jQuery Text Change Event Plugin. Simple cross browser detection of text changes for input and textarea elements using a jQuery custom event plugin. SEE: http://www.zurb.com/playground/jquery-text-change-custom-event. Adapted to make debugging a bit easier.

gistfile1.js

/*!
 * jQuery TextChange Plugin
 * http://www.zurb.com/playground/jquery-text-change-custom-event
 *
 * Copyright 2010, ZURB
 * Released under the MIT License
 */
;(function(a) {
    a.event.special.textchange = {
        setup : function textchangeSetup() {
            a(this).data("lastValue", "true" === this.contentEditable ? a(this).html() : a(this).val());
            a(this).bind("keyup.textchange", a.event.special.textchange.handler);
            a(this).bind("cut.textchange paste.textchange input.textchange", a.event.special.textchange.delayedHandler);
        },
        teardown : function textchangeTeardown() { a(this).unbind(".textchange"); },
        handler : function textchangeHandler() { a.event.special.textchange.triggerIfChanged(a(this)); },
        delayedHandler : function textchangeDelayedHandler() {
            var c = a(this);
            setTimeout(function textchangeDelayedHandlerTimeout() { a.event.special.textchange.triggerIfChanged(c); }, 25);
        },
        triggerIfChanged : function textchangeTriggerIfChanged(a) {
            var b = "true" === a[0].contentEditable ? a.html() : a.val();
            b !== a.data("lastValue") && (a.trigger("textchange", [a.data("lastValue")]), a.data("lastValue", b));
        }
    };
    a.event.special.hastext = {
        setup : function hastextSetup() { a(this).bind("textchange", a.event.special.hastext.handler); },
        teardown : function hastextTeardown() { a(this).unbind("textchange", a.event.special.hastext.handler); },
        handler : function hastextHandler(c, b) { "" === b && b !== a(this).val() && a(this).trigger("hastext"); }
    };
    a.event.special.notext = {
        setup : function notextSetup() { a(this).bind("textchange", a.event.special.notext.handler); },
        teardown : function notextTeardown() { a(this).unbind("textchange", a.event.special.notext.handler); },
        handler : function notextHandler(c, b) { "" === a(this).val() && a(this).val() !== b && a(this).trigger("notext"); }
    };
})(jQuery);