How to initialize toasts with JavaScript in Bootstrap 5?

I can't initialize Bootstrap 5 Toasts.

The button to initialize the toast:

<button type="button" class="btn btn-primary" id="toastbtn">Initialize toast</button>

My JavaScript:

document.getElementById("toastbtn").onclick = function() {
        var toastElList = [].slice.call(document.querySelectorAll('.toast'))
        var toastList = toastElList.map(function(toastEl) {
          return new bootstrap.Toast(toastEl, option)
        })
      };

JSfiddle: https://jsfiddle.net/5e1t3scp/

And here's the documentation.

The JavaScript has been taken from Bootstrap's website. I tried many times but couldn't initialize it. What am I doing wrong? Thanks in advance!

Solution

Since the second parameter of the constructor is optional, it is unnecessary. However, if you would like to supply options, you should do so in the form of an object:

// Defaults according to the documentation
{
  animation: true,
  autohide: true,
  delay: 500
}

<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/css/bootstrap.min.css">
  </head>

  <body>

    <div class="container mt-5">

      <!-- button to initialize toast -->
      <button type="button" class="btn btn-primary" id="toastbtn">Initialize toast</button>

      <!-- Toast -->
      <div class="toast">
        <div class="toast-header">
          <strong class="mr-auto">Bootstrap</strong>
          <small>11 mins ago</small>
          <button type="button" class="ml-2 mb-1 close" data-dismiss="toast">
            <span>&times;</span>
          </button>
        </div>
        <div class="toast-body">
          Hello, world! This is a toast message.
        </div>
      </div>

    </div>


    <!-- Popper.js first, then Bootstrap JS -->
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/js/bootstrap.min.js"></script>
    <script>
      document.getElementById("toastbtn").onclick = function() {
        var toastElList = [].slice.call(document.querySelectorAll('.toast'))
        var toastList = toastElList.map(function(toastEl) {
        // Creates an array of toasts (it only initializes them)
          return new bootstrap.Toast(toastEl) // No need for options; use the default options
        });
       toastList.forEach(toast => toast.show()); // This show them
   
        console.log(toastList); // Testing to see if it works
      };

    </script>
  </body>

</html>