Hi Nicola,

Thank you. I tried the validator as you illustrated, and it worked

Ravi Sanka
ICS ­ Sr. Bioinformatics Engineer
J. Craig Venter Institute

On 4/9/14 11:06 AM, "Nicola Soranzo" <sora...@crs4.it> wrote:

>Il 2014-04-09 17:00 Sanka, Ravi ha scritto:
>> Greetings,
>> I am adding a new tool to our in-house Galaxy, which has a few string
>> inputs. I have made each one a text param in the XML, but want to
>> ensure that the user does not leave any empty when he executes the
>> tool.
>> How can I do this? I tried setting the optional field of each text
>> param to false, but that doesn't work since, technically, an empty
>> string still counts as a string.
>> Is there a minimum length setting I can enforce?
>Hi Ravi,
>you should use a validator, as in the following example:
><param name="rgid" type="text" label="Read group identifier (ID)">
>     <validator type="empty_field" />

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