使用我们完全重写的检查组件创建一致的跨浏览器和跨设备复选框和单选。
方法
浏览器默认复选框和单选框在 的帮助下被替换，这两种输入类型的一系列类改进了其 HTML 元素的布局和行为，从而提供了更大的自定义和跨浏览器一致性。复选框用于选择列表中的一个或多个选项，而单选框用于从多个选项中选择一个选项。.form-check
从结构上讲，我们的 s 和 s 是兄弟元素，而不是 .这稍微详细一些，因为您必须指定 和 属性来关联 和 。我们对所有状态使用兄弟选择器 （），例如 或 。当与类结合使用时，我们可以根据 的状态轻松地为每个项目设置文本样式。<input><label><input><label>idfor<input><label>~<input>:checked:disabled.form-check-label<input>
我们的检查使用自定义 Bootstrap 图标来指示已检查或不确定的状态。
检查
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkDefault">
<label class="form-check-label" for="checkDefault">
Default checkbox
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkChecked" checked>
<label class="form-check-label" for="checkChecked">
Checked checkbox
</label>
</div>定
通过 JavaScript 手动设置时，复选框可以使用伪类（没有可用的 HTML 属性来指定它）。:indeterminate
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkIndeterminate">
<label class="form-check-label" for="checkIndeterminate">
Indeterminate checkbox
</label>
</div>禁用
添加属性，关联的 s 会自动设置样式以与较浅的颜色匹配，以帮助指示输入的状态。disabled<label>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkIndeterminateDisabled" disabled>
<label class="form-check-label" for="checkIndeterminateDisabled">
Disabled indeterminate checkbox
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkDisabled" disabled>
<label class="form-check-label" for="checkDisabled">
Disabled checkbox
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="checkCheckedDisabled" checked disabled>
<label class="form-check-label" for="checkCheckedDisabled">
Disabled checked checkbox
</label>
</div>radios
<div class="form-check">
<input class="form-check-input" type="radio" name="radioDefault" id="radioDefault1">
<label class="form-check-label" for="radioDefault1">
Default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="radioDefault" id="radioDefault2" checked>
<label class="form-check-label" for="radioDefault2">
Default checked radio
</label>
</div>禁用
添加属性，关联的 s 会自动设置样式以与较浅的颜色匹配，以帮助指示输入的状态。disabled<label>
<div class="form-check">
<input class="form-check-input" type="radio" name="radioDisabled" id="radioDisabled" disabled>
<label class="form-check-label" for="radioDisabled">
Disabled radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="radioDisabled" id="radioCheckedDisabled" checked disabled>
<label class="form-check-label" for="radioCheckedDisabled">
Disabled checked radio
</label>
</div>开关
开关具有自定义复选框的标记，但使用该类来呈现切换开关。请考虑使用 将控制的性质更准确地传达给支持此角色的辅助技术。在较旧的辅助技术中，它将简单地作为常规复选框宣布作为后备。交换机也支持该属性。.form-switchrole="switch"disabled
<div class="form-check form-switch">
<input class="form-check-input" type="checkbox" role="switch" id="switchCheckDefault">
<label class="form-check-label" for="switchCheckDefault">Default switch checkbox input</label>
</div>
<div class="form-check form-switch">
<input class="form-check-input" type="checkbox" role="switch" id="switchCheckChecked" checked>
<label class="form-check-label" for="switchCheckChecked">Checked switch checkbox input</label>
</div>
<div class="form-check form-switch">
<input class="form-check-input" type="checkbox" role="switch" id="switchCheckDisabled" disabled>
<label class="form-check-label" for="switchCheckDisabled">Disabled switch checkbox input</label>
</div>
<div class="form-check form-switch">
<input class="form-check-input" type="checkbox" role="switch" id="switchCheckCheckedDisabled" checked disabled>
<label class="form-check-label" for="switchCheckCheckedDisabled">Disabled checked switch checkbox input</label>
</div>本机交换机
通过在输入中添加属性以在切换开关时启用触觉反馈，逐步增强移动 Safari （iOS 17.4+） 的开关，就像本机 iOS 开关一样。在 Bootstrap 中使用此属性不会附加任何样式更改，因为我们所有的开关都使用自定义样式。switch
<div class="form-check form-switch">
<input class="form-check-input" type="checkbox" value="" id="checkNativeSwitch" switch>
<label class="form-check-label" for="checkNativeSwitch">
Native switch haptics
</label>
</div>请务必在 WebKit 博客上阅读有关 switch 属性的更多信息。macOS 和 iOS 上的 Safari 17.4+ 在 HTML 中都有本机样式的开关，而其他浏览器只是回退到标准复选框外观。在较新版本的 Safari 中将该属性应用于非 Bootstrap 复选框将呈现本机开关。
默认（堆叠）
默认情况下，任意数量的直系同级复选框和单选将垂直堆叠并适当间距。.form-check
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="defaultCheck1">
<label class="form-check-label" for="defaultCheck1">
