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Form controls表单控件

Give textual form controls like <input>s and <textarea>s an upgrade with custom styles, sizing, focus states, and more.使用自定义样式、尺寸、聚焦状态等等，给文本表单控件，譬如<input>和<textarea>提供一个升级。

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Example例子

<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>

Sizing尺寸

Set heights using classes like .form-control-lg and .form-control-sm.使用.form-control-lg和.form-control-sm等类设置高度。

<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">

Disabled禁用

Add the disabled boolean attribute on an input to give it a grayed out appearance and remove pointer events.在输入上添加disabled的布尔属性，使其显示为灰色，并删除指针事件。

<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>

Readonly只读

Add the readonly boolean attribute on an input to prevent modification of the input’s value.在输入上添加readonly布尔属性，以防止修改输入的值。

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

Readonly plain text只读纯文本

If you want to have <input readonly> elements in your form styled as plain text, use the .form-control-plaintext class to remove the default form field styling and preserve the correct margin and padding.如果你想让表单中的<input readonly>被样式化为纯文本，请使用.form-control-plaintext类来删除默认的表单字段样式，并保留正确的边距和填充。

<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>
<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>

File input文本输入控件

<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>

Color颜色输入控件

<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">

Datalists输入建议列表

Datalists allow you to create a group of <option>s that can be accessed (and autocompleted) from within an <input>. 输入建议列表允许您创建一组可以从<input>中访问（并自动完成）的<option>。These are similar to <select> elements, but come with more menu styling limitations and differences. 这些与<select>元素，但有更多的菜单样式限制和差异。While most browsers and operating systems include some support for <datalist> elements, their styling is inconsistent at best.大多数浏览器和操作系统都支持<datalist>元素，它们的样式最多是不一致的。

Learn more about support for datalist elements.了解有关<datalist>元素支持的更多信息。

<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>

Sass

Variables变量

$input-* are shared across most of our form controls (and not buttons).在大多数表单控件（而不是按钮）中共享。

$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:                              $body-bg;
$input-disabled-bg:                     $gray-200;
$input-disabled-border-color:           null;
$input-color:                           $body-color;
$input-border-color:                    $gray-400;
$input-border-width:                    $input-btn-border-width;
$input-box-shadow:                      $box-shadow-inset;
$input-border-radius:                   $border-radius;
$input-border-radius-sm:                $border-radius-sm;
$input-border-radius-lg:                $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:               $gray-600;
$input-plaintext-color:                 $body-color;
$input-height-border:                   $input-border-width * 2;
$input-height-inner:                    add($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-* and $form-text-* are for our <label>s and .form-text component.$form-label-*和$form-text-*用于<label>组件和.form-text组件。

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

$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:                       $text-muted;

$form-file-* are for file input.用于文件输入控件。

$form-file-button-color:          $input-color;
$form-file-button-bg:             $input-group-addon-bg;
$form-file-button-hover-bg:       shade-color($form-file-button-bg, 5%);