Recent questions tagged ReactJs

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reactjs - How to use environment variables in React app hosted in Azure

I'm pretty new to React, and exploring Azure in general as well. I've gotten an ERP background, but that ... , in my React app? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Understanding why super() is deprecated in a React class component

I'm new to React and I'm learning about the React component lifecycle with the latest version of React. My " ... any>' is deprecated ts(6385) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - TypeScript error: Property 'X' does not exist on type 'Window'

I have added TS to my React/Redux app. I use window object in my app like this: componentDidMount() { let ... not specify FB property at all? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React: Show loading spinner while images load

I have a React app which makes a call in useEffect to my API which returns a list of URLs to use ... this would be greatly appreciated. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How do I insert a Django template variable into a React script?

I am using Django Rest Framework with React.js. My page shows one user's profile, using an api like this: ... .e., using a template variable? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Failed to run jetifier React Native

I tried to run react-native run-android and I got this error. info Running jetifier to migrate ... -communitycliuildcliEntry.js:210:24) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - why is componentWillReceiveProps deprecated?

I read through https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#fetching-external-data- ... thereby rerendering the component. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Native 0.57.1 Android Duplicate Resources

When running ./android/gradlew assembleRelease I get the following error: ``` * What went wrong: ... app/build/generated/res/react/release/drawable-mdpi/app_assets_images_character...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How do I set a timezone in my Jest config?

? npx jest --version 24.5.0 Got a set of jest tests that are timezone sensitive. We typically run them ... way to configure this for tests. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Hooks useCallback causes child to re-render

I'm trying to turn from class components to functional components using the new Hooks. However it feels that with ... height: 100%'> </div> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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reactjs - How to update array state in react native?

I am trying to update only one element in an array state but i am not sure of how to do it. State constructor( ... , how do i do that? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Passing array to useEffect dependency list

There's some data coming from long polling every 5 seconds and I would like my component to dispatch an action every ... }) => outcomeId) ) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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reactjs - google is not defined in react app using create-react-app

I create a react app using the cli called create-react-app. Look like Facebook did lots of things underneath, ... map via https? Any thoughts? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Context API - persist data on page refresh

Let's say we have a context provider set up, along with some initial data property values. Somewhere along ... other than simply local storage? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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reactjs - Using webpack aliases in mocha tests

I'm developing a web app at work in React/Redux/Webpack and am now starting to integrate testing with Mocha. ... into mocha when it runs. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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804 views

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reactjs - Line 0: Parsing error: Cannot read property 'map' of undefined

Currently starting up the server on my client side, the error above is what I have been getting. I am using ... return [fetch, state]; }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Pass function to child component

I want to pass a function to a child component but I'm getting this error. Invalid value for prop ... function from parent to child? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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667 views

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reactjs - How to use an array as option for react select component

If I wanna replace the options <option value="A">Apple</option> <option value="B">Banana</option> in the given ... "B">Banana</option> </select> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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635 views

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reactjs - React multiple contexts

I am using functions which are passed down through context. ChildComponent.contextType = SomeContext; Now I ... different parent components? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to configure react-script so that it doesn't override tsconfig.json on 'start'

I'm currently using create-react-app to bootstrap one of my projects. Basically, I'm trying to set up paths in ... app to use my custom configs? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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710 views

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reactjs - Select row on click react-table

I am trying to find the best table to use with my react apps, and for now, the react-table offers everything I ... not set the class to 'green' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

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reactjs - How do you manage asynchronous Store operations with Flux?

In the Facebook talk on the Flux architecture, Jing mentions at 12:17 that the dispatcher enforces that no ... the user from being dispatched. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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515 views

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reactjs - When to use componentWillReceiveProps lifecycle method?

I am new to React/Redux and have a problem with state. TrajectContainer.jsx class TrajectContainer extends React. ... I doing something wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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541 views

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reactjs - React.Component vs React.createClass

I am confused whats the difference between a component and a react class? And when do I use a component over a ... instances (via new) for you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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622 views

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reactjs - How to use generics in props in React in a functional component?

In a class based component, I can easily write some code like this: import * as React from 'react'; import { ... in props, any advise for me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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726 views

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reactjs - is there any way to access the parent component instance in React?

I know it's not a functional approach to be able to do something like this.parent in a React component, ... Any tips would be much appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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reactjs - React-Router open Link in new tab

Is there a way to get React Router to open a link in new tab? I tried this and it did not work. < ... there would be a console error. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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835 views

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reactjs - Cache busting with CRA React

When I updated my site, run npm run build and upload the new files to the server I am still looking the old ... one has a proper/simple answer. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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