The Window prompt() method displays a dialog box that prompts the user for input.

<button onclick="my_function()">What's your name?</button>

<!-- html element to place output -->
<p id="my_output"></p>

When the above button is clicked by the user, it calls the function below which brings up a dialog box asking the question. The user then inputs their name and when they click “OK” it is written to the page.

// function
function my_function() {
    let user_name = prompt('Please enter your name', 'John Doe');
    if (user_name != null) {
    document.getElementById('my_output').innerHTML =
    'Hello ' + user_name + '!';
    }
}

Johnny Shay

prompt(text, defaultText)