How do I center a DIV in the exact center of a page using jQuery?
I need to center a DIV in the exact center of a page using jquery. My CSS style for the DIV is as follows:
#page-content #center-box{
position:absolute;
width:400px;
height:500px;
background:#C0C0C0;
border:1px solid #000;
}
and my jQuery for centering is as follows:
windowheight = $(window).height();
windowwidth = $(window).width();
pagecenterW = windowwidth/2;
pagecenterH = windowheight/2;
$("div#page-conte开发者_开发问答nt div#center-box")
.css({top: pagecenterH-250 + 'px', left: pagecenterW-200 + 'px'});
This code does not invoke any action on my page when refreshed. What am I doing wrong?
Try this: Working Example
Make sure you don't have any styles on #page-content that are constraining center-box and try putting your jquery code in the document ready event.
/*CSS*/
#center-box{
position:absolute;
width:400px;
height:500px;
background:#C0C0C0;
border:1px solid #000;
}
/*js*/
$(document).ready(function(){
var windowheight = $(window).height();
var windowwidth = $(window).width();
var pagecenterW = windowwidth/2;
var pagecenterH = windowheight/2;
$("div#center-box")
.css({top: pagecenterH-250 + 'px', left: pagecenterW-200 + 'px'});
});
/*html*/
<body>
<div id="center-box">
</div>
</body>
Id start with removing the + 'px' or add round brackets around pagecenterH-250 and pagecenterW-200.
What you are doing there is int + int - string.
Using absolute, the box position does not change on window resize (landscape to portrait for example). Use fixed instead. See jQuery center element to viewport using center plugin for a basic example.
加载中,请稍侯......
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