List filters Customization

In the lead list page, there are a section filed which show all lead by category. Screenshot:-

but i have to update it as well when user apply any filter. For eg if user apply filter “Assigned to” => “Sales person name” then this list needs to updated also.
How can i obtain this.
I have created custom app and js file. But after that how can i reload the status section when any filter applied.

Also can you please refer me a tutorial when i can read js events like “when filters get applied on list”