Flexbox.避免孩子的身高比父母高(列方向)
问题描述：
我正在使用flexbox搭建网站的基本UI.非常类似于通常的电子邮件布局.
I'm scaffolding a basic UI for a site using flexbox. Quite similar to the usual email layout.
出于某种原因，列布局的flexbox容器(.content-main， plum 颜色)的第二个子类(.main-body， lightseagreen 颜色)具有较大的比它的父级高，我不想要它的高度.
For some reason the second children( class .main-body, lightseagreen color) of a column-layouted flexbox container(.content-main, plum color) has a bigger height than its parent, which I do not want it to.
我制作了一个 codepen代码段来显示这种行为.
I made a codepen snippet to show this behaviour.
html,
body {
width: 100%;
height: 100%;
background: lightblue;
box-sizing: border-box;
}
* {
box-sizing: border-box;
}
.container {
height: inherit;
background: PeachPuff;
padding: 1em;
display: flex;
max-height: 500px;
}
.sidebar {
flex: 0 1 15%;
background: khaki;
}
.content {
flex: 1 1 auto;
background: plum;
padding: 0.8em;
display: flex;
flex-direction: column;
}
.content-header {
background: lightgreen;
padding: 0.3em;
flex: 0 0 7%;
}
.content-main {
display: flex;
background: darkseagreen;
padding: 1em;
height: 100%;
flex: 1 1 auto;
}
.main-list {
flex: 0 0 12%;
background: lightcoral;
}
.main-body {
flex: 0 1 auto;
padding: 1em;
background: lightcyan;
display: flex;
flex-flow: row wrap;
overflow-y: scroll;
}
<div class='container'>
<div class='sidebar'>
<ul>
<li>Onnnne</li>
<li>Twoo</li>
<li>Threee</li>
</ul>
</div>
<div class='content'>
<div class='content-header'>
<span>This iscontent header</span>
</div>
<div class='content-main'>
<div class='main-list'>
<ul>
<li>List 1</li>
<li>List 2</li>
<li>List 3</li>
</ul>
</div>
<div class='main-body'>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
如何防止绿色孩子的身高超过其李子父母的身高?我希望孩子可以滚动但不能比父母高.
How can I prevent the green child to have bigger height than its plum parent? I want the child to just be scrollable but never taller than its parents.
答
Flexbox引入了auto作为min-height的新初始值.它使弹性项目的高度与内容的高度一样.
Flexbox introduces auto as the new initial value of min-height. It makes flex items grow as tall as their contents.
您可以通过将min-height设置为0(旧的初始值)来撤消该操作:
You can undo that by setting min-height to 0, the old initial value:
.content-main {
min-height: 0;
}
html,
body {
width: 100%;
height: 100%;
background: lightblue;
box-sizing: border-box;
}
* {
box-sizing: border-box;
}
.container {
height: inherit;
background: PeachPuff;
padding: 1em;
display: flex;
max-height: 500px;
}
.sidebar {
flex: 0 1 15%;
background: khaki;
}
.content {
flex: 1 1 auto;
background: plum;
padding: 0.8em;
display: flex;
flex-direction: column;
}
.content-header {
background: lightgreen;
padding: 0.3em;
flex: 0 0 7%;
}
.content-main {
display: flex;
background: darkseagreen;
padding: 1em;
height: 100%;
flex: 1 1 auto;
min-height: 0;
}
.main-list {
flex: 0 0 12%;
background: lightcoral;
}
.main-body {
flex: 0 1 auto;
padding: 1em;
background: lightcyan;
display: flex;
flex-flow: row wrap;
overflow-y: scroll;
}
<div class='container'>
<div class='sidebar'>
<ul>
<li>Onnnne</li>
<li>Twoo</li>
<li>Threee</li>
</ul>
</div>
<div class='content'>
<div class='content-header'>
<span>This iscontent header</span>
</div>
<div class='content-main'>
<div class='main-list'>
<ul>
<li>List 1</li>
<li>List 2</li>
<li>List 3</li>
</ul>
</div>
<div class='main-body'>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
<div class='panel'>
<table>
<thead>
<th>First</th>
<th>Second</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
<th>Third</th>
</thead>
<tbody>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>