为什么引导程序的容器类有填充，而行类有负边距来补偿填充 [英] why bootstrap's container class has padding while row class has negative margins to compensate the padding

查看：22
本文介绍了为什么引导程序的容器类有填充，而行类有负边距来补偿填充的处理方法，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

Bootstrap 的 container 类在两边都有填充:

.container-fixed(@gutter: @grid-gutter-width) {padding-left: (@gutter/2);填充右:(@gutter/2)；}

虽然 row 类有负 margins:

.make-row(@gutter: @grid-gutter-width) {左边距:(@gutter/-2)；右边距:(@gutter/-2)；}

所以当我们这样放置 html 时:

<div class="row">...

row 类中的内容占用容器从左到右的所有空间，使用负 margins 偏移 padding.我想知道为什么使用这种方法?我还看到它用于导航栏，特别是 navbar-right 类具有负边距.

解决方案

将列放在 .row 中会偏移填充，这样您就可以嵌套列.嵌套列对于控制某些(大多数)布局很重要.由于列内置了填充，如果您嵌套它们而不对其进行偏移，则填充会增加并且列内容不会像您想要的那样排列.看这个例子:

http://www.bootply.com/ZZ4ML0yjSG

<h3>没有 .row 缓冲区</h3><div class="col-md-12 bg-warning">第 1 列<div class="col-md-12 bg-danger"><div class="col-md-6 bg-info">没有 .row 缓冲区的嵌套列 1</div><div class="col-md-6 bg-success">没有 .row 缓冲区的嵌套第 2 列</div>

<小时><div class="容器"><h3>使用 .row 缓冲区</h3><div class="row"><div class="col-md-12 bg-warning">第 1 列<div class="row"><div class="col-md-12 bg-danger"><div class="row"><div class="col-md-6 bg-info">嵌套第 1 列与 .row 缓冲区</div><div class="col-md-6 bg-success">嵌套第 2 列与 .row 缓冲区</div>

Bootstrap's container class has paddings on both side:

.container-fixed(@gutter: @grid-gutter-width) {
  padding-left:  (@gutter / 2);
  padding-right: (@gutter / 2);
}

While row class has negative margins:

.make-row(@gutter: @grid-gutter-width) {
  margin-left:  (@gutter / -2);
  margin-right: (@gutter / -2);
}

So when we put html like that:

<div class="container">
  <div class="row">
    ...
  </div>
</div>

the content within the row class takes all the space from left to right side of the container offseting the padding using negaive margins. I'm wondering why this approach is used? I've also seen it being used for navbars, specifically navbar-right class has negative margin.

解决方案

Putting your columns in a .row offsets the padding, which is so you can nest columns. Nesting columns is important to have control of some (most) layouts. Since columns have built in padding, if you nest them without offsetting it that padding will multiply and column content won't line up like you want. See this example:

http://www.bootply.com/ZZ4ML0yjSG

<div class="container">
  <h3>Without .row buffer</h3>
  <div class="col-md-12 bg-warning">Column 1
    <div class="col-md-12 bg-danger">
      <div class="col-md-6 bg-info">Nested column 1 without .row buffer</div>
      <div class="col-md-6 bg-success">Nested column 2 without .row buffer</div>
    </div>
  </div>
</div>
<hr>
<div class="container">
  <h3>With .row buffer</h3>
  <div class="row">
    <div class="col-md-12 bg-warning">Column 1
      <div class="row">
      <div class="col-md-12 bg-danger">
        <div class="row">
          <div class="col-md-6 bg-info">Nested column 1 with .row buffer</div>
          <div class="col-md-6 bg-success">Nested column 2 with .row buffer</div>
        </div>
      </div>
  </div>
</div>

这篇关于为什么引导程序的容器类有填充，而行类有负边距来补偿填充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IT屋！

查看全文
相关文章
其他开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