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Visualforce relates to questions where the Visualforce language or framework are concerned. This is primarily VF pages, components, PDF rendering, and email templates. This would only cross-over to Lightning where Lightning Out (Lightning for VF) or VF pages using SLDS or being used in LEX. Where a question relates to Apex invoked as part of a VF page, this tag would also be appropriate.
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How to make a dynamic picklist field as required in vf?
I am creating a popup which shows some product details along with dynamic contact list.how to make this dynamic picklist as required or through an error when if its not selected or the value is "--sel …