<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Show Bootstrap Modal on Page Load Using jQuery</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"></script>
<script>

	/*$(document).ready(function(){
		$("#myModal").modal('show');
	});*/

    $(document).ready(function() 
    {
    $("#myBtn").click(function() {
        $("#myModal").modal("show");
    });
});

</script>
</head>
<body>

<a href="#myModal" class="btn btn-lg btn-primary" data-bs-toggle="modal">Launch Demo Modal</a>
    
<button type="button" id="myBtn" class="btn btn-lg btn-primary">Launch Demo Modal</button>



<div class="m-4">
    <div id="myModal" class="modal fade" tabindex="-1">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">Confirmation</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body">
                    <p>Do you want to save changes to this document before closing?</p>
                    <p class="text-secondary"><small>If you don't save, your changes will be lost.</small></p>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
                    <button type="button" class="btn btn-primary">Save changes</button>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>