Cascading Drop Down Lists in SharePoint

April 30, 2008

Cascading drop-down lists are a nice trick in a form — where the value from one DDL determines the given values in the next one, which winnow down the next one, and so on. In regular ASP.NET programming you do this by passing the selectedvalue or selectedindex of the first DDL as a parameter to the next DDL.

It’s not too difficult to do this in InfoPath, but we currently have a pretty extensive SharePoint document library project where this would be handy. So putting this feature in place there is on my current task list. As I was trying to gather resources for it, I ran across this helpful post on Datacogs.

Example of a cascading ddl


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