Where is the problem?

Question

var txt = document.getElementById("txt"),
res = document.getElementById("res");

txt.onkeyup = function () {

res.innerHTML = txt.value;

}

//Error can not set property onkeyup of 'null'

Answer 1

If you trying to run this code on the playground then you can find the answer in one of these:

https://www.sololearn.com/discuss/1640793/?ref=app
https://www.sololearn.com/discuss/612424/?ref=app
https://www.sololearn.com/discuss/259009/?ref=app
https://www.sololearn.com/discuss/276929/?ref=app
https://www.sololearn.com/discuss/1229047/?ref=app
https://www.sololearn.com/discuss/1469777/?ref=app
https://www.sololearn.com/discuss/1379357/?ref=app
https://www.sololearn.com/discuss/1733139/?ref=app
https://www.sololearn.com/discuss/5067/?ref=app
https://www.sololearn.com/discuss/1218303/?ref=app
https://www.sololearn.com/discuss/261854/?ref=app

Answer 2

Burey thanks