Bootstrap5 表单浮动标签

2023-07-12 16:10 更新

默认情况下，标签内容一般显示在 input 输入框的上方：

使用浮动标签，可以在 input 输入框内插入标签，在单击 input 输入框时使它们浮动到上方

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>表单浮动标签 - input</h2>
  <p>点击输入框查看浮动效果:</p>
  <form action="/action_page.php">
    <div class="form-floating mb-3 mt-3">
      <input type="text" class="form-control" id="email" placeholder="Enter email" name="email">
      <label for="email">Email</label>
    </div>
    <div class="form-floating mt-3 mb-3">
      <input type="text" class="form-control" id="pwd" placeholder="Enter password" name="pswd">
      <label for="pwd">Password</label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
  </form>
</div>

</body>
</html>

注意事项： <label> 元素必须在 <input> 元素之后，并且每个 <input> 元素都需要 placeholder 属性。

文本框

文本框 textarea 也可以有浮动效果：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>表单浮动标签 - textarea</h2>
  <p>点击文本框查看浮动效果:</p>
  <form action="/action_page.php">
    <div class="form-floating mb-3 mt-3">
      <textarea class="form-control" id="comment" name="text" placeholder="Comment goes here"></textarea>
      <label for="comment">Comments</label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
  </form>
</div>

</body>
</html>

选择框

我们可以在选择菜单上使用浮动标签，它将始终显示在选择菜单的左上角，不会有点击浮动效果：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>表单浮动标签 - select</h2>
  <p>我们可以在选择菜单上使用浮动标签，它将始终显示在选择菜单的左上角，不会有点击浮动效果：</p>
  <form action="/action_page.php">
    <div class="form-floating mb-3 mt-3">
      <select class="form-select" id="sel1" name="sellist">
        <option>1</option>
        <option>2</option>
        <option>3</option>
        <option>4</option>
      </select>
      <label for="sel1" class="form-label">Select list (select one):</label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
  </form>
</div>

</body>
</html>

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