You're not missing anything; using validators is the right way for checking parameter values. However, the page refreshes + validation errors is certainly less than ideal for usability. We're in the process of transitioning tool forms to a JavaScript-based framework so that full page refreshes (and associated validation checks) are no longer necessary. J. On Sep 11, 2013, at 4:26 AM, Kahlke Tim wrote:

Hi

I'm using the <validator> tag for simple sanity checks of a tool input. But I realized that any conditional in the form will automatically call refresh_on_change which also validates all fields and prints errror messages.

So questioin: is there a more galaxy-like way of checking input parameters? I am aware of the possibility to do sanity checks through custom code (http://wiki.galaxyproject.org/Admin/Tools/Custom%20Code) but the page states it should only be done if there is no other way.

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