The Hitchhikers Guide to client Side Persistent Storage
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This document summarizes options for client-side persistent storage on mobile web. Local storage using localStorage has broad support and is recommended. Other options like cookies have size limits, and SQLite requires a SQL API. IndexedDB and the File API are not fully supported. Storage needs vary by platform - iOS and Android have different limits. Frameworks can provide a common API across storage mechanisms. Performance of localStorage is fast for reading and writing. Security considerations apply depending on the storage mechanism used. Overall, client-side storage options are improving and localStorage is generally sufficient.
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The Hitchhikers Guide to client Side Persistent Storage
- 1. The hitchiker‘s guide to... storage! Jens Arps uxebu
- 3. We open the mobile web.
- 5. So why?
- 6. Walkthrough
- 7. Cookies • Pros: • huh... • Cons: • low size limit • sent w/ every request • no API
- 8. userData • Pros: • available in old IEs (5.5 up) • nice API • Cons: • low size, unreliable • IE only http://msdn.microsoft.com/en-us/library/ms531424%28v=VS.85%29.aspx
- 9. globalStorage • Pros: • nice API • still in FF • Cons: • FF only
- 10. Sqlite • Pros: • broad support • good size • Cons: • no k/v store • no spec
- 11. Sqlite • reads fast, writes slow • chrome has a limit on field size (~2.3MB) • no spec on available SQL commands • use variable binding • may fail silently • check for worker support!
- 12. Sqlite Size Limits Safari Chrome Opera User confirm if User confirm if requested more than requested more than 5MB, but unlimited. 4MB, but unlimited. 5MB, fails silently if If needed more than If needed more than attempted to store initially requested, initially requested, more. user will be asked user will be asked again. (Stopped again. (Stopped testing at 1.5GB of testing at 1GB of data.) data.)
- 13. localStorage • Pros: • broad support (Safari, FF, Opera, IE) • perfect API • Cons: • none
- 14. localStorage Size Limits Wait for QUOTA_EXCEEDED_ERROR.
- 15. localStorage Size Limits Safari FF IE Opera 5MB 4MB - 2MB 5MB (200MB) unlimited
- 16. localStorage The Storage Event Safari 5 Chrome 6 IE 8 **) Firefox 3 Opera 10 key yes yes undefined undefined yes oldValue yes yes undefined undefined yes newValue yes yes undefined undefined yes url yes undefined yes undefined yes storageArea yes yes undefined undefined yes x-window *) *) yes yes yes fires on setItem only on changed values only on changed values only on changed values always only on changed values fires on removeItem only on changed values only on changed values only on changed values only on changed values only on changed values fires on clear only if not empty only if not empty always always only if not empty sth else? nope - uri property nope - domain property nope
- 17. IndexedDB • Pros: • can store objects • Cons: • not really there yet
- 18. File API • Pros: • we‘ll see • Cons: • we‘ll see
- 19. plugin based • Flash • Gears • AIR •…
- 20. What engine for my project?
- 21. multi-engine 1. localStorage 2. globalStorage 3. Sqlite 4. plugin based 5. userData 6. cookies
- 22. Frameworks!
- 23. standalone - Lawnchair - persistJS -… part of library - dojox.storage - YUI -…
- 24. Mobile!
- 25. got WebKit? iOS : Sqlite iOS 3+ : localStorage Android 2+ : localStorage & Sqlite bada: localStorage & Sqlite webOS 1.4.5 : localStorage
- 26. Size Limits localStorage: On Android 2.2, iOS 4 and bada limited to 2MB. Sqlite: iOS asks user at 5MB, Android just keeps on storing. On Android 2.1 localStorage seems to be able to store more than 2MB.
- 27. got widget NS? widget preference store http://dev.opera.com/articles/view/opera-widgets-preference-store/
- 28. got app? - sqlite w/ phonegap @ Android < 2 - cookie size oddities - more options might be available (Gears, FS, Couch, …)
- 29. Frameworks?
- 30. StorageJS „The missing micro wrapper“ • targeted at embedded devices • uses the EmbedJS approach
- 31. Performance
- 33. Security
- 34. Summary It‘s not as complicated as it sounds. And it‘s getting better.
- 35. Thanks! Jens Arps @jensarps http://jensarps.de @uxebu http://uxebu.com