<!DOCTYPE html>
<html>
<body>

<p>Click the button to display a dialog box which will ask for your favorite drink.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var text;
    var favDrink = prompt("What's your favorite cocktail drink?", "Daiquiri");
    switch(favDrink) {
        case "Martini":
            text = "Excellent choice. Martini is good for your soul.";
            break;
         case "Daiquiri":
            text = "Daiquiri is my favorite too!";
            break;
         case "Cosmopolitan":
            text = "Really? Are you sure the Cosmopolitan is your favorite?";
            break;
         default:
            text = "I have never heard of that one..";
    }
    document.getElementById("demo").innerHTML = text;
}
</script>

</body>
</html>