If I collapse or expand “id-1” then the handlers work correctly.
If I collapse or expand “id-1-1” then two handlers are triggered: one for “id-1” and the second for “id-1-1”.
Why is the event fired for “id-1” even though no action is taking place?
const myCollapsible = document.querySelectorAll('.collapse');
myCollapsible.forEach(myOne => {
myOne.addEventListener('shown.bs.collapse', function() {
console.log('shown ' + this.id);
});
myOne.addEventListener('hidden.bs.collapse', function() {
console.log('hidden ' + this.id);
});
});<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.2/font/bootstrap-icons.css">
</head>
<body>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1"></a>
<a href="#">id-1</a>
<div class="collapse ms-4" id="id-1">
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-1"></a>
<a href="#">id-1-1</a>
<div class="collapse ms-4" id="id-1-1">
text
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-2"></a>
<a href="#">id-1-2</a>
<div class="collapse ms-4" id="id-1-2">
text
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-3"></a>
<a href="#">id-1-3</a>
<div class="collapse ms-4" id="id-1-3">
text
</div>
</div>
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-2"></a>
<a href="#">id-2</a>
<div class="collapse ms-4" id="id-2">
text
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>Advertisement
Answer
You need to e.stopPropagation() from your child to top level parent.
You can find more on stopPropagation
const myCollapsible = document.querySelectorAll('.collapse');
myCollapsible.forEach(myOne => {
myOne.addEventListener('shown.bs.collapse', function(e) {
e.stopPropagation();
console.log('shown ' + this.id);
});
myOne.addEventListener('hidden.bs.collapse', function(e) {
e.stopPropagation();
console.log('hidden ' + this.id);
});
});<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.2/font/bootstrap-icons.css">
</head>
<body>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1"></a>
<a href="#">id-1</a>
<div class="collapse ms-4" id="id-1">
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-1"></a>
<a href="#">id-1-1</a>
<div class="collapse ms-4" id="id-1-1">
text
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-2"></a>
<a href="#">id-1-2</a>
<div class="collapse ms-4" id="id-1-2">
text
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-3"></a>
<a href="#">id-1-3</a>
<div class="collapse ms-4" id="id-1-3">
text
</div>
</div>
</div>
</div>
<div>
<a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-2"></a>
<a href="#">id-2</a>
<div class="collapse ms-4" id="id-2">
text
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>