(function() {
    var timerId = null,
        waitingTime = 2000,
        selector = 'input[type="text"],textarea',
        isValid = function(keycode) {
            return (keycode > 47 && keycode < 58) ||    // number keys
                keycode == 32 || keycode == 13 ||       // spacebar & return key(s) (if you want to allow carriage returns)
                (keycode > 64 && keycode < 91) ||       // letter keys
                (keycode > 95 && keycode < 112) ||      // numpad keys
                (keycode > 185 && keycode < 193) ||     // ;=,-./` (in order)
                (keycode > 218 && keycode < 223) ||     // [\]' (in order)
                (keycode == 46 || keycode == 8)         //delete  & backspace
        }

    $(document).on('keyup', selector, function(e) {
        if(!isValid(e.keyCode)){
            return
        }

        clearTimeout(timerId)
        if (this.value) {
            var callback = function(element) {
                var evt = new CustomEvent('finishtyping');
                element.dispatchEvent(evt)
            }.bind(null, this)
            timerId = setTimeout(callback, waitingTime)
        }
    })
})()