Question

I have code similar to this:

$("#some-input").keyup(function (event) {
  var availableKeys = [".", ",", ";"];
  var key = String.fromCharCode(event.which);
  if (availableKeys.indexOf(key) != -1) {
    alert("Derp");
  }
});

However it does not work as I expected. The event.which/fromCharCode combination works like this properly on digits or letters (capital ones) and this is the correct behaviour since (I presume) event keycodes are different than charset entries.

Is there a workaround other than directly specifying keycodes for comparison (keeping the array of characters is a priority)?

Answer 1

You could use keypress instead. Like

$("#some-input").bind('keypress', function(e) {
    var availableKeys = [".", ",", ";"];

    if(availableKeys.indexOf( String.fromCharCode( e.which ) ) > -1 ) {
        alert('Derp');
    }
});