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支票和收音機

使用我們完全重寫的檢查組件創建一致的跨瀏覽器和跨設備複選框和無線電。

在本頁面

方法

瀏覽器默認複選框和單選在 的幫助下被替換，.form-check這兩種輸入類型的一系列類改進了它們的 HTML 元素的佈局和行為，提供了更大的自定義和跨瀏覽器的一致性。複選框用於在列表中選擇一個或多個選項，而單選框用於從多個選項中選擇一個。

在結構上，我們<input>的 s 和<label>s 是兄弟元素，而不是 a <input>within a <label>。這稍微有點冗長，因為您必須指定id和for屬性來關聯<input>和<label>。我們對所有狀態都使用同級選擇器 ( ~) <input>，例如:checkedor :disabled。當與.form-check-label類結合時，我們可以輕鬆地根據<input>的狀態為每個項目設置文本樣式。

我們的檢查使用自定義引導圖標來指示檢查或不確定狀態。

檢查

html 
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckDefault">
  <label class="form-check-label" for="flexCheckDefault">
    Default checkbox
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckChecked" checked>
  <label class="form-check-label" for="flexCheckChecked">
    Checked checkbox
  </label>
</div>

不定

當通過 JavaScript 手動設置複選框:indeterminate時，可以使用偽類（沒有可用的 HTML 屬性來指定它）。

html 
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckIndeterminate">
  <label class="form-check-label" for="flexCheckIndeterminate">
    Indeterminate checkbox
  </label>
</div>

已禁用

添加disabled屬性，關聯<label>的 s 會自動設置樣式以匹配較淺的顏色，以幫助指示輸入的狀態。

html 
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckIndeterminateDisabled" disabled>
  <label class="form-check-label" for="flexCheckIndeterminateDisabled">
    Disabled indeterminate checkbox
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckDisabled" disabled>
  <label class="form-check-label" for="flexCheckDisabled">
    Disabled checkbox
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckCheckedDisabled" checked disabled>
  <label class="form-check-label" for="flexCheckCheckedDisabled">
    Disabled checked checkbox
  </label>
</div>

收音機

html 
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDefault" id="flexRadioDefault1">
  <label class="form-check-label" for="flexRadioDefault1">
    Default radio
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDefault" id="flexRadioDefault2" checked>
  <label class="form-check-label" for="flexRadioDefault2">
    Default checked radio
  </label>
</div>

已禁用

添加disabled屬性，關聯<label>的 s 會自動設置樣式以匹配較淺的顏色，以幫助指示輸入的狀態。

html 
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDisabled" id="flexRadioDisabled" disabled>
  <label class="form-check-label" for="flexRadioDisabled">
    Disabled radio
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="radio" name="flexRadioDisabled" id="flexRadioCheckedDisabled" checked disabled>
  <label class="form-check-label" for="flexRadioCheckedDisabled">
    Disabled checked radio
  </label>
</div>

開關

開關具有自定義復選框的標記，但使用.form-switch該類來呈現切換開關。考慮使用role="switch"更準確地將控件的性質傳達給支持此角色的輔助技術。在較舊的輔助技術中，它只會作為一個常規複選框被宣佈為後備。開關也支持該disabled屬性。

html 
<div class="form-check form-switch">
  <input class="form-check-input" type="checkbox" role="switch" id="flexSwitchCheckDefault">
  <label class="form-check-label" for="flexSwitchCheckDefault">Default switch checkbox input</label>
</div>
<div class="form-check form-switch">
  <input class="form-check-input" type="checkbox" role="switch" id="flexSwitchCheckChecked" checked>
  <label class="form-check-label" for="flexSwitchCheckChecked">Checked switch checkbox input</label>
</div>
<div class="form-check form-switch">
  <input class="form-check-input" type="checkbox" role="switch" id="flexSwitchCheckDisabled" disabled>
  <label class="form-check-label" for="flexSwitchCheckDisabled">Disabled switch checkbox input</label>
</div>
<div class="form-check form-switch">
  <input class="form-check-input" type="checkbox" role="switch" id="flexSwitchCheckCheckedDisabled" checked disabled>
  <label class="form-check-label" for="flexSwitchCheckCheckedDisabled">Disabled checked switch checkbox input</label>
</div>

默認（堆疊）

默認情況下，任何數量的直接同級複選框和單選都將垂直堆疊並以.form-check.

html 
<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>
html 
<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>

排隊

通過添加.form-check-inline任何.form-check.

html 
<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>
html 
<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>

撤銷

.form-check-reverse將您的複選框、收音機和開關與修飾符類放在對面。

html 
<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="flexSwitchCheckReverse">
  <label class="form-check-label" for="flexSwitchCheckReverse">Reverse switch checkbox input</label>
</div>

無標籤

省略.form-check沒有標籤文本的複選框和單選框的換行。請記住，仍然為輔助技術提供某種形式的可訪問名稱（例如， using aria-label）。有關詳細信息，請參閱表單概述可訪問性部分。

html 
<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>

切換按鈕

.btn通過使用樣式而不是元素.form-check-label來創建類似按鈕的複選框和單選按鈕。如果需要<label>，這些切換按鈕可以進一步分組到按鈕組中。

複選框切換按鈕

html 
<input type="checkbox" class="btn-check" id="btn-check" autocomplete="off">
<label class="btn btn-primary" for="btn-check">Single toggle</label>
html 
<input type="checkbox" class="btn-check" id="btn-check-2" checked autocomplete="off">
<label class="btn btn-primary" for="btn-check-2">Checked</label>
html 
<input type="checkbox" class="btn-check" id="btn-check-3" autocomplete="off" disabled>
<label class="btn btn-primary" for="btn-check-3">Disabled</label>
在視覺上，這些複選框切換按鈕與 按鈕插件切換按鈕相同。然而，輔助技術以不同的方式傳達它們：屏幕閱讀器將宣布複選框切換為“選中”/“未選中”（因為儘管它們出現，但它們基本上仍然是複選框），而按鈕插件切換按鈕將是宣佈為“按鈕”/“按下按鈕”。這兩種方法之間的選擇將取決於您創建的切換類型，以及當作為複選框或實際按鈕宣佈時，切換是否對用戶有意義。

單選切換按鈕

html 
<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>

輪廓樣式

支持不同的變體.btn，例如各種輪廓樣式。



html 
<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>

薩斯

變量

$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;
$form-check-input-border:                 1px solid rgba($black, .25);
$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:       $input-btn-focus-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;