在Bootstrap 4行中居中复选框按钮

Question

我试图将复选框设置为Bootstrap中的按钮。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在许多地方使用的“文本中心”和“中心块”。）

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>

我创建了一个小提琴，并为其中一个div突出显示不同颜色的背景，以便您可以看到缺少居中： https://jsfiddle.net/rovh1fcw/3/

感谢您的帮助！我确信这是一件很简单的事我无法理解。

Answer 1

text-center类现在在Bootstrap 4 alpha中text-xs-center。同时从列中删除btn-group，因为这会导致按钮显示内联..

<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>

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

More on upgrading to Bootstrap 4

Answer 2

div[data-toggle]{  
   display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

https://jsfiddle.net/rovh1fcw/18/