Change Settings for Model Form in Django projekt

I want to have some select fields in Django with relations. What i mean: if i selected Country, in Select "Region" should be a regions from Country. I have many fields, and i want define diese "dependencies" in form settings, like dependencies = {'country':(region, area, appellation), 'type':(character,), 'region' : (area, appellation),} After that i need a procedure, wich make a dependencies in form. and i want to have a javascript, wich load "onchange parent" a new data in "child" Select. It should bi a secure load, for example CSRF protected. Please, It should be only a Django possibilities, not additional mods. of course, javascript should be created. What i need: django form settings code. java data load script protected data responce code.