Answers for "add keypress event javascript"

js when key is pressed

document.addEventListener("keypress", function(event) {
	// do stuff
});

keypress javascript

The keypress event has been deprecated, 
you should look to use beforeinput : https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/beforeinput_event
or keydown : https://developer.mozilla.org/en-US/docs/Web/API/Document/keydown_event
instead.

(And don't forget to like answers that help you !)

adding event listener keypress event in javascript

let msg = document.getDocumentById('#message');

msg.addEventListener("keydown", (event) => {
    // handle keydown
});

msg.addEventListener("keypress", (event) => {
    // handle keypress
});

msg.addEventListener("keyup", (event) => {
    // handle keyup
});