Bootstrap: 表单组中的垂直居中标签

Question

我在水平表单中有一个表单组。在这个表单组中，右边的元素高于左边的元素。出于这个原因，我想将左侧元素在其行中垂直居中。例如：

<form class="form-horizontal">
    <div class="form-group">
      <label for="inputEmail3" class="col-sm-2 control-label">Email1</label>
      <div class="col-sm-10"> <!-- higher element -->
        <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
        <br>Random stuff
      </div>
    </div>
    <div class="form-group">
      <label for="inputEmail3" class="col-sm-2 control-label">Email2</label>
      <div class="col-sm-10"> 
        <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
      </div>
    </div>
</form>

Email1 当前显示在其自身行的顶部，如 this plunker snippet.

中所示

编辑：为了阐明我的意图，这是当前状态：

这就是我想要的（蓝色区域就是前面提到的"row"）：

Answer 1

如果您只是想让 label1 像您的图像一样下拉，您不能只添加一个 class 给它一些 padding-top 吗？喜欢这个 jsfiddle

不清楚您是要全部下拉还是仅 label1。

CSS

.label1{padding-top:35px !important}

HTML

<form class="form-horizontal">
<div class="form-group">
  <label for="inputEmail3" class="label1 col-sm-2 control-label">Email1</label>
  <div class="col-sm-10"> <!-- higher element -->
    <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
    <br>Random stuff
  </div>
</div>
<div class="form-group">
  <label for="inputEmail3" class="col-sm-2 control-label">Email2</label>
  <div class="col-sm-10"> 
    <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
  </div>
 </div>
</form>

Answer 2

你可以这样做：

.form-horizontal .form-group {
    transform-style: preserve-3d;
}
.form-horizontal .vertically-aligned-label {
    position: relative;
    top: 50%;
    transform: translateY(50%);
}

Answer 3

您可以将行高设置为等于使用 CSS 的高度。另外，不要重复域 ID，您只能使用 id="inputEmail3" 一次。我更改了两个 ID 以适合文本。

CSS

label[for="inputEmail3"]{
    height: 74px;
    line-height: 74px;
}

HTML

<form class="form-horizontal">
    <div class="form-group">
      <label for="inputEmail3" class="col-sm-2 control-label">Email1</label>
      <div class="col-sm-10"> <!-- higher element -->
        <input type="email" class="form-control" id="inputEmail1" placeholder="Email">
        <br>Random stuff
      </div>
    </div>
    <div class="form-group">
      <label for="inputEmail3" class="col-sm-2 control-label">Email2</label>
      <div class="col-sm-10"> 
        <input type="email" class="form-control" id="inputEmail2" placeholder="Email">
      </div>
    </div>
</form>

Answer 4

如果您准备放弃对某些 "old" 浏览器的支持，您可以使用 flexbox 功能（参见 caniuse.com flex）

<div class="form-group flex-group">
  <label for="inputEmail3" class="col-sm-2 control-label">Email1</label>
  <div class="col-sm-10">
    <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
    <br>Random stuff
  </div>
</div>

@media (min-width: 768px) {
  .flex-group {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
            align-items: center;
  }
  .form-horizontal .flex-group .control-label {
    padding-top: 0;
  }
}

http://plnkr.co/edit/BQ6C4LGiL4oe1ZQTQ3Ys

Answer 5

如果在小型设备上查看，您还需要控制它，因为标签将位于输入的顶部。

我添加了更多内容 bootstrap 来为您介绍这一点。

见此Fiddle.

<div class="container block ">

<div class="col-md-6 col-md-offset-3 col-sm-7 col-sm-offset-2 col-xs-11 col-xs-offset-0">    
<form class="form-horizontal">
    <div class="row block bg-info form-group">
    <label for="inputEmail3" class="label1 col-sm-2 col-xs-2 control-label">Email1</label>
        <div class="col-md-8 col-sm-9 col-xs-9 col-xs-push-1"> <!-- higher element -->
        <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
        <br>Random stuff
        <br>Random stuff 
        <br>Random stuff  
        </div>
    </div>
    <div class="row block bg-info form-group">
    <label for="inputEmail3" class="label2 col-sm-2 col-xs-2 control-label">Email2</label>
        <div class="col-md-8 col-sm-9 col-xs-9 col-xs-push-1"> 
        <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
        </div>
        </div>
</form> 
</div>
</div>

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