In the shouldShowMessage function of the MessagingDelegate, call public void handleJavascriptMessage(final String name, final AdobeCallback<String> callback) to register your handler.

The name of the message you intend to pass from the JavaScript side should be specified in the first parameter.

The following example shows a handler that dispatches a decisioning.propositionInteract Experience Event natively when the JavaScript of the in-app message posts a myInappCallback message:

Java

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@Override
public boolean shouldShowMessage(FullscreenMessage fullscreenMessage) {
  Message message = (Message) fullscreenMessage.getParent();
  
  // in-line handling of JavaScript calls
  message.handleJavascriptMessage("myInappCallback", new AdobeCallback<String>() {
    @Override
    public void call(String content) {
      System.out.println("JavaScript body passed to native callback: " + content);
      message.track(content, MessagingEdgeEventType.IN_APP_INTERACT);
    }
  });
}
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@Override
public boolean shouldShowMessage(FullscreenMessage fullscreenMessage) {
  Message message = (Message) fullscreenMessage.getParent();
  
  // in-line handling of JavaScript calls
  message.handleJavascriptMessage("myInappCallback", new AdobeCallback<String>() {
    @Override
    public void call(String content) {
      System.out.println("JavaScript body passed to native callback: " + content);
      message.track(content, MessagingEdgeEventType.IN_APP_INTERACT);
    }
  });
}

In the shouldShowMessage function of the MessagingDelegate, call handleJavascriptMessage(_:withHandler) to register your handler.

The name of the message you intend to pass from the JavaScript side should be specified in the first parameter.

The following example shows a handler that dispatches a decisioning.propositionInteract Experience Event natively when the JavaScript of the in-app message posts a myInappCallback message:

Swift

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func shouldShowMessage(message: Showable) -> Bool {    
    let fullscreenMessage = message as? FullscreenMessage
    let message = fullscreenMessage?.parent

    // in-line handling of JavaScript calls
    message?.handleJavascriptMessage("myInappCallback") { content

        print("JavaScript body passed to native callback: \(content ?? "empty")")

        message?.track(content as? String, withEdgeEventType: .inappInteract)
    }

    return true
}
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func shouldShowMessage(message: Showable) -> Bool {    
    let fullscreenMessage = message as? FullscreenMessage
    let message = fullscreenMessage?.parent

    // in-line handling of JavaScript calls
    message?.handleJavascriptMessage("myInappCallback") { content

        print("JavaScript body passed to native callback: \(content ?? "empty")")

        message?.track(content as? String, withEdgeEventType: .inappInteract)
    }

    return true
}