Hi Peter,

     I am afraid that the link you gave me could not solve the problem. The 
question I asked is about the help element, not the label attribute for data 
     To clarify my question, here is the code which does not work, but shows 
what I intend to do:
<conditional name="blast">
        <param name="type" type="select" label="BLAST type">
                <option value="blastn">BLASTN</option>
                <option value="blastp">BLASTP</option>
        <when value="blastn">
                <help>BLAST DNA against DNA</help>
        <when value="blastp">
                <help>BLAST protein against protein</help>
      I tried to set the help content according to the selected type, which 
works like a section header to the following param list.
      Obviously this does not work. Then I tried a less-fancy way by providing 
static help context by adding <help> under select param like
        <param name="type" type="select" label="BLAST type">
                <help>BLASTN: BLAST DNA against DNA, BLASTP: BLAST protein 
against protein</help>
                <option value="blastn">BLASTN</option>
      Of course it works but in an ugly formatting text. Is there any document 
to format it nicely, e.g. a list?

Best regards!

-----Original Message-----
From: Peter Cock [mailto:p.j.a.c...@googlemail.com] 
Sent: Tuesday, May 27, 2014 4:40 PM
To: Jun Fan
Cc: galaxy-dev@lists.bx.psu.edu
Subject: Re: [galaxy-dev] complex help for conditional param

On Tue, May 27, 2014 at 4:32 PM, Jun Fan <j....@qmul.ac.uk> wrote:
> Hi all,
>        In the conditional param, when sub-element allows you to write 
> specific parameters for a particular value selected. I am wondering 
> how to write the help context according to the value selection. For 
> example, if there is a conditional param called blast_type, when 
> “blastn” is selected, the help context will be “blast dna against dna” 
> and when “blastp” is selected, the help context will be “blast protein 
> against protein”.
> Basically this selection-based help text provides a general 
> description of the selection, which could help to set up the corresponding 
> parameters.
>       By the way, is there any document about formatting text in the 
> help element?
> Best regards!
> Jun

You can do this kind of thing with one-line Cheetah syntax within the output 
XML tag, but it quickly gets very complicated. e.g.



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