无论屏幕分辨率如何，我如何居中 javascript css popup div?
时间：2023-10-01问题描述
我有以下代码在禁用背景的同时打开一个新的弹出窗口，问题是我必须定位它，使其距离顶部 100px(已经通过 CSS #dialog 得到)并且也在中心屏幕，不管用户的分辨率是多少?
I have the following code that opens a new popup window while disabling the background, the problem is that I have to position this so that it's 100px from the top (already got that through the CSS #dialog) and also in the center of the screen, no matter what the user's resolution is?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function showPopUp(el) {
var cvr = document.getElementById("cover")
var dlg = document.getElementById(el)
cvr.style.display = "block"
dlg.style.display = "block"
if (document.body.style.overflow = "hidden") {
cvr.style.width = "1024"
cvr.style.height = "100%"
}
}
function closePopUp(el) {
var cvr = document.getElementById("cover")
var dlg = document.getElementById(el)
cvr.style.display = "none"
dlg.style.display = "none"
document.body.style.overflowY = "scroll"
}
</script>
<style type="text/css">
#cover {
display: none;
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
background: gray;
filter: alpha(Opacity = 50);
opacity: 0.5;
-moz-opacity: 0.5;
-khtml-opacity: 0.5
}
#dialog {
display: none;
left: 100px;
top: 100px;
width: 300px;
height: 300px;
position: absolute;
z-index: 100;
background: white;
padding: 2px;
font: 10pt tahoma;
border: 1px solid gray
}
</style>
</head>
<body>
<div id="cover"></div>
<div id="dialog">
My Dialog Content
<br><input type="text">
<br><input type="button" value="Submit">
<br><a href="#" onclick="closePopUp('dialog');">[Close]</a>
</div>
<a href="#" onclick="showPopUp('dialog');">Show</a>
</body>
</html>
推荐答案
基于CSS的解决方案居中:
您需要使用这些样式来使其显得死心:
You need to use these styles to make it appear dead-center:
position:absolute;
top:50%;
left:50%;
width:400px; /* adjust as per your needs */
height:400px; /* adjust as per your needs */
margin-left:-200px; /* negative half of width above */
margin-top:-200px; /* negative half of height above */
所以应该指定position.top 和 left 应该是 50%.margin-left 和 margin-top 应该分别是盒子宽度和高度的负值的一半.
So position should be specified. The top and left should be 50%. The margin-left and margin-top should be negative one half of the width and height of the box respectively.
请注意，如果您希望您的弹出窗口即使在页面滚动时也显示在中心，您将不得不使用 position:fixed 来代替它在 IE6 中不起作用的缺点.
Notice that if you want your popup to appear on center even when page is scrolled you will have to use position:fixed instead with the draw back that it doesn't work in IE6.
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