Default checkbox
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="defaultCheck2" disabled>
<label class="form-check-label" for="defaultCheck2">
Disabled checkbox
</label>
</div><div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios1" value="option1" checked>
<label class="form-check-label" for="exampleRadios1">
Default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios2" value="option2">
<label class="form-check-label" for="exampleRadios2">
Second default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios3" value="option3" disabled>
<label class="form-check-label" for="exampleRadios3">
Disabled radio
</label>
</div>内嵌
通过将任何 ..form-check-inline.form-check
<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox1" value="option1">
<label class="form-check-label" for="inlineCheckbox1">1</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox2" value="option2">
<label class="form-check-label" for="inlineCheckbox2">2</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox3" value="option3" disabled>
<label class="form-check-label" for="inlineCheckbox3">3 (disabled)</label>
</div><div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1">
<label class="form-check-label" for="inlineRadio1">1</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio2" value="option2">
<label class="form-check-label" for="inlineRadio2">2</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio3" value="option3" disabled>
<label class="form-check-label" for="inlineRadio3">3 (disabled)</label>
</div>反向
将复选框、radios和开关放在带有修饰符类的另一侧。.form-check-reverse
<div class="form-check form-check-reverse">
<input class="form-check-input" type="checkbox" value="" id="reverseCheck1">
<label class="form-check-label" for="reverseCheck1">
Reverse checkbox
</label>
</div>
<div class="form-check form-check-reverse">
<input class="form-check-input" type="checkbox" value="" id="reverseCheck2" disabled>
<label class="form-check-label" for="reverseCheck2">
Disabled reverse checkbox
</label>
</div>
<div class="form-check form-switch form-check-reverse">
<input class="form-check-input" type="checkbox" id="switchCheckReverse">
<label class="form-check-label" for="switchCheckReverse">Reverse switch checkbox input</label>
</div>无标签
省略没有标签文本的复选框和单选的换行。请记住，仍为辅助技术提供某种形式的可访问名称（例如，使用 ）。有关详细信息，请参阅表单概述辅助功能部分。.form-checkaria-label
<div>
<input class="form-check-input" type="checkbox" id="checkboxNoLabel" value="" aria-label="...">
</div>
<div>
<input class="form-check-input" type="radio" name="radioNoLabel" id="radioNoLabel1" value="" aria-label="...">
</div>切换按钮
使用样式而不是在元素上创建类似按钮的复选框和单选按钮。如果需要，可以进一步将这些切换按钮分组到一个按钮组中。.btn.form-check-label<label>
复选框切换按钮
<input type="checkbox" class="btn-check" id="btn-check" autocomplete="off">
<label class="btn btn-primary" for="btn-check">Single toggle</label>
<input type="checkbox" class="btn-check" id="btn-check-2" checked autocomplete="off">
<label class="btn btn-primary" for="btn-check-2">Checked</label>
<input type="checkbox" class="btn-check" id="btn-check-3" autocomplete="off" disabled>
<label class="btn btn-primary" for="btn-check-3">Disabled</label><input type="checkbox" class="btn-check" id="btn-check-4" autocomplete="off">
<label class="btn" for="btn-check-4">Single toggle</label>
<input type="checkbox" class="btn-check" id="btn-check-5" checked autocomplete="off">
<label class="btn" for="btn-check-5">Checked</label>
<input type="checkbox" class="btn-check" id="btn-check-6" autocomplete="off" disabled>
<label class="btn" for="btn-check-6">Disabled</label>从视觉上看，这些复选框切换按钮与按钮插件切换按钮相同。然而，辅助技术对它们的传达方式不同：复选框切换将由屏幕阅读器宣布为“选中”/“未选中”（因为尽管它们看起来如此，但它们基本上仍然是复选框），而按钮插件切换按钮将被宣布为“按钮”/“按钮按下”。这两种方法之间的选择将取决于您正在创建的切换类型，以及当切换作为复选框或实际按钮宣布时，该切换对用户是否有意义。
单选切换按钮
<input type="radio" class="btn-check" name="options" id="option1" autocomplete="off" checked>
<label class="btn btn-secondary" for="option1">Checked</label>
<input type="radio" class="btn-check" name="options" id="option2" autocomplete="off">
<label class="btn btn-secondary" for="option2">Radio</label>
