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Scenario: I have Tasks list with a (lookup) column Project. I have also a multivalue lookup column Predecessors pointing to the Tasks list itself.
Question: Is it possible to filter available Tasks based on the Project column value to show only the Task having same project? Is it possible to get it done without coding?
You will need to populate a drop-down fetching projects from the Projects list and than on selection redirect to the same page with ProjectId (ID) in the Query String..
Use List View Web Part to get the ProjectId from the Query String (as Query String Parameter) and filter the tasks list.
Following blog post should help (It is using External List so ignore the External Content Type and Filters etc.) but configuring the List View Web Part and JavaScript to redirect with Query String will help
I might be totally missing the point of your question, but it looks like a plain filtered, no-code view filtered by lookup column would solve your problem.
When browsing the Task list, create a new view. In view settings scroll down to filter area. Select your lookup column from the dropdown list and entered desired filtering value.
