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Jack Rose 1Jack Rose 1 

Making data categories in Search Narrow mandatory on PKB

Hi All, 

Hoping I can get some help with an issue I'm facing. I'm an admin but trying to learn some code. 
Our business requires the data categories surfaced on the PKB under the Search Narrow section to be mandatory before a user can search for an article. 

I had been told that the required="True" attribute needed to be added to the Outputpanel for each of the categories in the pkb_narrow VF page. However when saving I recieve an error stating that required is an unsupported attribute. 

Any suggestions would be much appreciated.
Thanks in advance