Watch out for context part 3

context_pitfall_ex3.js

var el = document.getElementById('showCounterTrigger');
el.onclick = function(evt) { logger.getCounter() }

// if you're operating in ECMA5 environment (webkit or gecko)
// you can also use bind() (more about bind below)

el.onclick = logger.getCounter.bind(logger);

// just remember that every event callback has an event object 
// passed as a first parameter, so be careful when reusing methods