How to select multiple features and get extent of these features using Django?

[manapshymyr-OB]

Dear all, I am pretty new to the Geonode. I am successfully installed it to the ubuntu using the advanced installation docs. question. 1. How to make available multiple selection of features within a map for clients? 2. How to get extent of those selected features and pass them to the Django for some Geoprocessing in Postgres?