ProvJS: Six Months of ReactJS and Redux
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What I learned using react.js and redux, six months in. Some tips that you won't find in the simple tutorials around the web.
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ProvJS: Six Months of ReactJS and Redux
- 1. SIX MONTHS OF REACT & REDUX: A REAL WORLD USE CASE Thom Nichols - @thom_nic
- 2. DISCLAIMER: Not an expert I might be doing it wrong
- 3. SO YOU WANT TO TRY REACT + REDUX…
- 4. WHAT ARE YOU (PROBABLY) GOING TO NEED? Webpack Babel + presets React-redux Redux-thunk Redux-logger Axios or fetch-polyfill Immutable.js React Redux Jest or Mocha + JSDOM or Karma + Phantomjs React-router React-router-redux
- 5. ALL YOU NEED IS A FEW PACKAGES FROM NPM
- 6. GREAT! AM I READY TO START PROGRAMMING NOW?
- 7. WHAT ARE YOU (PROBABLY) GOING TO NEED? Webpack Babel + presets React-redux Redux-thunk Redux-logger Axios or fetch-polyfill Immutable.js React Redux Jest or Mocha + JSDOM or Karma + Phantomjs React-router React-router-redux What we actually care about
- 8. WHAT ARE YOU (PROBABLY) GOING TO NEED? Webpack Babel + presets React-redux Redux-thunk Redux-logger Axios or fetch-polyfill Immutable.js React Redux Jest or Mocha + JSDOM or Karma + Phantomjs React-router React-router-redux What we actually care about
- 9. LET’S TALK ABOUT REDUX
- 11. FLUX ARCHITECTURE - SIMPLIFIED
- 12. SHOW ME THE CODE!
- 13. TRIVIAL ACTION EXAMPLE store.dispatch( addTodo(‘call mom’) );
- 15. THINGS NOBODY TOLD ME ABOUT REACT + REDUX
- 16. USE IMMUTABLE.JS RECORDS! Without Records: With Records:
- 18. WHAT SHOULD MY STORES HOLD?
- 19. WHAT DOES MY DATA LOOK LIKE?
- 20. MY STORES HOLD MAPS
- 21. STORES MAY LISTEN TO “OTHER” ACTIONS
- 22. I’M IN UR COMPONENT… CONNECTIN UR PROPS
- 23. ACTIONS + PROMISE CHAINING = AWESOME
- 24. ACTIONS + PROMISE CHAINING = AWESOME
- 25. WHAT’S ANNOYING? Component testing connected components is hard. I rely (mostly) on functional testing Export both a connect()-ed and non-connected component See: Erik Ras’ “ducks”
- 26. WHAT’S ANNOYING? It’s difficult to call a method on a component wrapped as a high-order component…
- 27. DON’T DO IT BUT: you probably shouldn’t be doing that anyway: pass data via callbacks passed from parent component. Or pass data via a redux action
- 28. LET’S RECAP Use ImmutableJS records for domain types in stores Use ImmutableJS Maps often for store data containers Use redux-thunk to make remote requests in actions Async action creators should always return a promise Reducer cases are not always 1-to-1 with actions Let me know if you’ve figured out the component testing issue with connected components… HoC component wrapping cause some pain Webpack is really the most annoying part
- 29. MORE TRICKS
- 30. DEBOUNCE EXPENSIVE ACTIONS Some independent top-level components say what data they want to fetch from `componentWillMount()` Debounce a single remote request
- 31. CONSISTENTLY DISPATCH START & END ACTIONS These are used for loading indicator & error messaging
- 32. BONUS: REDUX-FORM IS AWESOME
- 33. BONUS: REDUX-FORM IS AWESOME
- 34. DECIDE WHAT WORKS FOR YOU Frameworks are less about prescribing “the right way” and more about getting everyone to do things the same way. - @thom_nic
- 35. THANKS
- 36. ACTUALLY…. ASK ME ABOUT DIGITAL ELECTRICITY
- 37. MORE SLIDES
- 38. I DON’T NEED ANGULAR-RESOURCE This is actually (really) boilerplate. Replaced with this:
- 39. WHY I DON’T NEED ANGULAR- RESOURCE … and http thunks of thunks:
- 40. A WORD TO THE WISE… Avoid temptation to do client-side data manipulation to attempt to mirror server state. Better to always fetch from the server as the source of truth
Notes de l'éditeur
- What I’m going to present seems to be working OK for me. It might not work for you. Try it yourself and decide.
- • How many people have written a simple redux app? • How many people have read some tutorials? So you’ve heard redux is pretty rad. Lots of people say it’s cool. Maybe you’ve used Angular or Ember or Backbone and Marionette. Well, react is like that, except….
- Also react-router and redux-simple-router. Also hot module reloading. And the source maps. Never forget the source maps. You might spend a week getting those two things working.
