I'm still expanding my understanding on the use of jQuery, but every day I feel happier about it and see what such an amazing tool it is to extend APEX applications.
I little example today was to create a dynamic action that fires every time a checkbox on my page is changed. I wanted to do this to show a warning if no checkboxes were ticked, and I didn't want to hardcode checkbox names - so the ideal solution is to use the jQuery Selector selection type.
By using the syntax
this dynamic action will fire as required. Further information this selector (and others) can be found in the jQuery documentation. They main thing to note for APEX is that surrounding
$()is not required in this context - otherwise you receive the error
Uncaught Syntax error, unrecognized expression: $('input:checkbox')
And as a starting point if you're unfamiliar with jQuery, check out the FAQ.
I also picked up this handy e-book for $5 during an O'Reilly promotion: jQuery Pocket Reference