You'll need to use Ajax. Check out this link: 
http://stackoverflow.com/questions/8146260/best-practice-for-populating-dropdown-based-on-other-dropdown-selection-in-web2p/8152910#8152910.

Anthony

On Thursday, November 27, 2014 7:04:28 PM UTC-5, tahnoon pasha wrote:
>
> Hi, 
>
> I saw a discussion begin on this subject on Stackoverflow but can't find 
> the continuation here. 
>
> I have a case where I need to use the input in one form field (eg 
> portfolio) to filter options of  the IS_IN_SET constraint for a subsequent 
> form field (eg sector/industry). 
>
> I'm pretty new to web2py and jquery. How would I go about implementing 
> this? 
>
> Thanks

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