html - Bootstrap 4 行中的居中复选框按钮

Question

我正在尝试将复选框作为 Bootstrap 中的按钮居中。我尝试在周围的 div 和输入中使用“text-center”和“center-block”，但没有效果。 (您可以在示例中看到“text-center”和“center-block”在许多地方使用。)

HTML:

    <div class="row grade-selection">
      <div class="col-xs-1"></div>
      <div class="col-xs-2 btn-group text-center" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">K</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary text-center">
          <input type="checkbox" autocomplete="off">1</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input class="text-center" type="checkbox" autocomplete="off">2</label>
      </div>
      <div class="col-xs-2 btn-group center-block" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">3</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary center-block">
          <input type="checkbox" autocomplete="off">4</label>
      </div>
      <div class="col-xs-1"></div>
    </div>
    <div class="row grade-selection">
      <div class="col-xs-1"></div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input class="center-block" type="checkbox" autocomplete="off">5</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary active">
          <input type="checkbox" checked autocomplete="off">6</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary active">
          <input type="checkbox" checked autocomplete="off">7</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">8</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">9</label>
      </div>
      <div class="col-xs-1"></div>
    </div>
    <div class="row grade-selection">
      <div class="col-xs-3"></div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">10</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">11</label>
      </div>
      <div class="col-xs-2 btn-group" data-toggle="buttons">
        <label class="btn btn-primary">
          <input type="checkbox" autocomplete="off">12</label>
      </div>
      <div class="col-xs-3"></div>
    </div>

  </div>
</div>

我创建了一个 fiddle ，并为其中一个 div 突出显示了不同颜色的背景，以便您可以看到缺乏居中的情况: https://jsfiddle.net/rovh1fcw/3/

感谢您的帮助!我确信我忽略了一些简单的事情。

Answer 1

Bootstrap 4 alpha 中的 text-center 类现在为 text-xs-center。还要从列中删除 btn-group，因为这会导致按钮显示为内联..

<div class="col-xs-2 text-xs-center" data-toggle="buttons">
  <label class="btn btn-primary text-xs-center">
  <input type="checkbox" autocomplete="off">1</label>
</div>

演示: http://www.codeply.com/go/ZjGIIW1qeQ

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