- So before you've started writing any code your package.json is going to look something like this!
- Let's backup for a second. What you *really* care about is actually a small number of packages. These are actually *really* simple to learn. You’ll spend 4 hours learning this, and two weeks getting the tooling to work.
- By the end, you’ll feel like this. So what I'm really saying is, copy someone else's boilerplate example.
- Let’s try to remember what we’re trying to achieve
- You might have seen this before. https://facebook.github.io/flux/docs/overview.html
- Gross oversimplification of redux. Or is it? The view executes actions via the dispatcher. Actions update the store (state) via reducers. The store updates the view via connect() to react props.
- This is what you see… Too simple. How do I make a server request?? Source: https://github.com/reactjs/redux/blob/master/examples/todomvc/actions/index.js
- The key is always return a new object when you manipulate the store. It lets redux optimize react render passes. Source: https://github.com/reactjs/redux/blob/master/examples/todomvc/reducers/todos.js
- Ok so that's what you (probably) already knew about redux.
- If you’re use Python’s record type or Ruby’s struct… it’s just like that. Easy peasy data classes. Immutability is pretty much essential for redux because of how it optimizes updates. Immutable.js is definitely cleaner than using Object.assign and spread/ rest to create new objects. (It’s also faster.)
- If you’re use Python’s record type or Ruby’s struct… it’s just like that. Easy peasy data classes. Immutability is pretty much essential for redux because of how it optimizes updates. Immutable.js is definitely cleaner than using Object.assign and spread/ rest to create new objects. (It’s also faster.)
- Should stores hold a single object? A list if it’s
- I’ve got a list of nested items on the left… So immediately I know I need stores to hold a sequence of items. But also I need to be able to determine relations between items. (Normalizr helps with this.) In addition to the same item appearing both in the list and the main section. Long term you might want something like an LRU to deal with paging and data bloat.
- I need to be able to determine relations between items. (Normalizr helps with this.) I decided stores should be maps of my domain models. They have child/parent ID references so you can lookup corresponding parent children in each store. Long term you might want something like an LRU to deal with paging and data bloat.
- The reason why actions are disconnected from reducers is because they are not always 1-to-1. On line 35 the transmitter (child) reducer is populating the store from children in a fetched parent object.
- Let's look at connecting your store to view components. The connect method of react-redux is awesome. • Components are completely unaware of redux. • Connect() wrapped components have stores (state) and actions injected into props. • This makes un-connected components easily testable. • If you've done Java/Spring this feels like dependency injection
- This is why you need redux-thunk. Basically to do anything async. IDK why it’s not part of redux or react-redux. When you execute your action, return the promise and you can do things like navigation, close a dialog, etc. when the action completes.
- On line 81 I’m calling an action then closing a dialog and navigating to a new page (line 83) when successful. I could also perform specific steps if the action failed (e.g. 409 conflict on the server) If you ask me this is more appropriate place to put this logic than e.g. by getting a result from a store.
- Components wrapped in connect() can’t be searched for by Component name in shallow render tests. :( Erik Ras proposes exposing both a connected and non-connected component. See: https://github.com/erikras/ducks-modular-redux But testing stores is trivial!!!
- The connect() method has a workaround: see the `withRef` option. https://github.com/reactjs/react-redux/blob/master/docs/api.md This is actually a perfect example of how react state “traps” the application state.
- Instead of calling a method to get or change a component’s state, consider passing it from child to parent via a callback, and/or changing by dispatching a redux action. • Benefit: any part of the view heirarchy can now manipulate that state. E.g. a root view closing all dialogs. • Line 23 is calling a redux action. • Line 29 is an example of calling `closeDialogAction` in a promise chain
- The connect() method has a workaround: see the `withRef` option. https://github.com/reactjs/react-redux/blob/master/docs/api.md
- Should stores hold a single object? A list if it’s
- Actions that might be required by multiple disconnected components (e.g. initial data on page load) can easily be debounced to multiple expensive requests.
- This is how I manage the loading state. actionStarted() dispatches a loading increment action dispatchActionComplete() and dispatchError() does a decrement.
- Redux form solves the problem of trapping current form value in state
- Code for validation is trivial
- Andrew did a great presentation last month about React.js and I don’t think he used any flux framework. It works! • The unidirectional data flow does great things by itself. • You can build the rest (remote calls + app state) without too much effort.
- I’m thinking about ordering some shirts on Teespring – who’s interested? :D The end.
- I work at VoltServer – we make some pretty cool power disitribution technology. Ask me about Digital Electricity. It’s pretty rad.
- Extra stuff if there are questions.
- Actions are simple… Really simple.
- Replaced standard fetch actions with thunks to create cookie-cutter actions.
- Actions that might be required by multiple disconnected components (e.g. initial data on page load) can easily be debounced to multiple expensive requests.