- Tags: JS Window
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
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 + '!';
}
}
Output
Johnny Shay
Syntax
prompt(text, defaultText)
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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