項目
基礎知識
アコーディオンは内部的にcollapseを使って折りたたみ可能にしています。
アコーディオンを展開した状態でレンダリングするには、.accordionに.openクラスを追加します。
このコンポーネントのアニメーション効果は、
prefers-reduced-motionメディアクエリに依存します。アクセシビリティのドキュメントのモーションの低減セクション を参照してください。
例
下のアコーディオンをクリックすると、アコーディオンの内容を展開・折りたたむことができます。
This is the first item's accordion body. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
This is the second item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
This is the third item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
<div class="accordion" id="accordionExample">
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
Accordion Item #1
</button>
</h2>
<div id="collapseOne" class="accordion-collapse collapse show" data-bs-parent="#accordionExample">
<div class="accordion-body">
<strong>This is the first item's accordion body.</strong> It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
Accordion Item #2
</button>
</h2>
<div id="collapseTwo" class="accordion-collapse collapse" data-bs-parent="#accordionExample">
<div class="accordion-body">
<strong>This is the second item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
Accordion Item #3
</button>
</h2>
<div id="collapseThree" class="accordion-collapse collapse" data-bs-parent="#accordionExample">
<div class="accordion-body">
<strong>This is the third item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
</div>Flush
.accordion-flushを追加して、デフォルトのbackground-color、いくつかの境界線、およびいくつかの丸みを帯びた角を削除し、アコーディオンを親コンテナと一緒にedge-to-edgeにレンダリングします。
Placeholder content for this accordion, which is intended to demonstrate the
.accordion-flush class. This is the first item's accordion body.Placeholder content for this accordion, which is intended to demonstrate the
.accordion-flush class. This is the second item's accordion body. Let's imagine this being filled with some actual content.Placeholder content for this accordion, which is intended to demonstrate the
.accordion-flush class. This is the third item's accordion body. Nothing more exciting happening here in terms of content, but just filling up the space to make it look, at least at first glance, a bit more representative of how this would look in a real-world application.<div class="accordion accordion-flush" id="accordionFlushExample">
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseOne" aria-expanded="false" aria-controls="flush-collapseOne">
Accordion Item #1
</button>
</h2>
<div id="flush-collapseOne" class="accordion-collapse collapse" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the first item's accordion body.</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseTwo" aria-expanded="false" aria-controls="flush-collapseTwo">
Accordion Item #2
</button>
</h2>
<div id="flush-collapseTwo" class="accordion-collapse collapse" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the second item's accordion body. Let's imagine this being filled with some actual content.</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseThree" aria-expanded="false" aria-controls="flush-collapseThree">
Accordion Item #3
</button>
</h2>
<div id="flush-collapseThree" class="accordion-collapse collapse" data-bs-parent="#accordionFlushExample">
<div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the third item's accordion body. Nothing more exciting happening here in terms of content, but just filling up the space to make it look, at least at first glance, a bit more representative of how this would look in a real-world application.</div>
</div>
</div>
</div>常時オープン
各.accordion-collapseのdata-bs-parent属性を省略して、別のアイテムが開かれたときにアコーディオンアイテムが開いたままになるようにします。
This is the first item's accordion body. It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
This is the second item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
This is the third item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the
.accordion-body, though the transition does limit overflow.
