表单控件

为 <input> 和 <textarea> 等文本表单控件提供自定义样式、大小调整、焦点状态等升级。

示例

¥Example

表单控件采用 Sass 和 CSS 变量的混合样式，使它们能够适应颜色模式并支持任何自定义方法。

¥Form controls are styled with a mix of Sass and CSS variables, allowing them to adapt to color modes and support any customization method.

Email address

Example textarea

html

<div class="mb-3">
  <label for="exampleFormControlInput1" class="form-label">Email address</label>
  <input type="email" class="form-control" id="exampleFormControlInput1" placeholder="name@example.com">
</div>
<div class="mb-3">
  <label for="exampleFormControlTextarea1" class="form-label">Example textarea</label>
  <textarea class="form-control" id="exampleFormControlTextarea1" rows="3"></textarea>
</div>

尺寸

¥Sizing

使用 .form-control-lg 和 .form-control-sm 等类设置高度。

¥Set heights using classes like .form-control-lg and .form-control-sm.

html

<input class="form-control form-control-lg" type="text" placeholder=".form-control-lg" aria-label=".form-control-lg example">
<input class="form-control" type="text" placeholder="Default input" aria-label="default input example">
<input class="form-control form-control-sm" type="text" placeholder=".form-control-sm" aria-label=".form-control-sm example">

表单文本

¥Form text

可以使用 .form-text 创建块级或内联级表单文本。

¥Block-level or inline-level form text can be created using .form-text.

Form text should be explicitly associated with the form control it relates to using the aria-describedby attribute. This will ensure that assistive technologies—such as screen readers—will announce this form text when the user focuses or enters the control.

输入下方的表单文本可以使用 .form-text 设置样式。如果使用块级元素，则会添加顶部边距，以便于与上面的输入保持间距。

¥Form text below inputs can be styled with .form-text. If a block-level element will be used, a top margin is added for easy spacing from the inputs above.

Password

Your password must be 8-20 characters long, contain letters and numbers, and must not contain spaces, special characters, or emoji.

html

<label for="inputPassword5" class="form-label">Password</label>
<input type="password" id="inputPassword5" class="form-control" aria-describedby="passwordHelpBlock">
<div id="passwordHelpBlock" class="form-text">
  Your password must be 8-20 characters long, contain letters and numbers, and must not contain spaces, special characters, or emoji.
</div>

内联文本可以使用任何典型的内联 HTML 元素（无论是 <span>、<small> 还是其他元素），只需 .form-text 类即可。

¥Inline text can use any typical inline HTML element (be it a <span>, <small>, or something else) with nothing more than the .form-text class.

Password

Must be 8-20 characters long.

html

<div class="row g-3 align-items-center">
  <div class="col-auto">
    <label for="inputPassword6" class="col-form-label">Password</label>
  </div>
  <div class="col-auto">
    <input type="password" id="inputPassword6" class="form-control" aria-describedby="passwordHelpInline">
  </div>
  <div class="col-auto">
    <span id="passwordHelpInline" class="form-text">
      Must be 8-20 characters long.
    </span>
  </div>
</div>

禁用

¥Disabled

在输入上添加 disabled 布尔属性，使其渲染灰色外观、删除指针事件并防止聚焦。

¥Add the disabled boolean attribute on an input to give it a grayed out appearance, remove pointer events, and prevent focusing.

html

<input class="form-control" type="text" placeholder="Disabled input" aria-label="Disabled input example" disabled>
<input class="form-control" type="text" value="Disabled readonly input" aria-label="Disabled input example" disabled readonly>

只读

¥Readonly

在输入上添加 readonly 布尔属性以防止修改输入值。readonly 输入仍然可以被聚焦和选择，而 disabled 输入则不能。

¥Add the readonly boolean attribute on an input to prevent modification of the input’s value. readonly inputs can still be focused and selected, while disabled inputs cannot.

html

<input class="form-control" type="text" value="Readonly input here..." aria-label="readonly input example" readonly>

只读纯文本

¥Readonly plain text

如果你希望表单中的 <input readonly> 元素的样式设置为纯文本，请将 .form-control 替换为 .form-control-plaintext 以删除默认的表单字段样式并保留正确的 margin 和 padding。

¥If you want to have <input readonly> elements in your form styled as plain text, replace .form-control with .form-control-plaintext to remove the default form field styling and preserve the correct margin and padding.

