reactjs

问题 I am trying to use docker-compose for react-typescript application with webpack-dev-server below is my Dockerfile FROM node:lts-slim RUN mkdir -p /usr/src/app WORKDIR /usr/src/app EXPOSE 3000 CMD [ "npm", "start" ] "start": "webpack-dev-server --port 3000" this package.json line docker-compose.yml version: "3" services: frontend: container_name: awesome_web build: context: ./client dockerfile: Dockerfile image: webpack ports: - "3000:3000" volumes: - ./client:/usr/src/app I executed command

问题 React docs: Never mutate this.state directly, as calling setState() afterwards may replace the mutation you made. Treat this.state as if it were immutable. That's clear. class App extends React.Component { state = { data: [] } the following I understand updateState(event) { const {name, value} = event.target; let user = this.state.user; // this is a reference, not a copy... user[name] = value; // return this.setState({user}); // so this could replace the previous mutation } this following I

问题 When I run npx create-react-app appname I get the following error message: You are running `create-react-app` 4.0.0, which is behind the latest release (4.0.1). We no longer support global installation of Create React App. Please remove any global installs with one of the following commands: - npm uninstall -g create-react-app - yarn global remove create-react-app The latest instructions for creating a new app can be found here: https://create-react-app.dev/docs/getting-started/ npm ERR! code

问题 I'm working on my MERN app, and when I'm logging smth in NewsPage component, it logs infinitely. NewsPage component: const NewsPage = ({news, fetchNews}) => { const postNews = (title, body) => { axios.post("http://localhost:9000/news", { title, body }); } useEffect(() => { fetchNews(); }, [fetchNews, postNews]) return ( <> <AddNewsForm postNews={postNews}/> <h1>News:</h1> <NewsItemPage news={news} /> </> ); }; const mapStateToProps = state => ({ news: state.news }) export default connect

问题 Introduction: I have a ApexCharts chart with data from an API. I'm using an API called finnhub to get the stock market data which is displayed on the chart. The data returned has an array of prices and a corresponding array of times, which are not at an equal interval (stock market is closed at certain times) (prices on the y-axis and time on the x-axis). The data I'm getting is quite high resolution, which means there are a LOT of labels on the x-axis, making it look really cluttered and

问题 I am using the react-datepicker package.https://reactdatepicker.com/ I am trying to create a custom date picker with a years range, following their example but I can not make the range work. I am not even sure if I am importing that range from the right place tbh. My code: import DatePicker, {getYear, getMonth, range} from 'react-datepicker'; import "react-datepicker/dist/react-datepicker.css"; const Foo = () => { const [startDate, setStartDate] = useState(new Date()); const years = range

问题 I have multiple svg files and I want to import and export all of them in a single file: icons.js import IconVideoOn from '../../assets/img/icons/video-on.svg'; import IconVideoOff from '../../assets/img/icons/video-off.svg'; import IconMicOn from '../../assets/img/icons/mic-on.svg'; import IconMicOff from '../../assets/img/icons/mic-off.svg'; . . . export default { IconVideoOn, IconVideoOff, IconMicOn, IconMicOff }; then I'm importing them like this MyComponent.jsx import { IconVideoOn } from

问题 I have following code in my react component: //some code var timeout = null; //global variable //some more code useEffect(() => { if(...some condition) { console.log('test1'); timeout = setTimeout(() => { console.log('test2'); }, 15 * 1000); } else { console.log('test3'); clearTimeout(timeout); } }, [some other condition]); The output I get in the console: test1 test3 test2 //after 15 seconds So I am trying to start timeout which will log 'test2', if in the meantime timeout was not cleared.

问题 I am having troubles while implementing use-supercluster with TypeScript. I am trying to use clusters to differentiate two types of data in a Google Map with something like red clusters vs. green clusters. I can't find any documentation related to use this library with TypeScript and I am not getting enough information from its types: So, what is argument P ? I was following the use-supercluster creator's guide to add clusters but after installing supercluster types I am getting errors here:

问题 I am having troubles while implementing use-supercluster with TypeScript. I am trying to use clusters to differentiate two types of data in a Google Map with something like red clusters vs. green clusters. I can't find any documentation related to use this library with TypeScript and I am not getting enough information from its types: So, what is argument P ? I was following the use-supercluster creator's guide to add clusters but after installing supercluster types I am getting errors here: