Vertical centering variable height image while maintaining max-width/height
I want to center an image of unknown width/height on a page, while making sure that it shrinks if it is bigger than the page (i.e. use max-width/max-height).
I tried using the display:table-cell method, but max-width is ignored in Firefox for all elements within elements declared with display:table-cell. Is there a way to vertically center a variable-height element without using display:table-cell?
I can c开发者_如何学编程hange the mark up. JavaScript is acceptable, but I cannot use JQuery (or any other JS library).
This should prove to work quite well... no JavaScript necessary :)
See the working demo on jsFiddle.
CSS
/* Don't Change - Positioning */
.absoluteCenter {
margin:auto;
position:absolute;
top:0;
bottom:0;
left:0;
right:0;
}
/* Sizing */
img.absoluteCenter {
max-height:100%;
max-width:100%;
}
HTML
<img class="absoluteCenter" src="PATHTOIMAGE">
Note: This class can be used for anything quite easily. If you use this for something other than an image, make sure to add a TAG.absoluteCenter CSS rule with a max-height and max-width of your choosing (where TAG is the HTML tag you're using [e.g. div.absoluteCenter] and max-width/max-height is less than 100%).
Try something like this...
Demo: http://jsfiddle.net/wdm954/jYnk8/1/
$(function() {
h = $('.img').height();
w = $(window).height();
if (h < w) {
$('.img').css('margin-top', (w - h) /2 + "px");
}
else {
$('.img').height(w);
}
});
(You can test different sizes by changing some CSS I have commented out.)
Here is one way with javascript:
<html>
<head>
<style>
html, body{
height:100%;
margin:0;
border:0;
padding:0;
background:#000;
}
body{
position:relative;
}
img{
border:0;
padding:0;
margin:0 auto;
max-width:100%;
max-height:100%;
display:block;
position:absolute;
}
</style>
</head>
<body>
<img />
<script>
(function(){
var imgs = [
'http://farm3.static.flickr.com/2396/2078094921_ee60c42d0f.jpg',
'http://farm6.static.flickr.com/5242/5353846171_9169f810dc_b.jpg',
'http://farm6.static.flickr.com/5284/5336493514_8e41696b66_b.jpg'
],
img = document.getElementsByTagName('IMG')[0],
getStyle = function(elm){
return window.getComputedStyle ? window.getComputedStyle(elm) : elm.currentStyle;
},
bodyStyle = getStyle(document.body),
toInt = function(pxSize){
return +pxSize.replace(/px/,'');
},
chgImg = function(){
img.src = imgs[i++ % imgs.length];
img.onload = function(){
var imgStyle = getStyle(img);
img.style.left = ( toInt(bodyStyle.width) - toInt(imgStyle.width) ) / 2 + 'px';
img.style.top = ( toInt(bodyStyle.height) - toInt(imgStyle.height) ) / 2 + 'px';
img.onload = null;
};
},
i = 0;
chgImg();
setInterval(chgImg, 3000);
})();
</script>
</body>
</html>
加载中,请稍侯......
精彩评论