Password

html

  <div class="mb-3 row">
    <label for="staticEmail" class="col-sm-2 col-form-label">Email</label>
    <div class="col-sm-10">
      <input type="text" readonly class="form-control-plaintext" id="staticEmail" value="email@example.com">
    </div>
  </div>
  <div class="mb-3 row">
    <label for="inputPassword" class="col-sm-2 col-form-label">Password</label>
    <div class="col-sm-10">
      <input type="password" class="form-control" id="inputPassword">
    </div>
  </div>

html

<form class="row g-3">
  <div class="col-auto">
    <label for="staticEmail2" class="visually-hidden">Email</label>
    <input type="text" readonly class="form-control-plaintext" id="staticEmail2" value="email@example.com">
  </div>
  <div class="col-auto">
    <label for="inputPassword2" class="visually-hidden">Password</label>
    <input type="password" class="form-control" id="inputPassword2" placeholder="Password">
  </div>
  <div class="col-auto">
    <button type="submit" class="btn btn-primary mb-3">Confirm identity</button>
  </div>
</form>

文件输入

¥File input

Default file input example

Multiple files input example

Disabled file input example

Small file input example

Large file input example

html

<div class="mb-3">
  <label for="formFile" class="form-label">Default file input example</label>
  <input class="form-control" type="file" id="formFile">
</div>
<div class="mb-3">
  <label for="formFileMultiple" class="form-label">Multiple files input example</label>
  <input class="form-control" type="file" id="formFileMultiple" multiple>
</div>
<div class="mb-3">
  <label for="formFileDisabled" class="form-label">Disabled file input example</label>
  <input class="form-control" type="file" id="formFileDisabled" disabled>
</div>
<div class="mb-3">
  <label for="formFileSm" class="form-label">Small file input example</label>
  <input class="form-control form-control-sm" id="formFileSm" type="file">
</div>
<div>
  <label for="formFileLg" class="form-label">Large file input example</label>
  <input class="form-control form-control-lg" id="formFileLg" type="file">
</div>

颜色

¥Color

设置 type="color" 并将 .form-control-color 添加到 <input>。我们使用修饰符类来设置固定的 height 并覆盖浏览器之间的一些不一致之处。

¥Set the type="color" and add .form-control-color to the <input>. We use the modifier class to set fixed heights and override some inconsistencies between browsers.

Color picker

html

<label for="exampleColorInput" class="form-label">Color picker</label>
<input type="color" class="form-control form-control-color" id="exampleColorInput" value="#563d7c" title="Choose your color">

数据列表

¥Datalists

数据列表允许你创建一组可以从 <input> 中访问（并自动补齐）的 <option>。这些与 <select> 元素类似，但具有更多菜单样式限制和差异。虽然大多数浏览器和操作系统都包含对 <datalist> 元素的一些支持，但它们的样式充其量是不一致的。

¥Datalists allow you to create a group of <option>s that can be accessed (and autocompleted) from within an <input>. These are similar to <select> elements, but come with more menu styling limitations and differences. While most browsers and operating systems include some support for <datalist> elements, their styling is inconsistent at best.

了解有关支持数据列表元素的更多信息。

¥Learn more about support for datalist elements.

