dynamically set options for a dropdown menu

[Thomas Friedrichsmeier]

Hi!

On Thu, 11 Oct 2018 11:39:02 +0200
meik michalke <meik.michalke at uni-duesseldorf.de> wrote:
> Am Donnerstag, 11. Oktober 2018, 07:17:11 CEST schrieb Thomas
> Friedrichsmeier:
> > On Wed, 10 Oct 2018 21:46:26 +0200
> > meik michalke <meik.michalke at uni-duesseldorf.de> wrote:  
> > > so, could the above call somehow be used to dynamically
> > > fill a dropdown menu in a plugin dialog?  
> > 
> > this is not currently possible for a dropdown, but you can set the
> > options of a <select> element, dynamically (property "available").
> > 
> > Of course that feature would make sense for a dropdown just as much,
> > but the implementation of that is quite different.  
> 
> i see. but select can't be limited to single selections, right?

True, but this will be easy to add. Hang on...

> as you've seen, i've added a small function called
> rk.check_for_pandoc() to the rkward R package, which checks the
> system for a pandoc installation and provides some information on
> supported formats.
> 
> i think it should either added somewhere to RKWard's startup routine
> and its findings  appended to the global .Options, and/or included in
> rk.sessionInfo() (for debugging).
> 
> can plugins access the global .Options? if not, at the very least a
> sanity check can now be added to the R code to be run, so if the user
> tries to submit something that is not supported by his/her system
> setup, a proper error message is returned.

See plugins/data/level_select.xml for an example of how to query R for
information from inside a plugin dialog (also somewhere in the docs, of
course, but going by example will be easiest).

Regards
Thomas
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