ExtJS is not part of Pyjamas or GWT.  It is a very advanced and
powerful toolkit but doesn't compare well with jQuery (which is just a
library).  They serve different purposes.  jQuery is for websites
while ExtJS is for web-applications.  There is some overlap, but most
people don't need or want a layout manager or datagrid on their blog.

With regard to GWT, there is a ExtGWT which is a GWT-like
implementation of ExtJS.  Basically you do all your ExtJS programming
in Java.  There is nothing like this for Python at present.  (Pyjamas
sort of fills this niche, but it doesn't use ExtJS.)

As far as money, the company behind ExtJS is shady on licensing.  The
clear cut stuff is this:
1) If your project is under an approved Open Source License, then you
may use ExtJS for free under the GPLv3 license
2) If your project is not under an approved open source license, then
they require that you purchase a developers license
3) If 2 is true and you wish to bundle ExtJS with your product such
that the users of your product will be developers using ExtJS, they
require an OEM license.

Massimo, I'm interested to hear how things go.

-tim

On Nov 30, 9:34 am, Thadeus Burgess <thade...@thadeusb.com> wrote:
> ext js is nice, however their more advanced features cost money? I like
> jquery because there is a plug-in for almost everything, and its so easy to
> perform plug-in development, I was able to create a couple of jquery plugins
> and I have absolutely no javascript experience :)
>
> Though the money factor is the only reason I have never tried using ext
> js... and the fact that google/gmail uses jquery.
>
> -Thadeus
>
> On Mon, Nov 30, 2009 at 8:23 AM, mdipierro <mdipie...@cs.depaul.edu> wrote:
> > I am going to a talk on Django and extjs next week. I will report
> > back.
>
> > Massimo
>
> > On Nov 30, 6:17 am, davidjensen <davidjensen...@gmail.com> wrote:
> > > Hi everyone,
>
> > > I have seen mention many times on this group of jquery. However, ext
> > > js looks very powerful and there are lots of books on it. What do you
> > > think of ext js. Apparently, it has a connection with gwt. Is it part
> > > of pyjamas?
>
> > > Thanks
>
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