Collapse ^commun

Le principe est de pouvoir ouvrir / fermer des blocs à partir d'un interrupteur.
Tout repose sur l'animation du height d'un élément (cela implique de ne pas mettre de padding dessus).

Sur l'interrupteur (button ou a avec un rôle button), l'attribut data-bs-toggle="collapse" est requis. On cible l'élément à ouvrir via l'attribut data-bs-target="*".

Link with href Button with data-bs-target

<p class="d-inline-flex gap-1">
    <a class="btn btn-primary" data-bs-toggle="collapse" href="#collapseExample" role="button" aria-expanded="false" aria-controls="collapseExample">Link with href</a>
    <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample">Button with data-bs-target</button>
</p>
<div class="collapse" id="collapseExample">
    <div class="card card-body">
        Some placeholder content for the collapse component. This panel is hidden by default but revealed when the user activates the relevant trigger.
    </div>
</div>

Il est possible d'animer la width plutôt que la height. Il suffit d'ajouter la classe .collapse-horizontal sur l'élément .collapse.

Toggle width collapse

<p>
    <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#collapseWidthExample" aria-expanded="false" aria-controls="collapseWidthExample">Toggle width collapse</button>
</p>
<div style="min-height: 120px;">
    <div class="collapse collapse-horizontal" id="collapseWidthExample">
        <div class="card card-body" style="width: 300px;">
            This is some placeholder content for a horizontal collapse. It’s hidden by default and shown when triggered.
        </div>
    </div>
</div>

<p class="d-inline-flex gap-1">
    <a class="btn btn-primary" data-bs-toggle="collapse" href="#multiCollapseExample1" role="button" aria-expanded="false" aria-controls="multiCollapseExample1">Toggle first element</a>
    <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#multiCollapseExample2" aria-expanded="false" aria-controls="multiCollapseExample2">Toggle second element</button>
    <button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target=".multi-collapse" aria-expanded="false" aria-controls="multiCollapseExample1 multiCollapseExample2">Toggle both elements</button>
</p>
<div class="row">
    <div class="col">
        <div class="collapse multi-collapse" id="multiCollapseExample1">
            <div class="card card-body">
            Some placeholder content for the first collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
            </div>
        </div>
    </div>
    <div class="col">
        <div class="collapse multi-collapse" id="multiCollapseExample2">
            <div class="card card-body">
            Some placeholder content for the second collapse component of this multi-collapse example. This panel is hidden by default but revealed when the user activates the relevant trigger.
            </div>
        </div>
    </div>
</div>

$transition-collapse:         height .35s ease;
$transition-collapse-width:   width .35s ease;

En savoir plus