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JavaScript Prevent typing letters on input not working on mobile.

I recently noticed that my website input validation of prevention of letter typing is not working on mobile. I can freely type anything on the input. While on desktop, it works just fine. What should I do?

JavaScript:
function validateNumber(event) {
  var key = event ? event.keyCode : event.which;
  if (event.keyCode === 8 || event.keyCode === 46) {
    return true;
  } else if (key < 48 || key > 57) {
    return false;
  } else {
    return true;
  }
}
 
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