css javascript图片自动同比例缩小并且实现垂直居中_DIV+CSS实例
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图片自动等比例缩小,其实假如不考虑ie6的话,用css就可以实现,设定img的max-width和max-height,而<img>标签内不设定widht和height即可。
ie7已经支持max-width和max-height,这是为数不多的好消息之一。 但是对于ie6及以前的版本,就只能用js来设置了。
在 ff 2.0/ ie6 / ie7 中测试通过。 opera 8.5 cn 垂直居中未通过,正在研究[貌似opera下假如只有图片行高会失效……]。希望大家来测试。
示例代码 [www.mb5u.com]
<!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>图片自动等比例缩小且垂直居中</title>
<!--[if lte IE 6]>
<script type="text/javascript" language="javascript">
function imgFix() {
//定义要限制的图片宽高,这个宽高要同style里面定义的相同,小于限定高宽的图片不操作
var widthRestriction = 200;
var heightRestriction = 200;
var allElements = document.getElementsByTagName('*')
for (var i = 0; i < allElements.length; i )
{
if (allElements[i].className.indexOf('imgBox') >= 0)
{
var imgElements = allElements[i].getElementsByTagName('img');
for (var j=0; j < imgElements.length; j )
{
if ( imgElements[j].width > widthRestriction || imgElements[j].height > heightRestriction )
{
if ( imgElements[j].width > imgElements[j].height)
{
imgElements[j].height = imgElements[j].height*(widthRestriction/imgElements[j].width);
imgElements[j].width = widthRestriction;
} else
{
imgElements[j].width = imgElements[j].width*(heightRestriction/imgElements[j].height);
imgElements[j].height = heightRestriction;
}
}
if ( imgElements[j].height < heightRestriction )
{
imgElements[j].style.paddingTop = ( heightRestriction -imgElements[j].height ) /2 "px";
}
} /*for j*/
}
}/*for i*/
}
window.onload = imgFix;
</script>
<![endif]-->
<style type="text/css">
<!--
* {
margin:0;
padding:0;
}
.imgBox li {
list-style:none;
width:200px; /* 宽度 */
height:200px; /* 高度 */
background:#ccc;
border:1px solid #666;
text-align:center;
margin:5px;
line-height:200px;
}
.imgBox img {
max-width:200px; /* 宽度 */
max-height:200px; /* 高度 */
vertical-align:middle;
}
-->
</style>
</head>
<body>
<ul class="imgBox">
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
</ul>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>图片自动等比例缩小且垂直居中</title>
<!--[if lte IE 6]>
<script type="text/javascript" language="javascript">
function imgFix() {
//定义要限制的图片宽高,这个宽高要同style里面定义的相同,小于限定高宽的图片不操作
var widthRestriction = 200;
var heightRestriction = 200;
var allElements = document.getElementsByTagName('*')
for (var i = 0; i < allElements.length; i )
{
if (allElements[i].className.indexOf('imgBox') >= 0)
{
var imgElements = allElements[i].getElementsByTagName('img');
for (var j=0; j < imgElements.length; j )
{
if ( imgElements[j].width > widthRestriction || imgElements[j].height > heightRestriction )
{
if ( imgElements[j].width > imgElements[j].height)
{
imgElements[j].height = imgElements[j].height*(widthRestriction/imgElements[j].width);
imgElements[j].width = widthRestriction;
} else
{
imgElements[j].width = imgElements[j].width*(heightRestriction/imgElements[j].height);
imgElements[j].height = heightRestriction;
}
}
if ( imgElements[j].height < heightRestriction )
{
imgElements[j].style.paddingTop = ( heightRestriction -imgElements[j].height ) /2 "px";
}
} /*for j*/
}
}/*for i*/
}
window.onload = imgFix;
</script>
<![endif]-->
<style type="text/css">
<!--
* {
margin:0;
padding:0;
}
.imgBox li {
list-style:none;
width:200px; /* 宽度 */
height:200px; /* 高度 */
background:#ccc;
border:1px solid #666;
text-align:center;
margin:5px;
line-height:200px;
}
.imgBox img {
max-width:200px; /* 宽度 */
max-height:200px; /* 高度 */
vertical-align:middle;
}
-->
</style>
</head>
<body>
<ul class="imgBox">
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
<li><img src="......" alt="img" /></li>
</ul>
</body>
</html>
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DIV+CSS实例-css javascript图片自动同比例缩小并且实现垂直居中。