如何在Bootstrap 3中垂直对齐标签和输入？

Question

如何在Bootstrap 3中垂直对齐标签和输入？我希望标签和输入都在同一行.我玩过不同的类和自定义CSS但似乎没什么用.

JSfiddle

<div class="form-group">
    <div class="row">
        <div class="col-xs-3">
            <label for="class_type"><h2><span class=" label label-primary">Class Type</span></h2></label>
        </div>
        <div class="col-xs-2">
            <select name="class_type" id="class_type" class="  form-control input-lg" style="width:200px" autocomplete="off">
                <option >Economy</option>
                <option >Premium Economy</option>
                <option >Club World</option>
                <option >First Class</option>
            </select>
        </div>
     </div>
</div>

Answer 1

水平表单的bootstrap 3 docs 允许您使用.form-horizontal该类使表单标签和输入垂直对齐.这些表格的结构是:

<form class="form-horizontal" role="form">
  <div class="form-group">
    <label for="input1" class="col-lg-2 control-label">Label1</label>
    <div class="col-lg-10">
      <input type="text" class="form-control" id="input1" placeholder="Input1">
    </div>
  </div>
  <div class="form-group">
    <label for="input2" class="col-lg-2 control-label">Label2</label>
    <div class="col-lg-10">
      <input type="password" class="form-control" id="input2" placeholder="Input2">
    </div>
  </div>
</form>

因此,您的表单应如下所示:

<form class="form-horizontal" role="form">
    <div class="form-group">
        <div class="col-xs-3">
            <label for="class_type"><h2><span class=" label label-primary">Class Type</span></h2></label>
        </div>
        <div class="col-xs-2">
            <select id="class_type" class="form-control input-lg" autocomplete="off">
                <option>Economy</option>
                <option>Premium Economy</option>
                <option>Club World</option>
                <option>First Class</option>
            </select>
        </div>
    </div>
</form>

Answer 2

我相信你现在已经找到了答案,但对于那些仍在寻找答案的人:

当使用input-lg时,边距不匹配,除非你使用form-group-lg和form-group类.它的例子是在docs中:

<form class="form-horizontal">
  <div class="form-group form-group-lg">
    <label class="col-sm-2 control-label" for="formGroupInputLarge">Large label</label>
    <div class="col-sm-10">
      <input class="form-control" type="text" id="formGroupInputLarge" placeholder="Large input">
    </div>
  </div>
  <div class="form-group form-group-sm">
    <label class="col-sm-2 control-label" for="formGroupInputSmall">Small label</label>
    <div class="col-sm-10">
      <input class="form-control" type="text" id="formGroupInputSmall" placeholder="Small input">
    </div>
  </div>
</form>

Answer 3

问题是您<label>在<h2>标记内,标题标记margin由默认样式表设置.

Answer 4

这些解决方案都不适合我。但是<div class="form-row align-items-center">，根据Bootstrap示例，我可以通过对每个表单行使用来获得垂直居中。