Hi Linda,

I think your parameter definition will need to send the file_name of the 
HistoryDatasetAssociation, something like this...

<param name="samples" type="select" refresh_on_change="true" 
display="checkboxes" multiple="true" label="Mark quality control samples" 
dynamic_options='get_column_names(amplitudes.file_name)’/>

...and then your get_column_names() method should open the file to read the 
headers.

Let us know if this doesn’t work.

Greg Von Kuster

> On Sep 22, 2015, at 7:45 AM, Linda Bakker <linda.bak...@wur.nl> wrote:
> 
> Hi All,
> 
> I am a bit lost here.
> 
> In my xml I have the following sections:
> 
> <inputs>
>    <param type="data" format="tabular" name="amplitudes" label="amplitude 
> file"/>
>    <param name="samples" type="select" refresh_on_change="true" 
> display="checkboxes" multiple="true" label="Mark quality control samples" 
> dynamic_options='get_column_names(amplitudes)'/>
> </inputs>
> 
> <code file="dynamic_options.py" />
> 
> In my dynamic_options.py script, I want to parse the headers from 
> 'amplitudes' file and show them in the checkboxes section.
> 
> My problem seems to be the following.
> 
> In python, amplitudes is a galaxy object:
> <galaxy.model.HistoryDatasetAssociation object at 0x7f4fc020a210>
> 
> How do I parse/access this file to get the headers?
> 
> It seems to be partly the same problem as asked last week in this 
> conversation:
> http://dev.list.galaxyproject.org/Question-about-using-dynamic-options-and-refresh-on-change-for-rendering-2-associated-select-lists-td4667943.html
>  
> 
> Thanks!
> Linda
> 
> -- 
> Linda Bakker
> Bioinformatics Research Assistant
> Plant Research International, Wageningen UR
> Building 107 (Radix), room W1.Fa.054
> Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
> tel: +31-317-480756
> email: linda.bak...@wur.nl
> 
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