Note
Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.
After a visitor submits a form, you can redirect them to a _Thank you_ page using the **Display page after submission** field. You can have several forms go to the same _Thank you_ page, so the following elements (in the redirect URL) let you know which form the visitor submitted using the `DefaultAppendExtraInfoToRedirection` class.
`
FormGuid` – Unique ID of the `FormContainerBlock`. Use this ID to lookup the form instance.`
FormLanguage` – Language of the container page (where `FormContainerBlock` is dropped).`
FormSubmissionId` – Unique ID of the submission. Use this ID to lookup the recent submission (which drives a visitor to the _Thank you_ page).
_Forms.Core_ provides the `IAppendExtraInfoToRedirection` interface, and lets you customize the _Thank you_ page. Basically, you should:
Implement the interface.
Make an `
InitializationModule`, and use Dependency Injection to replace the default implementation.
A third-party developer can alter this behavior by implementing `IAppendExtraInfoToRedirection`, and using [StructureMap in InitializationModule (D](🔗)[emoInitializationModule.cs](🔗)) to replace the default implementation:
See also the source code in [Demo project on Episerver GitHub](🔗), especially the following code samples:
[AppendInfoToRedirection.cs in the open-sourced Demo project](🔗)
[DemoInitializationModule.cs in the open-sourced Demo project](🔗)