<input type="radio" class="btn-check" name="options" id="option3" autocomplete="off" disabled>
<label class="btn btn-secondary" for="option3">Disabled</label>
<input type="radio" class="btn-check" name="options" id="option4" autocomplete="off">
<label class="btn btn-secondary" for="option4">Radio</label><input type="radio" class="btn-check" name="options-base" id="option5" autocomplete="off" checked>
<label class="btn" for="option5">Checked</label>
<input type="radio" class="btn-check" name="options-base" id="option6" autocomplete="off">
<label class="btn" for="option6">Radio</label>
<input type="radio" class="btn-check" name="options-base" id="option7" autocomplete="off" disabled>
<label class="btn" for="option7">Disabled</label>
<input type="radio" class="btn-check" name="options-base" id="option8" autocomplete="off">
<label class="btn" for="option8">Radio</label>轮廓样式
支持的不同变体，例如各种轮廓样式。.btn
<input type="checkbox" class="btn-check" id="btn-check-outlined" autocomplete="off">
<label class="btn btn-outline-primary" for="btn-check-outlined">Single toggle</label><br>
<input type="checkbox" class="btn-check" id="btn-check-2-outlined" checked autocomplete="off">
<label class="btn btn-outline-secondary" for="btn-check-2-outlined">Checked</label><br>
<input type="radio" class="btn-check" name="options-outlined" id="success-outlined" autocomplete="off" checked>
<label class="btn btn-outline-success" for="success-outlined">Checked success radio</label>
<input type="radio" class="btn-check" name="options-outlined" id="danger-outlined" autocomplete="off">
<label class="btn btn-outline-danger" for="danger-outlined">Danger radio</label>CSS系统
Sass 变量
检查变量：
$form-check-input-width: 1em;
$form-check-min-height: $font-size-base * $line-height-base;
$form-check-padding-start: $form-check-input-width + .5em;
$form-check-margin-bottom: .125rem;
$form-check-label-color: null;
$form-check-label-cursor: null;
$form-check-transition: null;
$form-check-input-active-filter: brightness(90%);
$form-check-input-bg: $input-bg;
$form-check-input-border: var(--#{$prefix}border-width) solid var(--#{$prefix}border-color);
$form-check-input-border-radius: .25em;
$form-check-radio-border-radius: 50%;
$form-check-input-focus-border: $input-focus-border-color;
$form-check-input-focus-box-shadow: $focus-ring-box-shadow;
$form-check-input-checked-color: $component-active-color;
$form-check-input-checked-bg-color: $component-active-bg;
$form-check-input-checked-border-color: $form-check-input-checked-bg-color;
$form-check-input-checked-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$form-check-input-checked-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/></svg>");
$form-check-radio-checked-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='2' fill='#{$form-check-input-checked-color}'/></svg>");
$form-check-input-indeterminate-color: $component-active-color;
$form-check-input-indeterminate-bg-color: $component-active-bg;
$form-check-input-indeterminate-border-color: $form-check-input-indeterminate-bg-color;
$form-check-input-indeterminate-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$form-check-input-indeterminate-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10h8'/></svg>");
$form-check-input-disabled-opacity: .5;
$form-check-label-disabled-opacity: $form-check-input-disabled-opacity;
$form-check-btn-check-disabled-opacity: $btn-disabled-opacity;
$form-check-inline-margin-end: 1rem;
开关变量：
$form-switch-color: rgba($black, .25);
$form-switch-width: 2em;
$form-switch-padding-start: $form-switch-width + .5em;
$form-switch-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color}'/></svg>");
$form-switch-border-radius: $form-switch-width;
$form-switch-transition: background-position .15s ease-in-out;
$form-switch-focus-color: $input-focus-border-color;
$form-switch-focus-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-focus-color}'/></svg>");
$form-switch-checked-color: $component-active-color;
$form-switch-checked-bg-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-checked-color}'/></svg>");
$form-switch-checked-bg-position: right center;