使用 Bootstrap v4 对齐按钮 | shown

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使用 Bootstrap v4 对齐按钮

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本文介绍了使用 Bootstrap v4 对齐按钮的处理方法，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 v4 删除了 .btn-group-justified 类，参见

处理边界

由于用于对齐按钮的特定 HTML 和 CSS(即 display: table-cell)，它们之间的边框加倍.在常规按钮组中，margin-left: -1px 用于堆叠边框而不是删除它们.但是，margin 不适用于 display: table-cell.因此，根据您对 Bootstrap 的自定义设置，您可能希望删除或重新着色边框.

用作按钮的链接

如果 <a> 元素用作按钮——触发页面内功能，而不是导航到当前页面内的另一个文档或部分——它们也应该被赋予适当的role="button".

下拉菜单

为下拉按钮使用以下 HTML 代码:

 
<a class="btn btn-secondary" href="#" role="button">左</a><a class="btn btn-secondary" href="#" role="button">Middle</a><div class="btn-group"><button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">行动<div class="下拉菜单"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><a class="dropdown-item" href="#">这里还有别的东西</a><div class="dropdown-divider"></div><a class="dropdown-item" href="#">分隔链接</a>

带有下拉按钮的对齐按钮组应如下图所示:

带有元素

要使用带有元素的对齐按钮组，您必须将每个按钮包装在一个按钮组中.大多数浏览器都没有正确地将我们的 CSS 应用到元素上，但由于我们支持按钮下拉菜单，我们可以解决这个问题.

HTML

 
<div class="btn-group" role="group"><button type="button" class="btn btn-secondary">左</button>
<div class="btn-group" role="group"><button type="button" class="btn btn-secondary">Middle</button>

<div class="btn-group" role="group"><button type="button" class="btn btn-secondary">右</button>

上面用于用 <button> 元素对齐按钮组的 HTML 代码应该如下图所示:

Bootstrap v4 drops the .btn-group-justified class, see https://github.com/twbs/bootstrap/issues/17631

How to justify the button for:

 <div class="btn-group btn-group-justified" role="group" aria-label="Justified button group">
   <a class="btn btn-primary" href="#" role="button">Left</a>
   <a class="btn btn-primary" href="#" role="button">Middle</a>
   <a class="btn btn-primary" href="#" role="button">Right</a>
 </div>

解决方案

Indeed the nav-justify class is missing. You can add it yourself based on TB3's code for now:

SCSS code

// Justified button groups
// ----------------------

.btn-group-justified {
  display: table;
  width: 100%;
  table-layout: fixed;
  border-collapse: separate;
  .btn,
  .btn-group {
    float: none;
    display: table-cell;
    width: 1%;
    .btn {
      width: 100%;
    }
    .dropdown-menu {
      left: auto;
    }
  }
}

compiled CSS code

.btn-group-justified {
  display: table;
  width: 100%;
  table-layout: fixed;
  border-collapse: separate; }
  .btn-group-justified .btn,
  .btn-group-justified .btn-group {
    float: none;
    display: table-cell;
    width: 1%; }
    .btn-group-justified .btn .btn,
    .btn-group-justified .btn-group .btn {
      width: 100%; }
    .btn-group-justified .btn .dropdown-menu,
    .btn-group-justified .btn-group .dropdown-menu {
      left: auto; }

HTML

 <div class="btn-group btn-group-justified" role="group" aria-label="Justified button group">
   <a class="btn btn-primary" href="#" role="button">Left</a>
   <a class="btn btn-primary" href="#" role="button">Middle</a>
   <a class="btn btn-primary" href="#" role="button">Right</a>
 </div>

The above HTML code now will look like that shown in the figure beneath:

Handling borders

Due to the specific HTML and CSS used to justify buttons (namely display: table-cell), the borders between them are doubled. In regular button groups, margin-left: -1px is used to stack the borders instead of removing them. However, margin doesn't work with display: table-cell. As a result, depending on your customizations to Bootstrap, you may wish to remove or re-color the borders.

Links acting as buttons

If the <a> elements are used to act as buttons – triggering in-page functionality, rather than navigating to another document or section within the current page – they should also be given an appropriate role="button".

Dropdowns

Use the following HTML code for dropdown buttons:

 <div class="btn-group btn-group-justified" role="group" aria-label="Justified button group with nested dropdown">
   <a class="btn btn-secondary" href="#" role="button">Left</a>
   <a class="btn btn-secondary" href="#" role="button">Middle</a>
    <div class="btn-group">
      <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        Action
      </button>
      <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Action</a>
        <a class="dropdown-item" href="#">Another action</a>
        <a class="dropdown-item" href="#">Something else here</a>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
      </div>
    </div>
 </div>

The justified button group with dropdown button should look like that shown in the figure below:

With `<button>` elements

To use justified button groups with <button> elements, you must wrap each button in a button group. Most browsers don't properly apply our CSS for justification to <button> elements, but since we support button dropdowns, we can work around that.

HTML

 <div class="btn-group btn-group-justified" role="group" aria-label="Justified button group">
   <div class="btn-group" role="group">
     <button type="button" class="btn btn-secondary">Left</button>
   </div>
   <div class="btn-group" role="group">
     <button type="button" class="btn btn-secondary">Middle</button>
   </div>
   <div class="btn-group" role="group">
     <button type="button" class="btn btn-secondary">Right</button>
  </div>
 </div>

The above HTML code used to justified button groups with <button> elements should look like that shown in the figure beneath:

这篇关于使用 Bootstrap v4 对齐按钮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！

08-04 03:48