MooTools Event Delegation
One feature I heard Moo developers hinting at was the future addition of event delegation to the MooTools JavaScript library. MooTools Core Developer, Aaron Newton, wrote a post today about a plugin he's created that does just that.
From the article:
Event delegation is a common practice where by you attach an event listener to a parent object to monitor its children rather than attach events to all the children. It's far more efficient when you have numerous items on a page that you want to interact with.
I don't know of any concrete plans to incorporate this functionality into MooTools 1.3 but I assume they will. I strongly suggest MooTools developers read Aaron's article at Clientcide. I also recommend this article for jQuery users as John Resig recently boasted of this addition to jQuery.
Exciting times in the framework world!
![5 Ways that CSS and JavaScript Interact That You May Not Know About]()
CSS and JavaScript: the lines seemingly get blurred by each browser release. They have always done a very different job but in the end they are both front-end technologies so they need do need to work closely. We have our .js files and our .css, but...
![An Interview with Eric Meyer]()
Your early CSS books were instrumental in pushing my love for front end technologies. What was it about CSS that you fell in love with and drove you to write about it?
At first blush, it was the simplicity of it as compared to the table-and-spacer...
![Page Visibility API]()
One event that's always been lacking within the document is a signal for when the user is looking at a given tab, or another tab. When does the user switch off our site to look at something else? When do they come back?
![Flext: MooTools Auto-Growing Textrea Plugin]()
A while back David Walsh published a list of
7 MooTools Plugins You Should Use on Every Website
which included 'AutoGrow' a text area expander plugin. 'AutoGrow' is very similar in results to the class I wrote for Education.com, Flext. I decided to release this...
John Resig, boasting!? GASP!
Thanks for the news David! … I’ve never been a fan of delegated events/event handlers – do they even bubble/propogate?
Let me add that event delegation is awesome when you’re continually adding DOM elements, perhaps via Ajax… I’m just not sure the performance benefits are as they seem.
@James: I didn’t mean “boasted” in a bad way. It’s an awesome addition which should be boasted. You can find the answer to your question here:
http://groups.google.com/group/mootools-users/browse_thread/thread/bbaf247948273868/db6a33205b71c89b?show_docid=db6a33205b71c89b
James, believe me with even a couple hundred elements you can see a big difference. It takes a few more elements to make a browser like Chrome slow up, but IE folks will see the difference on smaller numbers of events like night and day.