Lesson 21 Confused

econophil · December 5th, 2012, 03:42 PM

Jeremy,

I'm getting lost at the beginning of Lesson 21. What's the relation between

Quote:

eventUtility.addEvent(document, "click", function(event) {alert(event);});

(p. 205)

and

Quote:

eventUtility.addEvent(link, "click", func);

(p. 203)?

I guess what I'm not understanding is:

Quote:

In actuality, the functions you wire to events should accept one argument, because...the browser passes an Event object to the function handling an event....

The eventutility, I thought, was built to assign a function (like addDigit) to the event. Why would we want to assign this alert to the event?

Are you saying the code on p 203,

Quote:

onload=function()

really should have an argument?

Thanks.

jmcpeak · January 7th, 2013, 11:42 AM

You don't have to specify the parameter if you don't need it. Most of the time, however, you'll it defined even if it's not used. It's a practice the majority of people follow.