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PWA in Practice

PWA in Practice

Kinds of PWA and personal PWA Projects by Frank Jogeleit.


January 16, 2020

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  1. Who am I Frank Jogeleit @move:elevator GmbH
 Backend Engineer GitHub:

 Twitter: @FrankJogeleit
  2. Agenda • Kinds of PWA • Personal PWA Projects •

    The good • The bad • The ugly • Learnings This talk is about …
  3. The understanding of PWA’s There are many different types, requirements

    and implementations of Progressive Web Apps • Content based communication Apps like Twitter concentrate on performance und features like Web Share. Offline first is not a really requirement and so you can’t really use it without an active connection • Tools with a focused functionality have no need for a constant connection and can offline first without any downfalls like https://squoosh.app It depends …
  4. The understanding of PWA’s The most projects I know are

    in between. It depends on functionality and sometimes on a specific feature. • When we decide to go with an PWA? • Device Support (iOS, Android, Desktop, Browser?) • User Environment (stable connectivity) • Featureset / Applikation / Context • Deadlines / Timeline / Developers • Deployments / Updates It depends …
  5. What we have made as PWA • Digitale Leader recording

    with dynamic surveys • Appointment Management • Information material: PDF, Images, Video • Multimedia Notes: Audio, Text, Drawings, Images • Teamchat • Statistical Evaluation • Follow Up tools Speedlead
  6. Speedlead • Easy Setup per Customer • Wide device and

    browser support • Core features have complete offline support • create / update / delete reports and notes • open information material • Update is an simple website deployment without additional user actions • Customizable layout The good parts
  7. Speedlead • Speedlead development starts in early 2017, at this

    time there was no ServiceWorker support for Safari • No cache and fetch API for offline support • Not installable on iOS • No Camera / Audio access on installed iOS Versions • No background sync API The bad parts
  8. Speedlead • Complex implementation for Safari Browser support • Offline

    support with RxJS middleware to execute different actions on request failures • Persist failed requests for a later synchronization • Switch in offline mode by request timeouts • Persist files in indexedDB for offline access • Retry logic by expired authorization • LocalStorage as simple persistent redux solution The ugly parts
  9. Speedlead • windows.onLine API works different for Safari, it also

    return true if you are in a network (LAN) without Internet connection. So wie also use requests timeouts as indicator for offline mode • We replaced the indexedDB storage for files with the cache API after Safari also started to support it. • indexedDB loads the complete resource before it returns the file, so it can block your UI with large files • Cache API streams responses which leads to a better performance Learnings