左&在Bootstrap 4中右对齐模式页脚按钮 [英] Left & right align modal footer buttons in Bootstrap 4

问题描述

Bootstrap 4将flex-box用于其模态页脚.如果我想要两个按钮，一个在左边，一个在右边，如何使它正常工作?

Bootstrap 4 uses flex-box for it's modal footers. If I want two buttons, one on the left and one on the right, how do I get it to work properly?

下面的代码尝试将div.row与col-sm-6一起使用，但不起作用.

The code below tries to use a div.row with col-sm-6 but doesn't work.

<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
      <div class="row">
        <div class="col-sm-6 text-left">
        <button type="button" class="btn btn-primary">Save changes</button>
        </div>
        <div class="col-sm-6 text-right">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        </div>
      </div>
      </div>
    </div>
  </div>
</div>

推荐答案

现在在Bootstrap 4中，modal-footer是"display:flex"，使用自动边距最简单.使用左侧按钮上的mr-auto.

Now that the modal-footer is "display:flex" in Bootstrap 4, it would be easiest to use the auto-margins. Use mr-auto on the left button.

<div class="modal-footer">
     <button type="button" class="btn btn-primary mr-auto">Save changes</button>
     <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>

演示

另请参阅:在其中左对齐和右对齐引导程序中的div

跟进评论如果我需要右边的按钮来占据剩余的所有空间怎么办?" -使用btn-block类:

Follow-up to comment "What if I need the button on the right to occupy all the space left?" - Use the btn-block class:

<div class="modal-footer">
     <button type="button" class="btn btn-primary text-nowrap">Save changes</button>
     <button type="button" class="btn btn-secondary btn-block ml-1" data-dismiss="modal">Close</button>
</div>

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