[HTML] Custom Parsing of Action Objects

Problem

There is no way to custom parse actions similar to how it is possible to custom parse elements.

Design

Have a global and per-card action parsing eventHandler(like other events)

export class AdaptiveCard {
    ...
    static onParseAction: (action: Action, json: any) => void = null;
    onParseAction: (action: Action, json: any) => void = null;
    ...
}

[dclaux]

@ignacionr Action.Submit, at least as loosely defined as it is defined right now, actually doesn’t suit the needs of some clients. Bots have an implicit underlying communication channel over which all messages between the client and the “server” (the Bot) can be sent and received. Outlook, for one, doesn’t have that. Outlook does have its implicit communication channel with Exchange, but Exchange isn’t the third party service that needs to be reached when an action is executed. Outlook wanted/needed another type of more explicit action model, and that model the Action.Http action type. More info here: https://docs.microsoft.com/en-us/outlook/actionable-messages/adaptive-card#actionhttp

While it is true that technically each host can document that the data property of an Action.Submit is to be formatted this way or that way, it remains a not-well-defined property bag and Outlook favored a more strongly-typed approach.

All that said, the action model is unrelated to this change which is only about visuals.

[dptejas]

In outlook actionable message, developer can mark an action as “primary” so that it can get a different visual treatment. Since “primary” is not a open schema for adaptiveCards , in outlook we need support to parse actions custom similar to custom parse elements. Let me know if you need more information on the same