html - Flex-grow 不适用于列方向
问题描述
我正在尝试学习 flexbox 布局。我看到一个教程谈到了 flex-grow 和 flex-shrink 类,并且本课程中提供的所有示例都适用于 flex-direction: row。
我试图用 应用它们flex-direction: column
,但它没有按我的意愿工作。我用谷歌搜索了它,但是当将方向设置为列时,我没有找到合适的答案来增加弹性项目。
我的代码如下。任何人都可以修复我的 CSS 以在列方向上进行 flex-grow/shrink 工作吗?
html,
body {
padding: 0;
margin: 0;
font-family: arial, sans-serif;
}
.flex-container {
display: flex;
border:solid 4px #000;
flex-direction: column;
height: 100%;
}
.flex-item {
color: #eee;
font-size: 1.2em;
padding: 1em;
text-align: center;
justify-content: center;
flex-grow: 1;
}
.flex-item:nth-child(1) {
background-color: #A62E5C;
flex-grow: 3;
}
.flex-item:nth-child(2) {
background-color: #9BC850;
}
.flex-item:nth-child(3) {
background-color: #675BA7;
}
.flex-item:nth-child(4) {
background-color: #620542;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div class="container-fluid">
<div class="flex-container">
<div class="flex-item">Flex 1</div>
<div class="flex-item">Flex 2</div>
<div class="flex-item">Flex 3</div>
<div class="flex-item">Flex 4</div>
</div>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</html>
解决方案
它可以工作,但您不会看到任何不同,因为flex-grow
将考虑使元素增长的可用空间,并且默认情况下,列方向没有可用空间,因为高度由内容定义,这与使用宽度为的行方向时不同通常是 100%,我们有可用空间。
此外,在您使用的情况下height:100%
,由于父元素上没有定义高度,auto
因此它将回退到内容的高度,并且上述逻辑将适用。
使用固定高度,你会看到效果:
html,
body {
padding: 0;
margin: 0;
font-family: arial, sans-serif;
}
.flex-container {
display: flex;
border: solid 4px #000;
flex-direction: column;
height: 600px;
}
.flex-item {
color: #eee;
font-size: 1.2em;
padding: 1em;
text-align: center;
justify-content: center;
flex-grow: 1;
}
.flex-item:nth-child(1) {
background-color: #A62E5C;
flex-grow: 3;
}
.flex-item:nth-child(2) {
background-color: #9BC850;
}
.flex-item:nth-child(3) {
background-color: #675BA7;
}
.flex-item:nth-child(4) {
background-color: #620542;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div class="container-fluid">
<div class="flex-container">
<div class="flex-item">Flex 1</div>
<div class="flex-item">Flex 2</div>
<div class="flex-item">Flex 3</div>
<div class="flex-item">Flex 4</div>
</div>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</html>
为了解决这个问题,height:100%
您需要将其添加到父元素:
html,
body {
padding: 0;
margin: 0;
font-family: arial, sans-serif;
height: 100%;
}
.container-fluid {
height: 100%;
}
.flex-container {
display: flex;
border: solid 4px #000;
flex-direction: column;
height: 100%;
}
.flex-item {
color: #eee;
font-size: 1.2em;
padding: 1em;
text-align: center;
justify-content: center;
flex-grow: 1;
}
.flex-item:nth-child(1) {
background-color: #A62E5C;
flex-grow: 3;
}
.flex-item:nth-child(2) {
background-color: #9BC850;
}
.flex-item:nth-child(3) {
background-color: #675BA7;
}
.flex-item:nth-child(4) {
background-color: #620542;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div class="container-fluid">
<div class="flex-container">
<div class="flex-item">Flex 1</div>
<div class="flex-item">Flex 2</div>
<div class="flex-item">Flex 3</div>
<div class="flex-item">Flex 4</div>
</div>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</html>
flex-grow CSS 属性指定弹性项目的弹性增长因子。它指定应该将弹性容器中的可用空间分配给该项目。参考
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