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How to launch Bootstrap modal on page load?

Bootstrap Modals are used for some confirmation messages, some warnings, or cookies. Bootstrap 5 provides an easy way to create these models. These Modals can be automatically launched or can be triggered with the help of links and buttons. So let us create a modal using Bootstrap 5.

Creating a Modal

  • To create a modal use the .modal class along with some id used for toggling the modal.
  • The content can be added within the .modal-content class wrapped in the .modal-dialogue class.
  • The modal heading can be added using the .modal-title class within the .modal-header.
  • Further add contents to .modal-body and .modal-footer class.

Here, we will use data attributes to toggle the modal. Use .data-bs-toggle="modal" within <button> to toggle the modal and use .data-bs-target attribute which points the id of modal class.

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap </title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet"> 
  <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.min.js" integrity="sha384-Atwg2Pkwv9vp0ygtn1JAojH0nYbwNJLPhwyoVbhoPwBhjQPR5VtM2+xf0Uwh9KtT" crossorigin="anonymous"></script></head>
<body>
    
	<!-- Button trigger modal -->
	<button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#exampleModal">
	  Launch demo modal
	</button>

	<!-- Modal -->
	<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
	  <div class="modal-dialog">
		<div class="modal-content">
		  <div class="modal-header">
			<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
			<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
		  </div>
		  <div class="modal-body">
			...
		  </div>
		  <div class="modal-footer">
			<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
			<button type="button" class="btn btn-primary">Save changes</button>
		  </div>
		</div>
	  </div>
	</div>

</body>
</html>

Output:

When we click on the button the modal appears on the screen.

modal

Launch Modal on page loading

In the above program, we have used buttons to hide and show modal. But what if we want to launch the modal automatically while loading the page. It is possible to launch the modal automatically on page load using bootstrap 5.

Use the following Javascript code to launch the modal automatically without any click.

var myModal = new bootstrap.Modal(document.getElementById('myModal'), {})
myModal.show()

Let's see an example to launch the modal automatically using the above code in Bootstrap 5.

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap </title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet"> 
  <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.min.js" integrity="sha384-Atwg2Pkwv9vp0ygtn1JAojH0nYbwNJLPhwyoVbhoPwBhjQPR5VtM2+xf0Uwh9KtT" crossorigin="anonymous"></script></head>
<body>
   
	<!-- Modal -->
	<div class="modal fade" id="myModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
	  <div class="modal-dialog">
		<div class="modal-content">
		  <div class="modal-header">
			<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
			<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
		  </div>
		  <div class="modal-body">
			...
		  </div>
		  <div class="modal-footer">
			<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
			<button type="button" class="btn btn-primary">Save changes</button>
		  </div>
		</div>
	  </div>
	</div>
<script>
var myModal = new bootstrap.Modal(document.getElementById('myModal'), {})
myModal.show()
</script>
</body>
</html>

Output:

Here is the output of the above code.

launch modal automatically