The Facebook app team shares tips and tricks directly from the Facebook playbook that will help make your own webOS apps easier to create and maintain. Get the inside scoop on techniques they developed for debugging, data management, and common webOS tasks. Open source included.

2. Adventures in Facebook®:Lessons Learned from a Landmark webOS App Kevin Decker Developer Relations Engineer April 24, 2010

3. Best Practices Debugging Tools Classes and Libraries Open Source Agenda

4. Best Practices

7. Widgets—Advanced Subwidgets controller.instantiateChildWidgets(controller.element) controller.exposeMethod Mojo.Event.send

8. Avoid Document References Multiple stage = multiple documents Execution occurs in data document Consequences: References to document object will fail document.getElementById document.querySelector Mojo.Controller.stageController Prototype extensions may fail Multiple stage readiness

9. Avoid Document References Fixes: document.getElementById sceneController.get document.querySelector sceneController.sceneElement.querySelector Mojo.Controller.stageController sceneController.stageController Mojo.appController.getActiveStageController $(elId).x() Form/Element.x(sceneController.get(elId)) Multiple stage readiness

10. Periodic Tasks Two methods: palm://com.palm.power/timeout service setInterval Limited to app lifetime: setInterval Outliving app: Timeout service

11. Debugging

12. Inspecting Multistage Applications Process/document under Multistage Data document Stage documents applicationManager service bit.ly/aQFnuF stage-inspect script github.com/kpdecker/stage-inspect

13. Logging Error.prototype.toString Function wrappers wrapInLogger wrapInErrorHandler DebugLogging.wrapInErrorHandler( "Mojo.Controller.SceneController”, [ "assistantSetup", "assistantCleanup" ]); traceWrapper Exceptions are not logged in API callbacks DEBUGGING ONLY

14. Tools

15. Tools palm-run Build+execution utility Build Deploy Launch Log github.com/dalmaer/palm-run i18nScanner Scans for untranslated JavaScript and HTML strings Generates report of i18n tokens github.com/kpdecker/i18nScanner

16. Classes and Libraries

18. queue

19. getSuccessHandler

20. getErrorHandlerLogin Status Notify

22. setup

23. cleanup

24. observe

26. request

27. Same signature as Mojo.Service.Request

28. Maintains references

29. Cancels completed requests

31. Depot wrapper

32. Simplifies init, access, and expiration

33. load

35. getRange

36. Look ahead algorithm

37. refresh

38. Subclasses:

39. loadRange

41. Open Sourced All of the libraries open sourced github.com/palm/webos-samples Further details (to come) incaseofstairs.com