Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
I am learning redux and I have put up a simple code which uses the store, action and reducer. I am using store.subscribe() to listen for changes in the state and using it to update my local state.
There are few things that you need to take care of.
First, you need to have a react-redux installed and then use Provider component at the top level to which you pass store
Second: You need to connect the components that need to access store or dispatch
Third: You need to render the connected components
Fourth: You need mapStateToProps to be passed to container which access state and mapDispatchToProps to accesses dispatch or make action creators available as props to components. In case you do not pass mapDispatchToProps to connect, by default dispatch prop is made available to the component. You can look at the API docs here
Fifth Create store after defining changeState reducer and initialState
importReact from 'react';importReactDOM from 'react-dom';import{ createStore } from 'redux';import{ connect,Provider} from 'react-redux'var initialState ={
qty:0,
price:0}function changeState(state = initialState, action){switch(action.type){case'INCREMENT':var stateCopy1 =Object.assign({}, state);
stateCopy1.qty = stateCopy1.qty + action.qty;
stateCopy1.price = stateCopy1.price + action.price;return stateCopy1;default:return state;}}var store = createStore(changeState);classComp1 extends React.Component{
increase =()=>{var action ={
type:'INCREMENT',
qty:1,
price:100}this.props.dispatch(action);}
render(){return(<button type="button" onClick={this.increase}>Increasebutton>)}}constComp1Container= connect()(Comp1);classComp2 extends React.Component{
render(){return(<div><h1>Total items in cart:{this.props.cartQty}h1><h1>T
There are few things that you need to take care of.
First, you need to have a react-redux installed and then use Provider component at the top level to which you pass store
Second: You need to connect the components that need to access store or dispatch
Third: You need to render the connected components
Fourth: You need mapStateToProps to be passed to container which access state and mapDispatchToProps to accesses dispatch or make action creators available as props to components. In case you do not pass mapDispatchToProps to connect, by default dispatch prop is made available to the component. You can look at the API docs here
Fifth Create store after defining changeState reducer and initialState
importReact from 'react';importReactDOM from 'react-dom';import{ createStore } from 'redux';import{ connect,Provider} from 'react-redux'var initialState ={
qty:0,
price:0}function changeState(state= initialState, action){switch(action.type){case'INCREMENT':varstateCopy1 =Object.assign({},state);stateCopy1.qty =stateCopy1.qty + action.qty;stateCopy1.price =stateCopy1.price + action.price;returnstateCopy1;default:returnstate;}}var store = createStore(changeState);classComp1 extends React.Component{
increase =()=>{var action ={
type:'INCREMENT',
qty:1,
price:100}this.props.dispatch(action);}
render(){return(<button type="button" onClick={this.increase}>Increasebutton>)}}constComp1Container= connect()(Comp1);classComp2 extends React.Component{
render(){return(<div><h1>Total items in cart:{this.props.cartQty}h1><h1>T
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manpreet
Best Answer
2 years ago
I am learning redux and I have put up a simple code which uses the store, action and reducer. I am using store.subscribe() to listen for changes in the state and using it to update my local state.
Below is my entire code in index.js: