input.html

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" href="../node_modules/bootstrap/dist/css/bootstrap.css">
        <script>
         function Add(){
             var folder = prompt("Enter Name");
             if(folder==null) {
                 document.write("You Canceled");
             } else if(folder=="") {
                 document.write("Folder Name Can't be Empty")
             } else {
                document.getElementById("msg").innerHTML += 
                "Folder Created : " + folder + "<br>";
             }
         }
        </script>
    </head>
    <body>
        <div class="container">
            <h2>Add Folder</h2>
            <button onclick="Add()" class="btn btn-primary">New Folder</button>
            <br>
            <div id="msg" class="text-center">
            </div>
        </div>
    </body>

</html>