怎么让JS弹出的层绝对屏幕居中
如何让JS弹出的层绝对屏幕居中
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
/*弹出层的STYLE*/
html,body {height:100%; margin:0px; font-size:12px;}
.mydiv {
background-color: #ff6;
border: 1px solid #f90;
text-align: center;
line-height: 40px;
font-size: 12px;
font-weight: bold;
z-index:99;
width: 300px;
height: 120px;
left:50%;/*FF IE7*/
top: 50%;/*FF IE7*/
margin-left:-150px!important;/*FF IE7 该值为本身宽的一半 */
margin-top:-60px!important;/*FF IE7 该值为本身高的一半*/
margin-top:0px;
position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
}
.bg {
background-color: #ccc;
width: 100%;
height: 100%;
left:0;
top:0;/*FF IE7*/
filter:alpha(opacity=50);/*IE*/
opacity:0.5;/*FF*/
z-index:1;
position:fixed!important;/*FF IE7*/
position:absolute;/*IE6*/
_top: expression(eval(document.compatMode &&
document.compatMode=='CSS1Compat') ?
documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/
document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
}
/*The END*/
</style>
<script type="text/javascript">
function showDiv(){
document.getElementById('popDiv').style.display='block';
document.getElementById('bg').style.display='block';
}
function closeDiv(){
document.getElementById('popDiv').style.display='none';
document.getElementById('bg').style.display='none';
}
</script>
</head>
<body>
<div id="popDiv" class="mydiv" style="display:none;">恭喜你！<br/>你的成绩为:60分<br/>
<a href="javascript:closeDiv()">关闭窗口</a></div>
<div id="bg" class="bg" style="display:none;"></div>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
<div style="padding-top: 20px;">
<input type="Submit" name="" value="显示层" onclick="javascript:showDiv()" />
</div>
</body>
</html>
第二种
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 仿LightBox内容显示效果</title>
</head>
<body>
<script>
var isIE = (document.all) ? true : false;
var isIE6 = isIE && ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);
var $ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
create: function() {
return function() { this.initialize.apply(this, arguments); }
}
}
var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
}
var Bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}
var Each = function(list, fun){
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
var Contains = function(a, b){
return a.contains ? a != b && a.contains(b) : !!(a.compareDocumentPosition(b) & 16);
}
var OverLay = Class.create();
OverLay.prototype = {
initialize: function(options) {
this.SetOptions(options);
this.Lay = $(this.options.Lay) || document.body.insertBefore(document.createElement("div"), document.body.childNodes[0]);
this.Color = this.options.Color;
this.Opacity = parseInt(this.options.Opacity);
this.zIndex = parseInt(this.options.zIndex);
with(this.Lay.style){ display = "none"; zIndex = this.zIndex; left = top = 0; position = "fixed"; width = height = "100%"; }
if(isIE6){
this.Lay.style.position = "absolute";
//ie6设置覆盖层大小程序
this._resize = Bind(this, function(){
this.Lay.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
this.Lay.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
});
//遮盖select
this.Lay.innerHTML = '<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;filter:alpha(opacity=0);"></iframe>'
}
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Lay: null,//覆盖层对象
Color: "#fff",//背景色
Opacity: 50,//透明度(0-100)
zIndex: 1000//层叠顺序
};
Extend(this.options, options || {});
},
//显示
Show: function() {
//兼容ie6
if(isIE6){ this._resize(); window.attachEvent("onresize", this._resize); }
//设置样式
with(this.Lay.style){
//设置透明度
isIE ? filter = "alpha(opacity:" + this.Opacity + ")" : opacity = this.Opacity / 100;
backgroundColor = this.Color; display = "block";
}
},
//关闭
Close: function() {
this.Lay.style.display = "none";
if(isIE6){ window.detachEvent("onresize", this._resize); }
}
};
var LightBox = Class.create();
LightBox.prototype = {
initialize: function(box, options) {
this.Box = $(box);//显示层
this.OverLay = new OverLay(options);//覆盖层
this.SetOptions(options);
this.Fixed = !!this.options.Fixed;
this.Over = !!this.options.Over;
this.Center = !!this.options.Center;
this.onShow = this.options.onShow;
