As Context is no longer an experimental feature and you can use Context in your application directly and it is going to be great for passing down data to deeply nested components which what it was designed for. As Mark Erikson has written in his blog: If you’re only using Redux to avoid passing down props, context could … Read more
When you include a main page component in your app, it is often wrapped in a <Route> component like this: By doing this, the MoviesIndex component has access to this.props.history so it can redirect the user with this.props.history.push. Some components (commonly a header component) appear on every page, so are not wrapped in a <Route>: This means the header cannot redirect the user. … Read more
Unexpected token errors in ESLint parsing occur due to incompatibility between your development environment and ESLint’s current parsing capabilities with the ongoing changes with JavaScripts ES6~7. Adding the “parserOptions” property to your .eslintrc is no longer enough for particular situations, such as using in ES6 classes as ESLint is currently unable to parse it on … Read more
The change event is triggered on the <select> element, not the <option> element. However, that’s not the only problem. The way you defined the change function won’t cause a rerender of the component. It seems like you might not have fully grasped the concept of React yet, so maybe “Thinking in React” helps. You have to store the selected value as state and … Read more
You need to define propTypes as a static getter if you want it inside the class declaration: If you want to define it as an object, you need to define it outside the class, like this: Also it’s better if you import prop types from prop-types, not react, otherwise you’ll see warnings in console (as preparation for React 16):
Cloning children with new props You can use React.Children to iterate over the children, and then clone each element with new props (shallow merged) using React.cloneElement. For example: Calling children as a function Alternatively, you can pass props to children with render props. In this approach, the children (which can be children or any other prop name) is a function which … Read more
Exporting an arrow function directly doesn’t give the component a displayName, but if you export a regular function the function name will be used as displayName. You can also put the function in a variable, set the displayName on the function manually, and then export it.
Props and state are related. The state of one component will often become the props of a child component. Props are passed to the child within the render method of the parent as the second argument to React.createElement() or, if you’re using JSX, the more familiar tag attributes. The parent’s state value of childsName becomes the child’s this.props.name. From the … Read more
Firstly Delete package-lock.json file in your project folder. And then install dependencies again by npm install. That should solve this issue.
You rewrite the context of the class method when you pass it to props like this because of JS OOP system. So to make it work there are several approaches: 1) This is not so good because bind always returns new function and your component will re-render even if there are no updates in props … Read more