How to get button groups that span the full width of a parent in Bootstrap?

问题

In Bootstrap, how can I get a button group like the following that span the full width of a parent element? (like with the ".btn-block" class, but applied to a group http://getbootstrap.com/css/#buttons-sizes )

<div class="btn-group" role="group" aria-label="...">
  <button type="button" class="btn btn-default">Left</button>
  <button type="button" class="btn btn-default">Middle</button>
  <button type="button" class="btn btn-default">Right</button>
</div>

回答1:

Flexbox can do that.

.btn-group.special {
  display: flex;
}

.special .btn {
  flex: 1
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<div class="btn-group special" role="group" aria-label="...">
  <button type="button" class="btn btn-default">Left</button>
  <button type="button" class="btn btn-default">Middle</button>
  <button type="button" class="btn btn-default">Right</button>
</div>

回答2:

Correct solution for Bootstrap 4 (from its migration documentation):

Removed .btn-group-justified. As a replacement you can use <div class="btn-group d-flex" role="group"></div> as a wrapper around elements with .w-100.

Example:

<div class="btn-group d-flex" role="group" aria-label="...">
  <button type="button" class="btn btn-default w-100">Left</button>
  <button type="button" class="btn btn-default w-100">Middle</button>
  <button type="button" class="btn btn-default w-100">Right</button>
</div>

Source: https://getbootstrap.com/docs/4.0/migration/#button-group

回答3:

In Bootstrap 4, make use of .d-flex on your .btn-group and .w-100 on individual buttons:

.btn-group.d-flex(role='group')
  button.w-100.btn.btn-lg.btn-success(type='button') 👍
  button.w-100.btn.btn-lg.btn-danger(type='button') 👎
  .btn-group(role='group')
    button#btnGroupDrop1.btn.btn-lg.btn-light.dropdown-toggle(type='button', data-toggle='dropdown')
      | &#8226;&#8226;&#8226;
    .dropdown-menu
      a.dropdown-item(href='#') An option
      a.dropdown-item(href='#') Another option

回答4:

You can also use .btn-group-justified.

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />

<div class="container">
  <div class="btn-group btn-group-justified">
    <a href="button" class="btn btn-default">Left</a>
    <a href="button" class="btn btn-default">Middle</a>
    <a href="button" class="btn btn-default">Right</a>
  </div>
</div>

回答5:

You can also use bootstraps btn-block will span across parent.

Create block level buttons—those that span the full width of a parent—by adding .btn-block.

<button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button>
<button type="button" class="btn btn-secondary btn-lg btn-block">Block level button</button>

https://getbootstrap.com/docs/4.0/components/buttons/

来源：https://stackoverflow.com/questions/37190248/how-to-get-button-groups-that-span-the-full-width-of-a-parent-in-bootstrap

标签

html

css

twitter-bootstrap

class

buttongroup