HTML text input allow only numeric input

Question

Is there a quick way to set an HTML text input () to only allow numeric keystrokes (plus \'.\')?

Answer 1

A short and sweet implementation using jQuery and replace() instead of looking at event.keyCode or event.which:

$('input.numeric').live('keyup', function(e) {
  $(this).val($(this).val().replace(/[^0-9]/g, ''));
});

Only small side effect that the typed letter appears momentarily and CTRL/CMD + A seems to behave a bit strange.