react-redux - w3toppers.com

Get version number from package.json in React Redux (create-react-app)

Solving this without importing and exposing package.json to the create-react-app Requires: version 1.1.0+ of create-react-app .env REACT_APP_VERSION=$npm_package_version REACT_APP_NAME=$npm_package_name index.js console.log(`${process.env.REACT_APP_NAME} ${process.env.REACT_APP_VERSION}`) Note: the version (and many other npm config params) can be accessed Note 2: changes to the .env file will be picked only after you restart the development server

Component won’t update when a redux state change occurs

Array filter returns a new array, it does not update the original. Return directly or save to a variable to make changes const increaseItem = (array = [], dish) => { return array.filter(//your code here); //return array; } // OR const increaseItem = (array = [], dish) => { const newArray = array.filter(//your code here); … Read more

How can I dispatch function in redux?

My recommendation would be to not store redundant (derived) information in state. This means you don’t need to (nor should you!) store the total in the state. The main reason this is a problem is that it gives your state an opportunity to contradict itself… if your state’s total key doesn’t equal the sum of … Read more

Redux Presentational Components Vs Container Component

You’ll find your components much easier to reuse and reason about if you divide them into two categories. I call them Container and Presentational components. I assume you have knowledge about redux architecture Container Components Aware of redux Subscribe redux state Dispatch to redux actions Generated by react-redux Focus on how things work Presentational Componets … Read more

Global state in React Native

I usually create a global.js containing: module.exports = { screen1: null, }; And get the value of the state on the screen import GLOBAL from ‘./global.js’ constructor() { GLOBAL.screen1 = this; } Now you can use it anywhere like so: GLOBAL.screen1.setState({ var: value });

How to give Image src dynamically in react js?

if you dont want to require the image then you have to put all your images into public folder and then <img src={`../img/${img.code}.jpg`}></img> this method will work.

React router, pass data when navigating programmatically?

The current answers are outdated. React Router 6: Use the useNavigate hook: const navigate = useNavigate(); navigate(‘/other-page’, { state: { id: 7, color: ‘green’ } }); Then, you can access the state data in ‘/other-page’ via the useLocation hook: const {state} = useLocation(); const { id, color } = state; // Read values passed on … Read more

How does connect work without mapDispatchToProps

connect()(AddTodo) will pass dispatch as a prop to AddTodo component, which is still useful even without state or predefined actions. Thats the reason mapDispatchToProps is not needed in your code Now in your component let AddTodo = ({ dispatch }) => { you are destructuring your props to only access dispatch. If you make use … Read more

Getting error Cannot read property ‘setState’ of undefined

You should bind the handleChange function. You are getting this error because, in your handleChange function this keywork doesn’t refer to the context of the React Class and hence you need to bind the function. See this answer on why do you need to bind event handlers in React class HTMLEditor extends React.Component { constructor(props) … Read more

Changing the layout of a component depending on Redux state

connect state on your Child components Using connect on child components has the following advantages: Your parent component need not bother about connecting all the props required by its children even though the parent itself is not using the prop. Child components become more reusable, and easily maintainable. Avoids passing down props blindly from parent … Read more