String.fromCharCode not return all values

Question

I'm trying to alert any key-pressed :

alert(String.fromCharCode(e.which));

Seems to work for AZ az characters but not for any other characters.

My goal is to make it work for any character (WYSIWYG).

Answer 1

You can manually provide your own mappings, see my jsfiddle example: https://jsfiddle.net/Glogo/dab3hzz7/1/

sample code:

function myStringFromCharCode(which) {
    var strKey = String.fromCharCode(which);

    switch(which) {
        case 13: return "Shift"
        case 17: return "Ctrl"
        case 18: return "Alt"
        // add more mappings here ...
    }

    return strKey;    
}

function myOnKeyUp(e) {
    alert(e.which + "=" + myStringFromCharCode(e.which));
}

document.body.onkeyup=myOnKeyUp;