Datalist example

html

<label for="exampleDataList" class="form-label">Datalist example</label>
<input class="form-control" list="datalistOptions" id="exampleDataList" placeholder="Type to search...">
<datalist id="datalistOptions">
  <option value="San Francisco">
  <option value="New York">
  <option value="Seattle">
  <option value="Los Angeles">
  <option value="Chicago">
</datalist>

CSS

Sass 变量

¥Sass variables

$input-* 在我们的大多数表单控件（而不是按钮）之间共享。

¥$input-* are shared across most of our form controls (and not buttons).

scss/_variables.scss

$input-padding-y:                       $input-btn-padding-y;
$input-padding-x:                       $input-btn-padding-x;
$input-font-family:                     $input-btn-font-family;
$input-font-size:                       $input-btn-font-size;
$input-font-weight:                     $font-weight-base;
$input-line-height:                     $input-btn-line-height;

$input-padding-y-sm:                    $input-btn-padding-y-sm;
$input-padding-x-sm:                    $input-btn-padding-x-sm;
$input-font-size-sm:                    $input-btn-font-size-sm;

$input-padding-y-lg:                    $input-btn-padding-y-lg;
$input-padding-x-lg:                    $input-btn-padding-x-lg;
$input-font-size-lg:                    $input-btn-font-size-lg;

$input-bg:                              var(--#{$prefix}body-bg);
$input-disabled-color:                  null;
$input-disabled-bg:                     var(--#{$prefix}secondary-bg);
$input-disabled-border-color:           null;

$input-color:                           var(--#{$prefix}body-color);
$input-border-color:                    var(--#{$prefix}border-color);
$input-border-width:                    $input-btn-border-width;
$input-box-shadow:                      var(--#{$prefix}box-shadow-inset);

$input-border-radius:                   var(--#{$prefix}border-radius);
$input-border-radius-sm:                var(--#{$prefix}border-radius-sm);
$input-border-radius-lg:                var(--#{$prefix}border-radius-lg);

$input-focus-bg:                        $input-bg;
$input-focus-border-color:              tint-color($component-active-bg, 50%);
$input-focus-color:                     $input-color;
$input-focus-width:                     $input-btn-focus-width;
$input-focus-box-shadow:                $input-btn-focus-box-shadow;

$input-placeholder-color:               var(--#{$prefix}secondary-color);
$input-plaintext-color:                 var(--#{$prefix}body-color);

$input-height-border:                   calc(#{$input-border-width} * 2); // stylelint-disable-line function-disallowed-list

$input-height-inner:                    add($input-line-height * 1em, $input-padding-y * 2);
$input-height-inner-half:               add($input-line-height * .5em, $input-padding-y);
$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y * .5);

$input-height:                          add($input-line-height * 1em, add($input-padding-y * 2, $input-height-border, false));
$input-height-sm:                       add($input-line-height * 1em, add($input-padding-y-sm * 2, $input-height-border, false));
$input-height-lg:                       add($input-line-height * 1em, add($input-padding-y-lg * 2, $input-height-border, false));

$input-transition:                      border-color .15s ease-in-out, box-shadow .15s ease-in-out;

$form-color-width:                      3rem;

$form-label-* 和 $form-text-* 用于我们的 <label> 和 .form-text 组件。

¥$form-label-* and $form-text-* are for our <label>s and .form-text component.

scss/_variables.scss

$form-label-margin-bottom:              .5rem;
$form-label-font-size:                  null;
$form-label-font-style:                 null;
$form-label-font-weight:                null;
$form-label-color:                      null;

scss/_variables.scss

$form-text-margin-top:                  .25rem;
$form-text-font-size:                   $small-font-size;
$form-text-font-style:                  null;
$form-text-font-weight:                 null;
$form-text-color:                       var(--#{$prefix}secondary-color);

$form-file-* 用于文件输入。

¥$form-file-* are for file input.

scss/_variables.scss

$form-file-button-color:          $input-color;
$form-file-button-bg:             var(--#{$prefix}tertiary-bg);
$form-file-button-hover-bg:       var(--#{$prefix}secondary-bg);