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核取方塊和單選按鈕

使用我們完全改寫的核取方塊元件,建立一致的跨瀏覽器和跨裝置核取方塊和單選按鈕。

方法

瀏覽器預設的核取方塊和單選按鈕已使用 .form-check 取代,這是針對兩種輸入類型的一系列類別,可改善其 HTML 元素的配置和行為,提供更佳的自訂功能和跨瀏覽器一致性。核取方塊用於在清單中選取一個或多個選項,而單選按鈕用於從多個選項中選取一個選項。

在結構上,我們的 <input><label> 是同層元素,而不是 <label> 中的 <input>。這稍微冗長一些,因為您必須指定 idfor 屬性來關聯 <input><label>。我們對所有 <input> 狀態(例如 :checked:disabled)使用同層選擇器 (~)。當與 .form-check-label 類別結合使用時,我們可以根據 <input> 的狀態輕鬆設定每個項目的文字樣式。

我們的核取方塊使用自訂的 Bootstrap 圖示來表示已勾選或不確定狀態。

核取方塊

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>

不確定

當透過 JavaScript 手動設定時,核取方塊可以使用 :indeterminate 偽類別(沒有可用的 HTML 屬性可以指定它)。

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>

已停用

加入 disabled 屬性,關聯的 <label> 會自動套用樣式,以較淺的顏色顯示,以幫助表示輸入的狀態。

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>

無線電按鈕

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>

已停用

加入 disabled 屬性,關聯的 <label> 會自動套用樣式,以較淺的顏色顯示,以幫助表示輸入的狀態。

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

開關具有自訂核取方塊的標記,但使用 .form-switch 類別來呈現一個切換開關。考慮使用 role="switch" 來更準確地傳達控制項的性質給支援此角色的輔助技術。在較舊的輔助技術中,它將僅作為常規核取方塊作為備用選項宣布。開關也支援 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>

預設(堆疊)

預設情況下,任何數量的核取方塊和單選按鈕,如果為立即相鄰兄弟元素,將會垂直堆疊,並適當地使用 .form-check 間距。

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>

內嵌

透過將 .form-check-inline 加入任何 .form-check,將核取方塊或單選按鈕群組在同一水平列上。

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>

反向

使用 .form-check-reverse 修改器類別,將核取方塊、單選按鈕和開關置於相反側。

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

對於沒有標籤文字的核取方塊和無線按鈕,請省略包裝的 .form-check。請記得仍提供某種無障礙技術的無障礙名稱(例如,使用 aria-label)。有關詳細資訊,請參閱 表單概觀無障礙 區段。

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

<label> 元素上使用 .btn 樣式,而不是 .form-check-label,來建立類似按鈕的核取方塊和無線按鈕。如有需要,這些切換按鈕可以進一步分組在 按鈕群組 中。

核取方塊切換按鈕

html
<input type="checkbox" class="btn-check" id="btn-check" autocomplete="off">
<label class="btn btn-primary" for="btn-check">Single toggle</label>

<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>
html
<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>
在視覺上,這些核取方塊切換按鈕與 按鈕外掛程式切換按鈕 相同。但是,輔助技術傳達的方式不同:螢幕閱讀器會將核取方塊切換宣布為「已選取」/「未選取」(因為儘管它們的外觀,它們在根本上仍然是核取方塊),而按鈕外掛程式切換按鈕將宣布為「按鈕」/「已按下按鈕」。這兩種方法的選擇取決於您建立的切換類型,以及在宣布為核取方塊或實際按鈕時,切換是否對使用者有意義。

無線電切換按鈕

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>
html
<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>

外框樣式

支援不同變形的 .btn,例如各種外框樣式。



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>

CSS

Sass 變數

核取方塊變數

$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;

開關變數

$form-switch-color:               rgba($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;