reactjs - Read For Learn

React Navigation back() and goBack() not working

The key property for goBack() is a dynamically created string, created by react-navigation whenever it navigates to a new route. for example: It is stored in this.props.navigation.state.key. So if you want to go from EditPage to Cover, what you have to do is to pass the key of EditCover down to EditPage, and then call goBack() with the key. Why not key of Cover but EditCover? Because react-navigation only provides the method goBack(key), it’s go … Read more

What is withRouter for in react-router-dom?

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

Component definition is missing display name react/display-name

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.

react-scripts: command not found

Firstly Delete package-lock.json file in your project folder. And then install dependencies again by npm install. That should solve this issue.

Adding an .env file to React Project

4 steps npm install dotenv –save Next add the following line to your app.require(‘dotenv’).config() Then create a .env file at the root directory of your application and add the variables to it. Finally, add .env to your .gitignore file so that Git ignores it and it never ends up on GitHub. If you are using create-react-app then you only need step 3 and … Read more

What exactly is the ‘react-scripts start’ command?

create-react-app and react-scripts react-scripts is a set of scripts from the create-react-app starter pack. create-react-app helps you kick off projects without configuring, so you do not have to setup your project by yourself. react-scripts start sets up the development environment and starts a server, as well as hot module reloading. You can read here to see what everything it does for … Read more

When to use React setState callback

When a react component state changes, the render method is called. Hence for any state change, an action can be performed in the render methods body. Is there a particular use case for the setState callback then?

How to fix missing dependency warning when using useEffect React Hook

If you aren’t using fetchBusinesses method anywhere apart from the effect, you could simply move it into the effect and avoid the warning If however you are using fetchBusinesses outside of render, you must note two things Is there any issue with you not passing fetchBusinesses as a method when it’s used during mount with its enclosing closure? Does … Read more

Axios having CORS issue

your server should enable the cross origin requests, not the client. To do this, you can check this nice page with implementations and configurations for multiple platforms

Reactjs this.setState is not a function error

You need to bind this.showProfile in the component constructor this.showProfile = this.showProfile.bind(this) More detail about this on the Handling Events page of the React doc : https://facebook.github.io/react/docs/handling-events.html

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