如何在包含div
内部对齐图像?
在我的示例中,我需要使用class ="frame
” 将<img>
在<div>
垂直居中:
<div class="frame" style="height: 25px;">
<img src="http://jsfiddle.net/img/logo.png" />
</div>
.frame
的高度是固定的,图像的高度是未知的。如果这是唯一的解决方案,则可以在.frame
添加新元素。我正在尝试在 Internet Explorer 7 和更高版本的 WebKit,Gecko 上执行此操作。
在这里查看 jsfiddle。
.frame {
height: 25px; /* Equals maximum image height */
line-height: 25px;
width: 160px;
border: 1px solid red;
text-align: center;
margin: 1em 0;
}
img {
background: #3A6F9A;
vertical-align: middle;
max-height: 25px;
max-width: 160px;
}
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=250 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=25 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=23 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=21 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=19 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=17 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=15 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=13 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=11 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=9 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=7 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=5 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=3 />
</div>
据我所知,唯一(也是最好的跨浏览器)方法是在两个元素上使用height: 100%
和vertical-align: middle
的inline-block
帮助器。
因此,有一个解决方案: http : //jsfiddle.net/kizu/4RPFa/4570/
.frame {
height: 25px; /* Equals maximum image height */
width: 160px;
border: 1px solid red;
white-space: nowrap; /* This is required unless you put the helper span closely near the img */
text-align: center;
margin: 1em 0;
}
.helper {
display: inline-block;
height: 100%;
vertical-align: middle;
}
img {
background: #3A6F9A;
vertical-align: middle;
max-height: 25px;
max-width: 160px;
}
<div class="frame">
<span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=250px />
</div>
<div class="frame">
<span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=25px />
</div>
<div class="frame">
<span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=23px />
</div>
<div class="frame">
<span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=21px />
</div>
<div class="frame">
<span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=19px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=17px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=15px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=13px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=11px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=9px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=7px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=5px />
</div>
<div class="frame">
<span class="helper"></span>
<img src="http://jsfiddle.net/img/logo.png" height=3px />
</div>
或者,如果您不想在现代浏览器中添加多余的元素并且不介意使用 Internet Explorer 表达式,则可以使用伪元素,然后使用方便的表达式将其添加到 Internet Explorer,该表达式每个元素仅运行一次,因此不会有任何性能问题:
Internet Explorer 的: :before
和expression()
解决方案: http : //jsfiddle.net/kizu/4RPFa/4571/
.frame {
height: 25px; /* Equals maximum image height */
width: 160px;
border: 1px solid red;
white-space: nowrap;
text-align: center;
margin: 1em 0;
}
.frame:before,
.frame_before {
content: "";
display: inline-block;
height: 100%;
vertical-align: middle;
}
img {
background: #3A6F9A;
vertical-align: middle;
max-height: 25px;
max-width: 160px;
}
/* Move this to conditional comments */
.frame {
list-style:none;
behavior: expression(
function(t){
t.insertAdjacentHTML('afterBegin','<span class="frame_before"></span>');
t.runtimeStyle.behavior = 'none';
}(this)
);
}
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=250px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=25px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=23px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=21px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=19px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=17px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=15px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=13px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=11px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=9px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=7px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=5px /></div>
<div class="frame"><img src="http://jsfiddle.net/img/logo.png" height=3px /></div>
怎么运行的:
当您有两个彼此相邻的inline-block
元素时,您可以使它们彼此对齐,因此,使用vertical-align: middle
您将得到如下所示的内容:
当您使用固定高度的块(以px
, em
或其他绝对单位表示)时,可以将内部块的高度设置为%
。
height: 100%
inline-block
height: 100%
在高度固定的块中height: 100%
将使其中的另一个inline-block
元素(在您的情况下为<img/>
)垂直对齐。 这可能有用:
div {
position: relative;
width: 200px;
height: 200px;
}
img {
position: absolute;
top: 0;
bottom: 0;
margin: auto;
}
.image {
min-height: 50px
}
matejkramny 的解决方案是一个不错的开始,但是过大的图像比例错误。
这是我的叉子:
演示: https : //jsbin.com/lidebapomi/edit?html,css,输出
HTML:
<div class="frame">
<img src="foo"/>
</div>
CSS:
.frame {
height: 160px; /* Can be anything */
width: 160px; /* Can be anything */
position: relative;
}
img {
max-height: 100%;
max-width: 100%;
width: auto;
height: auto;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
纯 CSS 解决方案:
.frame {
margin: 1em 0;
height: 35px;
width: 160px;
border: 1px solid red;
position: relative;
}
img {
max-height: 25px;
max-width: 160px;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
background: #3A6F9A;
}
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=250 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=25 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=23 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=21 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=19 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=17 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=15 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=13 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=11 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=9 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=7 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=5 />
</div>
<div class=frame>
<img src="http://jsfiddle.net/img/logo.png" height=3 />
</div>
关键的东西
// position: relative; - in .frame holds the absolute element within the frame
// top: 0; bottom: 0; left: 0; right: 0; - this is key for centering a component
// margin: auto; - centers the image horizontally & vertically
对于更现代的解决方案,如果不需要支持旧版浏览器,则可以执行以下操作:
.frame {
display: flex;
/**
Uncomment 'justify-content' below to center horizontally.
✪ Read below for a better way to center vertically and horizontally.
**/
/* justify-content: center; */
align-items: center;
}
img {
height: auto;
/**
✪ To center this image both vertically and horizontally,
in the .frame rule above comment the 'justify-content'
and 'align-items' declarations,
then uncomment 'margin: auto;' below.
**/
/* margin: auto; */
}
/* Styling stuff not needed for demo */
.frame {
max-width: 900px;
height: 200px;
margin: auto;
background: #222;
}
p {
max-width: 900px;
margin: 20px auto 0;
}
img {
width: 150px;
}
<div class="frame">
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/9988/hand-pointing.png">
</div>
这是一支钢笔: http : //codepen.io/ricardozea/pen/aa0ee8e6021087b6e2460664a0fa3f3e
这样,您可以将图像垂直居中( demo ):
div{
height: 150px; // Internet Explorer 7 fix
line-height: 150px;
}
img{
vertical-align: middle;
margin-bottom: 0.25em;
}
另外,您可以使用 Flexbox 获得正确的结果:
.parent {
align-items: center; /* For vertical align */
background: red;
display: flex;
height: 250px;
/* justify-content: center; <- for horizontal align */
width: 250px;
}
<div class="parent">
<img class="child" src="https://cdn2.iconfinder.com/data/icons/social-icons-circular-black/512/stackoverflow-128.png" />
</div>
flexbox有一个超级简单的解决方案!
.frame {
display: flex;
align-items: center;
}
您可以尝试将 PI 的 CSS 设置为display: table-cell; vertical-align: middle;