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LoginHow to use React-redux to avoid local state in my code?
General Tech Bugs & Fixes 3 years ago
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manpreet 3 years ago
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
import React from 'react';
import ReactDOM 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);
class Comp1 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>
)
}
}
const Comp1Container = connect()(Comp1);
class Comp2 extends React.Component {
render() {
return (
<div>
<h1>Total items in cart: {this.props.cartQty}h1>
<h1>Tmanpreet 3 years ago
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
import React from 'react';
import ReactDOM 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);
class Comp1 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>
)
}
}
const Comp1Container = connect()(Comp1);
class Comp2 extends React.Component {
render() {
return (
<div>
<h1>Total items in cart: {this.props.cartQty}h1>
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manpreet![Tuteehub forum best answer]()
Best Answer
3 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: