Flexbox：水平和垂直居中

Tom猿2020-03-17

如何使用flexbox在容器内水平和垂直居中div。在下面的示例中，我希望每个数字都彼此相邻（按行），并水平居中。

.flex-container {
  padding: 0;
  margin: 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
row {
  width: 100%;
}
.flex-item {
  background: tomato;
  padding: 5px;
  width: 200px;
  height: 150px;
  margin: 10px;
  line-height: 150px;
  color: white;
  font-weight: bold;
  font-size: 3em;
  text-align: center;
}

<div class="flex-container">
  <div class="row">
    <span class="flex-item">1</span>
  </div>
  <div class="row">
    <span class="flex-item">2</span>
  </div>
  <div class="row">
    <span class="flex-item">3</span>
  </div>
  <div class="row">
    <span class="flex-item">4</span>
  </div>
</div>

http://codepen.io/anon/pen/zLxBo

GilLEY2020/03/17 15:31:28

使用CSS +

<div class="EXTENDER">
  <div class="PADDER-CENTER">
    <div contentEditable="true">Edit this text...</div>
  </div>
</div>

在这里看看

Stafan逆天前端2020/03/17 15:31:28

结果：

码

HTML：

<div class="flex-container">
  <div class="rows">

    <div class="row">
      <span class="flex-item">1</span>
    </div>
    <div class="row">
      <span class="flex-item">2</span>
    </div>
    <div class="row">
      <span class="flex-item">3</span>
    </div>
    <div class="row">
      <span class="flex-item">4</span>
    </div>

  </div>  
</div>

CSS：

html, body {
  height: 100%;  
}

.flex-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.rows {
  display: flex;
  flex-direction: column;
}

其中flex-containerdiv用于将div垂直和水平居中rows，而rowsdiv用于对“项目”进行分组并在基于列的列中对其进行排序。

Harry小卤蛋2020/03/17 15:31:28

margin: auto与flexbox完美搭配。它垂直和水平居中。

html, body {
  height: 100%;
  max-height: 100%;
}

.flex-container {
  display: flex;
    
  height: 100%;
  background-color: green;
}

.container {
  display: flex;
  margin: auto;
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS</title>
</head>
<body>
  <div class="flex-container">
    <div class="container">
      <div class="row">
        <span class="flex-item">1</span>
      </div>
      <div class="row">
        <span class="flex-item">2</span>
      </div>
      <div class="row">
        <span class="flex-item">3</span>
      </div>
     <div class="row">
        <span class="flex-item">4</span>
    </div>
  </div>  
</div>
</body>
</html>

古一泡芙猴子2020/03/17 15:31:28

如果您需要在链接中居中放置文本，则可以做到这一点：

div {
  display: flex;

  width: 200px;
  height: 80px;
  background-color: yellow;
}

a {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center; /* only important for multiple lines */

  padding: 0 20px;
  background-color: silver;
  border: 2px solid blue;
}

<div>
  <a href="#">text</a>
  <a href="#">text with two lines</a>
</div>

Stafan小哥2020/03/17 15:31:28

diplay: flex;因为它是容器，而且margin:auto;它的项目也很完美。

注意：您必须设置width和height才能看到效果。

#container{
  width: 100%; /*width needs to be setup*/
  height: 150px; /*height needs to be setup*/
  display: flex;
}

.item{
  margin: auto; /*These will make the item in center*/
  background-color: #CCC;
}

<div id="container">
   <div class="item">CENTER</div>
</div>

古一阿飞2020/03/17 15:31:28

你可以利用

display: flex; align-items: center; justify-content: center;

在您的父组件上

https://repl.it/repls/TomatoImaginaryInitialization

小宇宙猪猪2020/03/17 15:31:28

1-将父div上的CSS设置为 display: flex;

2-将父div上的CSS设置为flex-direction: column;
注意，这将使该div中的所有内容从上到下对齐。如果父div仅包含子对象而不包含其他子元素，则此方法效果最佳。

3-将父div上的CSS设置为 justify-content: center;

这是CSS外观的示例：

.parentDivClass {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

斯丁番长2020/03/17 15:31:27

不要忘记使用重要的浏览器特定属性：

align-items：居中; ->

-webkit-box-align: center;
-moz-box-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
align-items: center;

证明内容：中心；->

-webkit-box-pack: center;
-moz-box-pack: center;
-ms-flex-pack: center;
-webkit-justify-content: center;
justify-content: center;

You could read this two links for better understanding flex: http://css-tricks.com/almanac/properties/j/justify-content/ and http://ptb2.me/flexbox/

Good Luck.

L西里2020/03/17 15:31:27

加

.container {
    display: flex;
    justify-content: center;
    align-items: center;
}

到您想居中放置的容器元素。文档：证明内容和对齐项目。

乐A2020/03/17 15:31:27

我认为您想要以下内容。

html, body {
    height: 100%;
}
body {
    margin: 0;
}
.flex-container {
    height: 100%;
    padding: 0;
    margin: 0;
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    align-items: center;
    justify-content: center;
}
.row {
    width: auto;
    border: 1px solid blue;
}
.flex-item {
    background-color: tomato;
    padding: 5px;
    width: 20px;
    height: 20px;
    margin: 10px;
    line-height: 20px;
    color: white;
    font-weight: bold;
    font-size: 2em;
    text-align: center;
}

<div class="flex-container">
    <div class="row"> 
        <div class="flex-item">1</div>
        <div class="flex-item">2</div>
        <div class="flex-item">3</div>
        <div class="flex-item">4</div>
    </div>
</div>

参见演示：http : //jsfiddle.net/audetwebdesign/tFscL/

Your .flex-item elements should be block level (div instead of span) if you want the height and top/bottom padding to work properly.

Also, on .row, set the width to auto instead of 100%.

Your .flex-container properties are fine.

If you want the .row to be centered vertically in the view port, assign 100% height to html and body, and also zero out the body margins.

Note that .flex-container needs a height to see the vertical alignment effect, otherwise, the container computes the minimum height needed to enclose the content, which is less than the view port height in this example.

Footnote:
The flex-flow, flex-direction, flex-wrap properties could have made this design easier to implement. I think that the .row container is not needed unless you want to add some styling around the elements (background image, borders and so on).

A useful resource is: http://demo.agektmr.com/flexbox/

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