Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.
## Optimizely Forms actors
After a visitor submits a form, Forms.Core calls Actors to perform additional processing on the server.
You can extend and plug in the Actor, and a third-party developer can implement it.
You can run Actors in a sync or async manner.
Each actor is provided with several data, including `
SubmissionData` and the `
Sync-actor can have (and can modify) the `
HttpResponse`, so Actor can modify response and cookie before sending back result to a visitor's browser.
By default, Optimizely Forms has two built-in Actors:
### Handle submission actor's result
From version 4.16.0, it is possible to allow actors to:
Return a signal to cancel a form submission in the case where an actor fails.
Return an error message to be displayed to visitors.
To be able to cancel form submissions and to display error messages, you need to implement the following changes:
Actors must implement `
ISyncOrderedSubmissionActor`. Actors implementing this interface run synchronously in ascending order, regardless of the `
IsSyncedWithSubmissionProcess` value. (Actors are forced to run synchronously because we cannot control the result of async actors).
Actors must return an object instance of a class which implements `
EPiServer.Forms.Core.PostSubmissionActor.Internal.ISubmissionActorResult`. By implementing this interface, the returned result will have two properties: - `
CancelSubmit` (boolean): determines whether the form submission should be canceled or not. - `
ErrorMessage` (string): this error message will be displayed to visitors.
## Implement customized actors
Basically, third-party developer can implement his own Actor by:
Inheriting a `
PostSubmissionActorBase` base class.
Starting from scratch with the `
IPostSubmissionActor` interface and interface `
IUIPropertyCustomCollection` for edit view user interface of configuring the Actor model.
See a code sample about implementing a new Actor in the open-source project on [GitHub](🔗).