Is the shiftkey held down in JavaScript

Question

I have written a JS function that only allow numbers to be entered. A copy of that function is below:

function NumbersOnly(e) {
    var evt = e || window.eve         


        

Answer 1

use keypress for holding any key isntead of keydown

Answer 2

Use event.key instead of charCode. No more magic numbers!

function onEvent(event) {
    const key = event.key; // "a", "1", "Shift", etc.
    if (isFinite(key)) { // Is number
        // Do work
    }
};

Mozilla Docs

Supported Browsers

Answer 3

You can check if shift key is pressed using :

if(evt.shiftKey) {
 ...  //returns true if shift key is pressed