This can be done in validate(), see 
http://wiki.g2.bx.psu.edu/Admin/Tools/Custom%20Code

Alex

From: galaxy-dev-boun...@lists.bx.psu.edu 
[mailto:galaxy-dev-boun...@lists.bx.psu.edu] On Behalf Of Lukasse, Pieter
Sent: Tuesday, 23 October 2012 9:05 PM
To: galaxy-dev@lists.bx.psu.edu
Subject: [galaxy-dev] Validation / validator questions

Hi,

Is it possible to do validation of input fields depending on the value of OTHER 
input fields?

Example 1

If field A is filled, then field B also should be filled.

Example 2

Field B should be > field A

etc

Pieter Lukasse
Wageningen UR, Plant Research International
Departments of Bioscience and Bioinformatics
Wageningen Campus, Building 107, Droevendaalsesteeg 1, 6708 PB,
Wageningen, the Netherlands
+31-317480891; skype: pieter.lukasse.wur
http://www.pri.wur.nl<http://www.pri.wur.nl/>

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