how to implement ajax in Code igniter

[eluser]NachoF[/eluser]
[quote author="Bramme" date="1240917955"]A view is in the end nothing more than an echo, only a little more complicated :p

When working with ajax, i tend to go away from mvc and even keep database logic in the controller method... Don't know why, but I like the approach.[/quote]

Well, I have been using datamapper library so even though I dont actually do any query I guess in the background my queries are being done in the controller ... but echoing inside a controller is where I draw the line lol