Example

Wrap a pair of <input class="form-control"> and <label> elements in .form-floating to enable floating labels with Bootstrap’s textual form fields. A placeholder is required on each <input> as our method of CSS-only floating labels uses the :placeholder-shown pseudo-element. Also note that the <input> must come first so we can utilize a sibling selector (e.g., ~).

Floating labels - 图1

  1. <div class="form-floating mb-3">
  2. <input type="email" class="form-control" id="floatingInput" placeholder="name@example.com">
  3. <label for="floatingInput">Email address</label>
  4. </div>
  5. <div class="form-floating">
  6. <input type="password" class="form-control" id="floatingPassword" placeholder="Password">
  7. <label for="floatingPassword">Password</label>
  8. </div>

When there’s a value already defined, <label>s will automatically adjust to their floated position.

Floating labels - 图2

  1. <form class="form-floating">
  2. <input type="email" class="form-control" id="floatingInputValue" placeholder="name@example.com" value="test@example.com">
  3. <label for="floatingInputValue">Input with value</label>
  4. </form>

Form validation styles also work as expected.

Floating labels - 图3

  1. <form class="form-floating">
  2. <input type="email" class="form-control is-invalid" id="floatingInputInvalid" placeholder="name@example.com" value="test@example.com">
  3. <label for="floatingInputInvalid">Invalid input</label>
  4. </form>

Textareas

By default, <textarea>s with .form-control will be the same height as <input>s.

Floating labels - 图4

  1. <div class="form-floating">
  2. <textarea class="form-control" placeholder="Leave a comment here" id="floatingTextarea"></textarea>
  3. <label for="floatingTextarea">Comments</label>
  4. </div>

To set a custom height on your <textarea>, do not use the rows attribute. Instead, set an explicit height (either inline or via custom CSS).

Floating labels - 图5

  1. <div class="form-floating">
  2. <textarea class="form-control" placeholder="Leave a comment here" id="floatingTextarea2" style="height: 100px"></textarea>
  3. <label for="floatingTextarea2">Comments</label>
  4. </div>

Selects

Other than .form-control, floating labels are only available on .form-selects. They work in the same way, but unlike <input>s, they’ll always show the <label> in its floated state. Selects with size and multiple are not supported.

Floating labels - 图6

  1. <div class="form-floating">
  2. <select class="form-select" id="floatingSelect" aria-label="Floating label select example">
  3. <option selected>Open this select menu</option>
  4. <option value="1">One</option>
  5. <option value="2">Two</option>
  6. <option value="3">Three</option>
  7. </select>
  8. <label for="floatingSelect">Works with selects</label>
  9. </div>

Layout

When working with the Bootstrap grid system, be sure to place form elements within column classes.

Floating labels - 图7

  1. <div class="row g-2">
  2. <div class="col-md">
  3. <div class="form-floating">
  4. <input type="email" class="form-control" id="floatingInputGrid" placeholder="name@example.com" value="mdo@example.com">
  5. <label for="floatingInputGrid">Email address</label>
  6. </div>
  7. </div>
  8. <div class="col-md">
  9. <div class="form-floating">
  10. <select class="form-select" id="floatingSelectGrid" aria-label="Floating label select example">
  11. <option selected>Open this select menu</option>
  12. <option value="1">One</option>
  13. <option value="2">Two</option>
  14. <option value="3">Three</option>
  15. </select>
  16. <label for="floatingSelectGrid">Works with selects</label>
  17. </div>
  18. </div>
  19. </div>

Sass

Variables

  1. $form-floating-height: add(3.5rem, $input-height-border);
  2. $form-floating-padding-x: $input-padding-x;
  3. $form-floating-padding-y: 1rem;
  4. $form-floating-input-padding-t: 1.625rem;
  5. $form-floating-input-padding-b: .625rem;
  6. $form-floating-label-opacity: .65;
  7. $form-floating-label-transform: scale(.85) translateY(-.5rem) translateX(.15rem);
  8. $form-floating-transition: opacity .1s ease-in-out, transform .1s ease-in-out;