'How to Immediately Update Components Based on User Interaction with React/Redux' react redux
After testing the API endpoints , I started by setting up my action types and action creators for the Dog API GET request. I’m able to create async actions thanks to redux-thunk. For this small example, I’ve left my fetch requests inside the action creators.
The following are the results of the action creator, with the loading action, which will be important later. >shibaActions.js function shibesRequested { return { type: shibaConstants.SHIBES_REQUESTED } } function success { return { type: shibaConstants.SHIBES_FETCHED, payload: result } } function failure { return { type: shibaConstants.SHIBE_FETCH_FAIL, payload: error } }>shibaReducer.js const reducer==>{ switch { case shibaConstants.SHIBES_REQUESTED: return { ...state, shibasLoading: true, shibasFetched: false } case shibaConstants.SHIBES_FETCHED: return { ...state, shibasLoading: false, shibasFetched: true, shibas: action.payload } case shibaConstants.SHIBE_FETCH_FAIL: return { ...state, shibasLoading: false, shibasFetched: false } default: return state } }, and this setup allows the use of both dev tools and middleware . >index.js import { compose, createStore, applyMiddleware } from 'redux'; import { Provider } from 'react-redux'; import thunk from 'redux-thunk'; import reducer from './store/shibaReducer'; const rootReducer=reducer; const composeEnhancers=window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose; const store=createStore)); ReactDOM.render ); On to our components! I set up App.js to display Shiba pictures based on a number in local state. Were this a real app, I would take the time to create a unique key and alt text for each picture. >App.js import { connect } from 'react-redux'; import { shibaActions } from './store/shibaActions'; import Counter from './components/Counter'; function App { const [number, setNumber]=useState; useEffect=>{ props.fetchShibes }, []); if { return } else { let shibaImages=props.shibes.map; }) return ; } } const mapStateToProps==>{ return { shibes: state.shibas } } const mapDispatchToProps==>{ return { fetchShibes: =>dispatch) } } export default connect;Dependency Array means the page won’t re-render indefinitely, nor will a re-render be triggered by updates to the component’s dependencies.and the React team advise against empty Dependency Arrays because they’ll hide bugs. Now that my shibes are being displayed, I’ll start the counter component. Because this API doesn’t have POST, UPDATE, or DELETE endpoints, the counter will change the value oflet url=`https://dog.ceo/api/breed/shiba/images/random/${num}`; First I update my action types, action creators, and reducer. In this small example, I’m using a single file for each of these, but I would typically have multiple reducers and use the>shibaActions.js function addOne { return dispatch=>{ let number=num + 1; dispatch) } function add { return { type: shibaConstants.ADD_ONE, payload: number } } } function subOne { return dispatch=>{ let number=num - 1; dispatch) } function sub { return { type: shibaConstants.SUB_ONE, payload: number } } } >shibaReducer.js case shibaConstants.ADD_ONE: return { ...state, counter: action.payload } case shibaConstants.SUB_ONE: return { ...state, counter: action.payload }>shibaReducer.js const initialState={shibasLoading: false, shibasFetched: false, counter: 1};>Counter.js import React from 'react'; import { connect } from 'react-redux'; import { shibaActions } from '../store/shibaActions'; function Counter { const handleOnAdd==>{ props.addOne } const handleOnSub==>{ props.subOne } return } const mapStateToProps==>{ return { counter: state.counter } } const mapDispatchToProps==>{ return { addOne: =>dispatch), subOne: =>dispatch) } } export default connect; Next, to make our page reload every time the button clicks change the counter, we have to go back to App.js. We’ll useto access the counter within the page component, and pass it instead of the local state
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