Asynch Client Calls

This component makes use of the asynchronous nature of XMLHttpRequest and abstracts the complexity of handling callbacks from this mechanism into low-code.

The component needs a REST URL that will process the request, and throw an event when ready.

There are two options when processing the event:

• The service invoked either returns a JSON string the the event handler should deserialize and push back to the page (using AJAX refresh for instance)
• The service invoked binds the results to a generated ID aggregating results that can be processed in the event handler (also using AJAX refresh, for instance)

Multiple things can be done to improve the component further:

• Change the ID to a more anonymous GUID
• Implementing retention mechanisms over data that is transiently stored
• Porting back to OutSystems 10 by using Notify / GetNotifyMessage mechanism
• Porting back to OutSystems 9 by using ARDO JSON for JSON based events