Collapsibles are useful when you want to hide and show large amount of content:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Simple Collapsible</h2>
<p>Click on the button to toggle between showing and hiding content.</p>
<button type="button" class="btn btn-primary" data-toggle="collapse" data-target="#demo">Simple collapsible</button>
<div id="demo" class="collapse">
Forget not that the earth delights to feel your bare feet and the winds long to play with your hair
</div>
</div>
</body>
</html>
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The collapsible content is hidden. However, you can add the .show class to show the content by default:
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 4 Show Collapsible Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Show Collapsible Content By Default</h2>
<button type="button" class="btn btn-primary" data-toggle="collapse" data-target="#demo">Simple collapsible</button>
<div id="demo" class="collapse show">
It was wrong to capture wild animals and confine them in captivity for people to go and gawk at them.
</div>
</div>
</body>
</html>
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Use the data-parent attribute to make sure that all collapsible elements under the specified parent will be closed when one of the collapsible item is shown.
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 4 Accordion Example</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Accordion Example</h2>
<div id="accordion">
<div class="card">
<div class="card-header">
<a class="card-link" data-toggle="collapse" href="#collapseOne">
Example 1
</a>
</div>
<div id="collapseOne" class="collapse show" data-parent="#accordion">
<div class="card-body">
studentstutorial
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<a class="collapsed card-link" data-toggle="collapse" href="#collapseTwo">
Example 2
</a>
</div>
<div id="collapseTwo" class="collapse" data-parent="#accordion">
<div class="card-body">
Bootsrtrap 4
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<a class="collapsed card-link" data-toggle="collapse" href="#collapseThree">
Example 3
</a>
</div>
<div id="collapseThree" class="collapse" data-parent="#accordion">
<div class="card-body">
Accordion Example
</div>
</div>
</div>
</div>
</div>
</body>
</html>
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