On Thu, Aug 4, 2011 at 3:42 PM, Peter Cock <p.j.a.c...@googlemail.com> wrote:
> Dear all,
>
> I'm trying to define an *optional* column parameter as follows:
>
> <param name="start_col" type="data_column" data_ref="input_tabular"
> multiple="False" numerical="False" optional="True"
> label="Column containing start co-ordindate"
> help="Leave empty to include everything from the first base/residue"/>
>
> i.e. I want the user to either select ONE of the columns of the input
> tabular data file (in which case getting "1" or "c1" etc as the string
> is fine) OR pick no column at all (in which case I want an empty
> string or similar in the command string.
>
> Is this possible?
>
> The above parameter loads fine, but defaults to the first column with
> no apparent way to un-make this implicit selection.

I've noticed a potential UI solution and precedent in Galaxy: if you
do "edit attributes" for an "interval" file - here the strand and name
settings combine a checkbox and select box.

Can we have this UI behaviour for a tool XML file parameter as
described above please?

Peter
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