如何使元素水平和垂直居中

How to center an element horizontally and vertically(如何使元素水平和垂直居中)

本文介绍了如何使元素水平和垂直居中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我试图将标签内容垂直居中,但是当我添加 CSS 样式 display:inline-flex 时,水平文本对齐消失了.

I am trying to center my tabs content vertically, but when I add the CSS style display:inline-flex, the horizontal text-align disappears.

如何为每个选项卡设置 x 和 y 文本对齐方式?

How can I make both text alignments x and y for each of my tabs?

* { box-sizing: border-box; }
#leftFrame {
  background-color: green;
  position: absolute;
  left: 0;
  right: 60%;
  top: 0;
  bottom: 0;
}
#leftFrame #tabs {
  background-color: red;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 25%;
}
#leftFrame #tabs div {
  border: 2px solid black;
  position: static;
  float: left;
  width: 50%;
  height: 100%;
  text-align: center;
  display: inline-flex;
  align-items: center;
}

<div id=leftFrame>
  <div id=tabs>
    <div>first</div>
    <div>second</div>
  </div>
</div>

推荐答案

  • 方法一 - transform translateX/translateY:

    此处示例/全屏示例

    在支持的浏览器(大部分)中,可以使用top: 50%/left: 50% 结合 translateX(-50%) translateY(-50%) 动态地垂直/水平居中元素.

    In supported browsers (most of them), you can use top: 50%/left: 50% in combination with translateX(-50%) translateY(-50%) to dynamically vertically/horizontally center the element.

    .container {
        position: absolute;
        top: 50%;
        left: 50%;
        -moz-transform: translateX(-50%) translateY(-50%);
        -webkit-transform: translateX(-50%) translateY(-50%);
        transform: translateX(-50%) translateY(-50%);
    }

    <div class="container">
        <span>I'm vertically/horizontally centered!</span>
    </div>

    • 方法 2 - Flexbox 方法:

      此处示例/全屏示例

    在支持的浏览器中,将目标元素的display设置为flex 并使用 align-items: center 进行垂直居中,使用 justify-content: center 进行水平居中.只是不要忘记添加供应商前缀以获得额外的浏览器支持(查看示例).

    In supported browsers, set the display of the targeted element to flex and use align-items: center for vertical centering and justify-content: center for horizontal centering. Just don't forget to add vendor prefixes for additional browser support (see example).

    html, body, .container {
        height: 100%;
    }
    
    .container {
        display: -webkit-flexbox;
        display: -ms-flexbox;
        display: -webkit-flex;
        display: flex;
        -webkit-flex-align: center;
        -ms-flex-align: center;
        -webkit-align-items: center;
        align-items: center;
        justify-content: center;
    }

    <div class="container"> 
      <span>I'm vertically/horizontally centered!</span>
    </div>

    • 方法3 - table-cell/vertical-align: middle:

      此处示例/全屏示例

    在某些情况下,您需要确保 html/body 元素的高度设置为 100%.

    In some cases, you will need to ensure that the html/body element's height is set to 100%.

    对于垂直对齐,将父元素的width/height设置为100%并添加display:table.然后对于子元素,将 display 更改为 table-cell 并添加 vertical-align: middle.

    For vertical alignment, set the parent element's width/height to 100% and add display: table. Then for the child element, change the display to table-cell and add vertical-align: middle.

    对于水平居中,您可以添加 text-align: center 以使文本和任何其他 inline 子元素居中.或者,您可以使用 margin: 0 auto,假设元素是 block 级别.

    For horizontal centering, you could either add text-align: center to center the text and any other inline children elements. Alternatively, you could use margin: 0 auto, assuming the element is block level.

    html, body {
        height: 100%;
    }
    .parent {
        width: 100%;
        height: 100%;
        display: table;
        text-align: center;
    }
    .parent > .child {
        display: table-cell;
        vertical-align: middle;
    }

    <section class="parent">
        <div class="child">I'm vertically/horizontally centered!</div>
    </section>

    • 方法 4 - 绝对定位 50% 距离顶部有位移:

      此处示例/全屏示例

    • Approach 4 - Absolutely positioned 50% from the top with displacement:

      Example Here / Full Screen Example

    此方法假定文本具有已知高度 - 在本例中为 18px.相对于父元素,从顶部绝对定位元素 50%.使用一个负的 margin-top 值,该值是元素已知高度的一半,在本例中为 -9px.

    This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the parent element. Use a negative margin-top value that is half of the element's known height, in this case - -9px.

    html, body, .container {
        height: 100%;
    }
    
    .container {
        position: relative;
        text-align: center;
    }
    
    .container > p {
        position: absolute;
        top: 50%;
        left: 0;
        right: 0;
        margin-top: -9px;
    }

    <div class="container">
        <p>I'm vertically/horizontally centered!</p>
    </div>

    • 方法 5 - line-height 方法(最不灵活 - 不建议):

      此处示例

    • Approach 5 - The line-height method (Least flexible - not suggested):

      Example Here

    在某些情况下,父元素会有一个固定的高度.对于垂直居中,您所要做的就是在子元素上设置一个 line-height 值,使其等于父元素的固定高度.

    In some cases, the parent element will have a fixed height. For vertical centering, all you have to do is set a line-height value on the child element equal to the fixed height of the parent element.

    虽然此解决方案在某些情况下会起作用,但值得注意的是,当有多行文本时它不起作用 - 像这样.

    Though this solution will work in some cases, it's worth noting that it won't work when there are multiple lines of text - like this.

    .parent {
        height: 200px;
        width: 400px;
        background: lightgray;
        text-align: center;
    }
    
    .parent > .child {
        line-height: 200px;
    }

    <div class="parent">
        <span class="child">I'm vertically/horizontally centered!</span>
    </div>

    这篇关于如何使元素水平和垂直居中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持编程学习网!

本文标题为:如何使元素水平和垂直居中

基础教程推荐