<div class="accordion" id="accordionPanelsStayOpenExample">
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseOne" aria-expanded="true" aria-controls="panelsStayOpen-collapseOne">
Accordion Item #1
</button>
</h2>
<div id="panelsStayOpen-collapseOne" class="accordion-collapse collapse show">
<div class="accordion-body">
<strong>This is the first item's accordion body.</strong> It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseTwo" aria-expanded="false" aria-controls="panelsStayOpen-collapseTwo">
Accordion Item #2
</button>
</h2>
<div id="panelsStayOpen-collapseTwo" class="accordion-collapse collapse">
<div class="accordion-body">
<strong>This is the second item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header">
<button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseThree" aria-expanded="false" aria-controls="panelsStayOpen-collapseThree">
Accordion Item #3
</button>
</h2>
<div id="panelsStayOpen-collapseThree" class="accordion-collapse collapse">
<div class="accordion-body">
<strong>This is the third item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
</div>
</div>
</div>
</div>アクセシビリティ
詳しくはcollapseアクセシビリティセクションをお読みください。
CSS
変数
Added in v5.2.0Bootstrapの進化するCSS変数アプローチの一部として、アコーディオンはリアルタイムカスタマイズを強化するために、.accordionでローカルCSS変数を使用するようになりました。CSS変数の値はSass経由で設定されるので、Sassカスタマイズもまだサポートされています。
--#{$prefix}accordion-color: #{$accordion-color};
--#{$prefix}accordion-bg: #{$accordion-bg};
--#{$prefix}accordion-transition: #{$accordion-transition};
--#{$prefix}accordion-border-color: #{$accordion-border-color};
--#{$prefix}accordion-border-width: #{$accordion-border-width};
--#{$prefix}accordion-border-radius: #{$accordion-border-radius};
--#{$prefix}accordion-inner-border-radius: #{$accordion-inner-border-radius};
--#{$prefix}accordion-btn-padding-x: #{$accordion-button-padding-x};
--#{$prefix}accordion-btn-padding-y: #{$accordion-button-padding-y};
--#{$prefix}accordion-btn-color: #{$accordion-button-color};
--#{$prefix}accordion-btn-bg: #{$accordion-button-bg};
--#{$prefix}accordion-btn-icon: #{escape-svg($accordion-button-icon)};
--#{$prefix}accordion-btn-icon-width: #{$accordion-icon-width};
--#{$prefix}accordion-btn-icon-transform: #{$accordion-icon-transform};
--#{$prefix}accordion-btn-icon-transition: #{$accordion-icon-transition};
--#{$prefix}accordion-btn-active-icon: #{escape-svg($accordion-button-active-icon)};
--#{$prefix}accordion-btn-focus-border-color: #{$accordion-button-focus-border-color};
--#{$prefix}accordion-btn-focus-box-shadow: #{$accordion-button-focus-box-shadow};
--#{$prefix}accordion-body-padding-x: #{$accordion-body-padding-x};
--#{$prefix}accordion-body-padding-y: #{$accordion-body-padding-y};
--#{$prefix}accordion-active-color: #{$accordion-button-active-color};
--#{$prefix}accordion-active-bg: #{$accordion-button-active-bg};Sass変数
$accordion-padding-y: 1rem;
$accordion-padding-x: 1.25rem;
$accordion-color: var(--#{$prefix}body-color);
$accordion-bg: var(--#{$prefix}body-bg);
$accordion-border-width: var(--#{$prefix}border-width);
$accordion-border-color: var(--#{$prefix}border-color);
$accordion-border-radius: var(--#{$prefix}border-radius);
$accordion-inner-border-radius: subtract($accordion-border-radius, $accordion-border-width);
$accordion-body-padding-y: $accordion-padding-y;
$accordion-body-padding-x: $accordion-padding-x;
$accordion-button-padding-y: $accordion-padding-y;
$accordion-button-padding-x: $accordion-padding-x;
$accordion-button-color: var(--#{$prefix}body-color);
$accordion-button-bg: var(--#{$prefix}accordion-bg);
$accordion-transition: $btn-transition, border-radius .15s ease;
$accordion-button-active-bg: var(--#{$prefix}primary-bg-subtle);
$accordion-button-active-color: var(--#{$prefix}primary-text-emphasis);
$accordion-button-focus-border-color: $input-focus-border-color;
$accordion-button-focus-box-shadow: $btn-focus-box-shadow;
$accordion-icon-width: 1.25rem;
$accordion-icon-color: $body-color;
$accordion-icon-active-color: $primary-text-emphasis;
$accordion-icon-transition: transform .2s ease-in-out;
$accordion-icon-transform: rotate(-180deg);
$accordion-button-icon: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>");
$accordion-button-active-icon: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-active-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>");