$(document).on('keyup','input,textarea',$.debounce(600, editor.handleGlobalChange));

$('#afield').off('keyup');

$('#afield').on('keyup',function(e) {
    e.stopImmediatePropagation();
});

$(document).on('keyup','input,textarea,not([data-nokeyup]',$.debounce(600, editor.handleGlobalChange));

$(document).on('keyup','input,textarea', function (event) {
  if( event.type === 'sometype' && this === someElement ) {
    return;
  }
  $.debounce(600, editor.handleGlobalChange).call(this, event);
});

$(document).on('keyup','input,textarea',$.debounce(600, editor.handleGlobalChange));
$('#afield').ignore('keyup');

makeNoise = ->
  $('pre').append "You typed!<br>"

# 4-line jQuery plugin
$.fn.ignore = (eventType) ->
  $(this).each ->
    $(this).on eventType, (event) ->
      event.stopPropagation();

$ ->
  # General event handler for all inputs
  $(document).on 'keyup', 'input', makeNoise

  # Exempt a specific element
  $('#quiet').ignore 'keyup'

  # Handlers added *directly* to the #quiet element
  # are still called, only the bubbling is silenced.
  $('#quiet').on 'keyup', ->
    alert "Shhhh!"
     ​

$fields = $( 'input' ).add( 'textarea' ).not( '#afield' );
$fields.on( 'keyup', $.debounce( 600, editor.handleGlobalChange ) );

$fields.keyup( $.debounce( 600, editor.handleGlobalChange ) );