March 2006
Beginner to intermediate
448 pages
13h 33m
English
Content preview from Head Rush Ajax
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you’re on your way 4
255
developing dom apps
questions
Frequently asked
?
Q:
onClick, onChange, and now onLoad... where are all these
event handlers coming from? You seem to be pulling them out
of thin air!
A: Don’t worry if you’re not familiar with all of these event
handlers... you can look them up in any good JavaScript reference.
Now that you’re starting to work with JavaScript more, you’ll start
to learn about the different event handlers, and what each handler
does. For now, just trust us... and be on the lookout for
Head First
JavaScript, where you’ll get the full scoop on event handlers.
Q:
Isn’t there an addEventHandler() method that would be
better than working with the onclick property directly?
a: addEventHandler() is a method that you can use to
add event handlers to elements, and works in a similar way to the
onclick property. However, addEventHandler() isn’t
supported on Internet Explorer, while the onclick property
works
on all modern browsers. Need we say more?
By the way, the property is “onclick”, not “onClick”. If you use
anything but lowercase letters, you’ll get an error, so use only
lowercase when you’re typing event handler properties like this.
We need to make sure that these event handlers are set up as soon as the page
loads. Fortunately for us, the <body> element has an event handler called
onLoad(). We can use that to run a JavaScript function any time the page ...