如何使用HTML和CSS在一行上均匀地分割按钮？

Question

在我的HTML代码中，我试图在模态中创建几个按钮。我正在使用Bootstrap。在页脚部分，我试图在模态（或模态页脚）的宽度之间均匀地分割这些按钮。

我可以使用Bootstrap列来实现这一点，但填充（在包含.col-*类的元素之间）可能对于此目的来说有点太大了。我可以指定宽度，但这不会在可用空间量之间平均分割元素。

这是我到目前为止所尝试的：

$(document).ready(function() {
  $(".modal").modal();
});

.foo {
  /* Hardcoded width, how could I make it that when adding buttons, width is split among amount of buttons? */
  float: left;
  width: 30%;
  margin: 0 5px;
}

.bar {
  /* Not working to center the buttons: */
  margin: 0 auto;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<div class="modal fade bs-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
  <div class="modal-dialog modal-lg" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title">Modal title</h4>
      </div>
      <div class="modal-body">
        <p>&hellip;</p>
      </div>
      <div class="modal-footer">
        <!-- Content with three evenly spread/divided buttons on a single line -->
        <div class="bar">
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 1</button>
          </div>
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 2</button>
          </div>
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 3</button>
          </div>
        </div>
        <!-- End of content -->
      </div>
    </div>
  </div>
</div>

JSFiddle

将宽度设置为30％显然并不总是使按钮均匀分开（例如，如果我添加另一个按钮，则按钮不再均匀分布）。另请注意，按钮略微向左倾斜。我希望按钮随着模态（a.k.a.响应性）的大小而增长。在Modal的页脚中将按钮拆分/分散在一条线上的最佳方法是什么？

Answer 1

在条形div上添加display: flex并在子div上添加flex: 1 0 auto;

那时你不需要30％的宽度。

.bar {
  display: flex;
}

.bar > div {
  flex: 1 0 auto;
}

$(document).ready(function() {
  $(".modal").modal();
});

.foo {
  margin: 0 5px;
}

.bar {
  display: flex;
}

.bar>div {
  flex: 1 0 auto;
}

<link href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<div class="modal fade bs-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
  <div class="modal-dialog modal-lg" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title">Modal title</h4>
      </div>
      <div class="modal-body">
        <p>&hellip;</p>
      </div>
      <div class="modal-footer">
        <!-- Content with three evenly spread/divided buttons on a single line -->
        <div class="bar">
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 1</button>
          </div>
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 2</button>
          </div>
          <div class="foo">
            <button type="button" class="btn btn-default btn-block">Button 3</button>
          </div>
        </div>
        <!-- End of content -->
      </div>
    </div>
  </div>
</div>

更新了jsfiddle

Answer 2

您可以使用此引导程序：

    <div class="btn-toolbar" role="toolbar" aria-label="Toolbar with button groups">
      <div class="btn-group mr-2" role="group" aria-label="First group">
        <button type="button" class="btn btn-secondary">Button 1</button>

      </div>
      <div class="btn-group mr-2" role="group" aria-label="Second group">
        <button type="button" class="btn btn-secondary">Button 2</button>

      </div>
      <div class="btn-group" role="group" aria-label="Third group">
        <button type="button" class="btn btn-secondary">Button 3</button>
      </div>
    </div>

我想添加另一个按钮，你可以做到。

    <div class="btn-toolbar" role="toolbar" aria-label="Toolbar with button groups">
      <div class="btn-group mr-2" role="group" aria-label="First group">
        <button type="button" class="btn btn-secondary">Button 1</button>

      </div>
      <div class="btn-group mr-2" role="group" aria-label="Second group">
        <button type="button" class="btn btn-secondary">Button 2</button>

      </div>
      <div class="btn-group" role="group" aria-label="Third group">
        <button type="button" class="btn btn-secondary">Button 3</button>
      </div>
      <div class="btn-group" role="group" aria-label="Fourth group">
        <button type="button" class="btn btn-secondary">Button 4</button>
      </div>
    </div>