如何在输入组下添加小文本？

Question

如何在输入组下添加小文本？

SNa*_*aRe 1 html css twitter-bootstrap bootstrap-4

我正在尝试在输入组下添加一个小文本。但它不起作用，因为它与 form-group 一起使用。

所以在这个例子中，我希望帮助文本位于输入下方，而不是位于输入右侧这就是我对输入组的意思https://getbootstrap.com/docs/4.0/components/input-group/

这是 jsfiddle 的播放链接https://jsfiddle.net/c59hnx8v/

顺便说一句，这只是为了演示。

<!DOCTYPE html>
<html lang="en">

<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"></script>
</head>

<body>

  <div class="container mt-3">
    <form>
      <div class="row">
        <div class="col">
          <label for="demo">Write your email here:</label>
          <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <div class="input-group-append">
              <span class="input-group-text">@</span>
            </div>
            <small>Help text</small>
          </div>
        </div>
        <div class="col">
          <label for="demo">Write your email here:</label>
          <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <div class="input-group-append">
              <span class="input-group-text">@</span>
            </div>
            <small>Help text</small>
          </div>
        </div>
        <div class="col">
          <label for="demo">Write your email here:</label>
          <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <div class="input-group-append">
              <span class="input-group-text">@</span>
            </div>
            <small>Help text</small>
          </div>
        </div>
        <div class="col">
          <label for="demo">Write your email here:</label>
          <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <div class="input-group-append">
              <span class="input-group-text">@</span>
            </div>
            <small>Help text</small>
          </div>
        </div>
        <div class="col">
          <label for="demo">Write your email here:</label>
          <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
            <div class="input-group-append">
              <span class="input-group-text">@</span>
            </div>
            <small>Help text</small>
          </div>
        </div>
      </div>
    </form>
  </div>

</body>

</html>

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Answer 1

Zim*_*Zim 6

这与此处的问题类似，并且问题存在是因为 Bootstrap 4 输入组是display:flex。

最简单的“修复”是确保help-text宽度：100%，并且w-100可以使用该类来实现此目的。这不需要额外的 CSS。

  <div class="col">
      <label for="demo">Write your email here:</label>
      <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Email" id="demo" name="email">
        <div class="input-group-append">
          <span class="input-group-text">@</span>
        </div>
        <small class="w-100">Help text</small>
      </div>
  </div>

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https://www.codeply.com/go/MvXabRrm2c

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