Hi Peter,

I have opened a ticket for this UI-form enhancement request. Status can be tracked at:

Thanks for the suggestion!

Galaxy team

On 8/4/11 8:20 AM, Peter Cock wrote:
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?


Jennifer Jackson
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