this.Box.style.zIndex = this.OverLay.zIndex + 1;
this.Box.style.display = "none";
//兼容ie6用的属性
if(isIE6){
this._top = this._left = 0; this._select = [];
this._fixed = Bind(this, function(){ this.Center ? this.SetCenter() : this.SetFixed(); });
}
},
//设置默认属性
SetOptions: function(options) {
this.options = {//默认值
Over: true,//是否显示覆盖层
Fixed: false,//是否固定定位
Center: false,//是否居中
onShow: function(){}//显示时执行
};
Extend(this.options, options || {});
},
//兼容ie6的固定定位程序
SetFixed: function(){
this.Box.style.top = document.documentElement.scrollTop - this._top + this.Box.offsetTop + "px";
this.Box.style.left = document.documentElement.scrollLeft - this._left + this.Box.offsetLeft + "px";
this._top = document.documentElement.scrollTop; this._left = document.documentElement.scrollLeft;
},
//兼容ie6的居中定位程序
SetCenter: function(){
this.Box.style.marginTop = document.documentElement.scrollTop - this.Box.offsetHeight / 2 + "px";
this.Box.style.marginLeft = document.documentElement.scrollLeft - this.Box.offsetWidth / 2 + "px";
},
//显示
Show: function(options) {
//固定定位
this.Box.style.position = this.Fixed && !isIE6 ? "fixed" : "absolute";
//覆盖层
this.Over && this.OverLay.Show();
this.Box.style.display = "block";
//居中
if(this.Center){
this.Box.style.top = this.Box.style.left = "50%";
//设置margin
if(this.Fixed){
this.Box.style.marginTop = - this.Box.offsetHeight / 2 + "px";
this.Box.style.marginLeft = - this.Box.offsetWidth / 2 + "px";
}else{
this.SetCenter();
}
}
//兼容ie6
if(isIE6){
if(!this.Over){
//没有覆盖层ie6需要把不在Box上的select隐藏
this._select.length = 0;
Each(document.getElementsByTagName("select"), Bind(this, function(o){
if(!Contains(this.Box, o)){ o.style.visibility = "hidden"; this._select.push(o); }
}))
}
//设置显示位置
this.Center ? this.SetCenter() : this.Fixed && this.SetFixed();
//设置定位
this.Fixed && window.attachEvent("onscroll", this._fixed);
}
this.onShow();
},
//关闭
Close: function() {
this.Box.style.display = "none";
this.OverLay.Close();
if(isIE6){
window.detachEvent("onscroll", this._fixed);
Each(this._select, function(o){ o.style.visibility = "visible"; });
}
}
};
</script>
<style>
.lightbox{width:300px;background:#FFFFFF;border:1px solid #ccc;line-height:25px; top:20%; left:20%;}
.lightbox dt{background:#f4f4f4; padding:5px;}
</style>
<dl id="idBox" class="lightbox">
<dt id="idBoxHead"><b>LightBox</b> </dt>
<dd>
内容显示
<br /><br />
<input name="" type="button" value=" 关闭 " id="idBoxCancel" />
<br /><br />
</dd>
</dl>
<div style="margin:0 auto; width:800px; height:500px; border:1px solid #000000;">
<input type="button" value="关闭覆盖层" id="btnOverlay" />
<input type="button" value="黑色覆盖层" id="btnOverColor" />
<input type="button" value="全透覆盖层" id="btnOverOpacity" />
<input type="button" value="定位效果" id="btnFixed" />
<input type="button" value="居中效果" id="btnCenter" />
<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
<select>
<option>覆盖select测试</option>
</select>
<input name="" type="button" value=" 打开 " id="idBoxOpen" />
</div>
<script>
var box = new LightBox("idBox");
$("idBoxCancel").onclick = function(){ box.Close(); }
$("idBoxOpen").onclick = function(){ box.Show(); }
$("btnOverlay").onclick = function(){
box.Close();
if(box.Over){
box.Over = false;
this.value = "打开覆盖层";
} else {
box.Over = true;
this.value = "关闭覆盖层";
}
}
$("btnOverColor").onclick = function(){
box.Close();
box.Over = true;
if(box.OverLay.Color == "#fff"){
box.OverLay.Color = "#000";
this.value = "白色覆盖层";
} else {
box.OverLay.Color = "#fff"
this.value = "黑色覆盖层";
}
}
$("btnOverOpacity").onclick = function(){
box.Close();
box.Over = true;
if(box.OverLay.Opacity == 0){
box.OverLay.Opacity = 50;
this.value = "全透覆盖层";
} else {
box.OverLay.Opacity = 0;
this.value = "半透覆盖层";
}
}
$("btnFixed").onclick = function(){
box.Close();
if(box.Fixed){
box.Fixed = false;
this.value = "定位效果";
} else {
box.Fixed = true;
this.value = "取消定位";
}
}
$("btnCenter").onclick = function(){
box.Close();
if(box.Center){
box.Center = false;
box.Box.style.left = box.Box.style.top = "20%";
box.Box.style.marginTop = box.Box.style.marginLeft = "0";
this.value = "居中效果";
} else {
box.Center = true;
this.value = "重新定位";
}
}
</script>
</body>
</html>