Which Ajax library do you use/recommend?

[Zanicar]

I will also throw my weight in behind jquery... Just rewritten part of a system we are developing to use jquery cause it cuts down on developing our own libraries. Nice feature I like with jquery is that you can have AJAX return XML, plain text, JavaScript Objects and even pure javascript scriplets that are executed on a successful callback!

[DigitalRealm]

If you are using Rails, then the clear choice would be prototype/scriptaculous. Otherwise, I think you would need to determine what exactly it is that you will be using the library for, and then decide which is the best way to go.

One thing I feel should be mentioned.....DO NOT let a JS library get in the way of learning JS first. You should really learn JS before you depend on a library for development work. This will save you lots of headaches and time later on.

[Para]

http://mootools.net/ is excellent!

[Contrid]

http://mootools.net/ is excellent!

This looks great!
One thing I truly like about it is the forums.
jQuery needs one of those. I cannot stand mailing lists.

All of these libraries seem to have very unique features and advantages.
I'm thinking of giving MooTools a go on a project I'm currently working on.
Have been experimenting with jQuery and really like it though.

[Dark Tranquility]

I use mainly prototype, but I also use jQuery and dojo from time to time

[dimitry_z]

+1 mootools
+1 YUI

The former is great on sites that require the occasional AJAX based form elements; an AHAH widget; or those nifty functions that often require some coding (Cookies, anyone?). Simple, lightweight, and well documented.

YUI, on the other hand, is for those who enjoy Java. It's heavy, complex, and offers options for everything. The provided libraries cover most of what is needed for developing rich web applications. For those additional features, a simple object-oriented approach does the job.

Finally, make sure that whatever lib you choose, you get AJAX file uploads (if you need it, of course). I had trouble with prototype 1.4 on this one. If there is an extension, I don't know about it, but YUI does it.

[spinmaster]

I like jQuery...

[Contrid]

I only saw this today...but Opera also has their own JavaScript libraries.

http://dev.opera.com/libraries/

[JohnShaft]

Another vote for jQuery.

I have almost zero Javascript knowledge. And had spent many hours trying to get an EditInPlace type thing running by following examples from pages (which used diffferent AJAX libraries).

It wasn't until I found one that used jQuery (jEditable) that I finally started to get something together because I could follow the small code.

So definitely jQuery++;

[Dark Tranquility]

http://mootools.net/ is excellent!

I've looked at it and it looks nice too

[Contrid]

Have been spending some time with Scriptaculous and Prototype over the past day or so. It really is great. There are some features I missed from the jQuery library, but the effects and selectors that Scriptculous provides is great. Might give Mootools a try on a new project sometime.