc.className = "neat-dialog-cont";
    dgc.appendChild(dbg);
    dgc.appendChild(dg);
    //adjust positioning if body has a margin
    if (document.body.offsetLeft > 0)
      dgc.style.marginLeft = document.body.offsetLeft + "px";
    document.body.appendChild(dgc);
    if (bCancel) document.getElementById("nd-cancel").onclick = function(){
      window.neatDialog.close();
    };
    this.elt = dgc;
    window.neatDialog = this;
}
}
NeatDialog.prototype.close = function(){
if (this.elt)
{
    this.elt.style.display = "none";
    this.elt.parentNode.removeChild(this.elt);
}
window.neatDialog = null;
}
function openDialog(){
var wwwnet = '<p>欢迎各位来到<br/>有你们的支持，我们会做得更好<br/> <a href="http://#">超链接网</a>，专注于就是这么简单。</p>'+
      '<p><button onclick="window.neatDialog.close()">关闭</button></p>';
    new NeatDialog(wwwnet, "噢噢噢，这个是弹出的层", false);
}
</SCRIPT>
<BODY>
<H1>浮动层居中效果，点击下面按钮看效果。</H1>
<BUTTON onclick="openDialog()">点此演示效果</BUTTON>
</BODY>
</HTML>

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