Front end shopping cart implementation

[ivansg44]

I have implemented front-end functionality for the shopping cart. Here is the main flow of things:

• geem_cart.js

  • Clicking #updatePackageButton retrieves @context and specifications of items in shopping cart via get_cart_items_context and get_cart_items_specifications, which are then added to the user-selected draft package via add_context_to_package and add_specifications_to_package

  • get_cart_items_context, get_cart_items_specifications, add_context_to_package and add_specifications_to_package call functions in geem_api.js

• geem_api.js

  • Direct calls from the browser to the server

  • get_resource_context

    • Calls ResourceViewSet.context

    • Called by geem_cart.get_cart_items_context

  • get_resource_specifications

    • Calls ResourceViewSet.specifications

    • Called by geem_cart.get_cart_items_specifications

  • add_to_resource_context

    • Calls ResourceViewSet.create_context

    • Called by geem_cart.add_context_to_package

  • add_to_resource_specifications

    • Calls ResourceViewSet.create_specifications

    • Called by geem_cart.add_specifications_to_package

[ivansg44]

@ddooley