https://docs.djangoproject.com/en/1.10/ref/contrib/admin/javascript/ https://docs.djangoproject.com/en/1.10/ref/contrib/admin/#modeladmin-asset-definitions

admin.py

from django.contrib import admin
from django.conf import settings
from .models import Location

class LocationAdmin(admin.ModelAdmin):
    class Media:
        css = {
            'all': ('app/css/geocoder.css',)
        }
        js = (
            'app/js/map.js', '//maps.googleapis.com/maps/api/js?key=' + settings.API_KEY_GOOGLEMAPS + '&libraries=places&callback=initMap'
        )
        
admin.site.register(Location, LocationAdmin)