A text field monitoring plugin for jQuery

jquery.monitor.js

  (function($) {
    return $.fn.monitor = function(fn) {
      var changed, currentVal, cycle, lastVal, timeout,
        _this = this;
      currentVal = this.val();
      lastVal = currentVal;
      timeout = null;
      changed = function() {
        return currentVal !== lastVal;
      };
      cycle = function() {
        currentVal = _this.val();
        if (changed()) fn(currentVal);
        lastVal = currentVal;
        return timeout = setTimeout(cycle, 1000);
      };
      this.keyup(function() {
        clearTimeout(timeout);
        return cycle();
      });
      return cycle();
    };
  })(jQuery);

jquery.monitor.js.coffee

(($) ->
  $.fn.monitor = (fn) ->
    currentVal = @val()
    lastVal = currentVal
    timeout = null

    changed = () =>
      currentVal != lastVal

    cycle = () =>
      currentVal = @val()
      fn(currentVal) if (changed())
      lastVal = currentVal
      timeout = setTimeout cycle, 1000

    @keyup () ->
      clearTimeout(timeout)
      cycle()

    cycle()
)(jQuery)

can you provide the sample code using this plugin?