`String.fromCharCode(keyCode)` doesn't work in Firefox - firefox

Question

String.fromCharCode(keyCode) doesn't work in Firefox.
For example
I press the semicolon key and it throws the 1/4 sign.
The number pad throws letters.
I am using this to do some field validation, because the event.key attrubute is not supported in FF.

Answer 1

Use event.which for FF. You can refer to this example

Answer 2

Keycode is the numeric identifier of the key on the keyboard. It's pretty much completely unrelated to the charcode, which is the Unicode codepoint of the character produced.
So using a keycode as an argument to fromCharCode will almost certainly give you garbage.
What are you actually trying to do with the keycode, and why?

Answer 3

Instead of event.keyCode try event.charCode. It will work in chrome and firefox.

Answer 4

$('#Name_Var').keypress(function (event) {
event = event || window.event;
var charCode = event.which || event.keyCode;
var charStr = String.fromCharCode(charCode);
// FireFox key Del - Supr - Up - Down - Left - Right
if (event.key !== undefined && event.charCode === 0) {
return;
}
//Only Num
if (!/^([0-9])*$/.test(charStr)) {
event.preventDefault();
}
//Num and letters
if (!/^[a-zA-Z0-9]+$/.test(charStr)) {
event.preventDefault();
}
});