view-perma view conditioning Add button

view-perma view conditioning Add button

Im loading a view via view-perma link w/ url parameters. I also need to limit the Add button to only add records which are preloaded with the url parameters so like records can be created. I tried to interrogate the url parameter via the onAdd/onLoad event but I could not access the views params. How do I modifiy the view's Add button on a view-perma screen? Thanks :)