I figured out the optional part (RTFM to myself)
<param name="factorSheet" type="data" label="Factor Sheet" help="Select a
factor sheet (if any)." optional="true" />
On Fri, Aug 5, 2016 at 6:54 PM, Ryan G <ngsbioinformat...@gmail.com> wrote:
> Hi all - I have a custom tool that can optionally take a file as input.
> Right now, users have to upload the file into their history, then select
> the file when running the tool.
> Is there a way to let the user select a file local on their computer as
> input to the tool, then when run, the file is uploaded?
> And (second question), how can I make this field optional, such that the
> user does not need to provide a file at all when running the tool?
> Right now, my input field is:
> <param name="factorSheet" type="data" label="Factor Sheet" help="Select a
> factor sheet (if any)." />
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