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Note

Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.

From version 4.18.0, Optimizely Forms can support multiple external systems. Editors can choose one of the registered systems as connected data source in the user interface.

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To make Optimizely Forms support multiple Marketing Automation connectors:

  1. Create an instance of `IExternalSystem` and register this with Forms.

    
  2. Forms automatically activates `ExternalSystem` with the default constructor and registers this with Forms. You can override this default behavior.

  3. Allow the display name of the `ExternalSystem` by ID. You can get the `DisplayName` localization resource from the XML path:

    

    If that resource does not exist, fallback to the default one (like previous versions):

    

## API changes from version 4.18.0

  1. A new service, `ExternalSystemService`, is introduced for working with external systems:

    • `WorkingExternalSystem` – Property to get all currently activated external systems.

    • `HasExternalSystems()` – Determine there is any an implement of `IExternalSystem`.

    • `ActivateFromTypes()` – Automatically try to create instances of `IExternalSystem` by scanning the assembly. This requires the default constructor of the `ExternalSystem`. If you do not want to automatically activate your `ExternalSystem`, override this method and do nothing or do not provide the default constructor for the `ExternalSystem`.

    • `RegisterExternalSystem` – Explicitly register an `ExternalSystem`. Each `ExernalSystem` must have a unique ID. The ID should not contain spaces or special characters.

    • `UnregisterExternalSystem` – Remove an `ExternalSystem`.

    • `GetExternalSystem` – Return instance of an `ExternalSystem` by ID.

    • `GetAllExternalSystems` – Return all instances of `ExternalSystem` (activated, registered)

  2. The property `IPostSubmissionActor.ActiveExternalFieldMappingTable` has been obsoleted since the Actors should not know about the mappings. If you want to have a mapping table in Actors, you can use `IExternalFieldMappingService.GetActiveFieldMappingTables` to retrieve them.