使外部 div 自动与其浮动内容的高度相同

我想要的外部 div，这是黑色的包装其 div漂浮在它。我不想在 div中使用 style='height: 200px和 outerdiv id，因为我希望它自动是其内容的高度(例如，浮动的 div)。

<div id='outerdiv' style='border: 1px solid black;background-color: black;'>
<div style='width=300px;border: red 1px dashed;float: left;'>
<p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
</div>


<div style='width=300px;border: red 1px dashed;float: right;'>
<p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
</div>

如何做到这一点？

106534 次浏览
小开
最佳答案

You can set the outerdiv's CSS to this

#outerdiv {
overflow: hidden; /* make sure this doesn't cause unexpected behaviour */
}

You can also do this by adding an element at the end with clear: both. This can be added normally, with JS (not a good solution) or with :after CSS pseudo element (not widely supported in older IEs).

The problem is that containers won't naturally expand to include floated children. Be warned with using the first example, if you have any children elements outside the parent element, they will be hidden. You can also use 'auto' as the property value, but this will invoke scrollbars if any element appears outside.

You can also try floating the parent container, but depending on your design, this may be impossible/difficult.

小开

You may want to try self-closing floats, as detailed on http://www.sitepoint.com/simple-clearing-of-floats/

So perhaps try either overflow: auto (usually works), or overflow: hidden, as alex said.

小开

First of all you don't use width=300px that's an attribute setting for the tag not CSS, use width: 300px; instead.

I would suggest applying the clearfix technique on the #outerdiv. Clearfix is a general solution to clear 2 floating divs so the parent div will expand to accommodate the 2 floating divs.

<div id='outerdiv' class='clearfix' style='width:600px; background-color: black;'>
<div style='width:300px; float: left;'>
<p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
</div>


<div style='width:300px; float: left;'>
<p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
</div>
</div>

Here is an example of your situation and what Clearfix does to resolve it.

小开

Firstly, I highly recommend you do your CSS styling in an external CSS file, rather than doing it inline. It's much easier to maintain and can be more reusable using classes.

Working off Alex's answer (& Garret's clearfix) of "adding an element at the end with clear: both", you can do it like so:

    <div id='outerdiv' style='border: 1px solid black; background-color: black;'>
<div style='width: 300px; border: red 1px dashed; float: left;'>
<p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
</div>


<div style='width: 300px; border: red 1px dashed; float: right;'>
<p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
</div>
<div style='clear:both;'></div>
</div>

This works (but as you can see inline CSS isn't so pretty).

小开

Use jQuery:

Set Parent Height = Child offsetHeight.

$(document).ready(function() {
$(parent).css("height", $(child).attr("offsetHeight"));
}
小开

Use clear: both;

I spent over a week trying to figure this out!

小开

I know some people will hate me, but I've found display:table-cell to help in this cases.

It is really cleaner.


提交答案