How to handle the modal closing event in Twitter Bootstrap?

Modal Closing Event in Twitter Bootstrap | Set 1

Prerequisite Knowledge: Bootstrap 4 | Modal

Twitter Bootstrap’s modal class offer a few events that are fired at the standard Bootstrap modal class. Bootstrap Modals offer a lightweight, multi-purpose JavaScript popup that is customizable and responsive. They can be used to display alert popups, videos, and images in a website. Bootstrap Modals are divided into three primary sections: header, body, and footer.

The Bootstrap Events are: show.bs.modal, shown.bs.modal, hide.bs.modal, hidden.bs.modal etc. Out of all these events, we are interested in the hide.bs.modal and hidden.bs.modal events.

hide.bs.modal: This event is fired immediately when the hide instance method has been called.
hidden.bs.modal: This event is fired when the modal has finished being hidden from the user and will then wait for CSS transitions to complete.

Example:

HTML

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

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,
            initial-scale=1, shrink-to-fit=no">

    <!-- link to Bootstrap CSS CDN -->
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
        integrity=
"sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm"
        crossorigin="anonymous">

    <title>
        Modal closing event in Bootstrap
    </title>

    <style>
        h1,
        h6 {
            margin: 2%;
        }

        .btn {
            margin-left: 2%;
        }
    </style>
</head>

<body>
    <center>
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>

        <!-- Button trigger modal -->
        <button type="button" class="btn btn-primary"
            data-toggle="modal" data-target="#gfgModal">
            Launch Modal
        </button>

        <!-- Modal -->
        <div class="modal fade" id="gfgModal" tabindex="-1"
            role="dialog" aria-labelledby="gfgModalLabel"
            aria-hidden="true">
            <div class="modal-dialog" role="document">
                <div class="modal-content">
                    <div class="modal-header">
                        <h6 class="modal-title" 
                                id="gfgModalLabel" 
                                style="color:green;">
                            GeeksforGeeks
                        </h6>
                        
                        <!-- The title of the modal -->
                        <button type="button" class="close" 
                                data-dismiss="modal" 
                                aria-label="Close">
                            <span aria-hidden="true">×</span>
                        </button>
                    </div>

                    <div class="modal-body">

                        <!-- The content inside the modal box -->
                        
<p>
                            Articles that need little modification/
                            improvement from reviewers are published 
                            first. To quickly get your articles 
                            reviewed, please refer existing articles, 
                            their formating style, coding style, and
                            try to make your close to them.
                        </p>

                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-secondary"
                                data-dismiss="modal">Close</button>

                        <!-- The close button in the bottom
                             of the modal -->
                        <button type="button" class="btn btn-primary">
                            okay
                        </button>
                        <!-- The save changes button in 
                            the bottom of the modal -->
                    </div>
                </div>
            </div>
        </div>

        <!-- Optional JavaScript -->
        <!-- jQuery first, then Popper.js, then Bootstrap JS -->
        <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
            integrity=
"sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
            crossorigin="anonymous">
        </script>
        
        <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
            integrity=
"sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" 
            crossorigin="anonymous">
        </script>
        
        <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
            integrity=
"sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
            crossorigin="anonymous">
        </script>
    </center>

    <!-- Modal JQUERY logic -->
    <script type="text/javascript">
        $('#gfgModal').on('hidden.bs.modal', function (e) {

            // Fire a function in the console
            console.log('Function executed when gfgModal closed');
            
            // Alert the user
            alert('Alert fired when gfgModal closed')
        })
    </script>
</body>

</html>

Output:

Before Clicking the Button:

After Clicking the Button:

On closing modal, observe the console:

So when modal is closed, we successfully handle it using

Fire an output in the console
Alert the user

How to handle the modal closing event in Twitter Bootstrap?

Explore