reactjs

问题 I would like to be able to use computed values for sub keys when updating state in React. I understand how to use computed values in straightforward settings like this: this.setState({ [name]: value }); But I am having trouble getting key-value computation to work for a situation like this: constructor(props) { super(props); this.state = { foo: { a: 1, b: 2 } }; } const keyToChange = 'a'; const value = 3; this.setState({ foo[keyToChange]: value }); How can I make something that works like

问题 I'm using React.js. I want to use the data I have captured in Mock Api in product detail in an e-commerce site, but I get the following error. My goal here is to extract and print data from Mock API in ProductDetail. ProducDetail.js; const ProductDetail = (props) => { const { name, description, price } = props; const axios = require('axios'); const [dress, setDress] = useState([]); useEffect(() => { axios .get(`{url}`) .then(function (response) { setDress(response.data.dress); }) .catch

问题 I'm using React.js. I want to use the data I have captured in Mock Api in product detail in an e-commerce site, but I get the following error. My goal here is to extract and print data from Mock API in ProductDetail. ProducDetail.js; const ProductDetail = (props) => { const { name, description, price } = props; const axios = require('axios'); const [dress, setDress] = useState([]); useEffect(() => { axios .get(`{url}`) .then(function (response) { setDress(response.data.dress); }) .catch

问题 I'm trying to send a multipart/form-data from React Native (Running on Simulator) to backend server using XHR with the following code let xhr = new XMLHttpRequest(); xhr.open('POST', 'http://....url....'); let formdata = new FormData(); formdata.append('title','This is awesome'); xhr.send(formdata); However in console log the Request Payload are shown as [object Object] So I decided to take the same code and put it in an HTML file and run from Chrome browser and Request Payload from console

问题 I'm trying to send a multipart/form-data from React Native (Running on Simulator) to backend server using XHR with the following code let xhr = new XMLHttpRequest(); xhr.open('POST', 'http://....url....'); let formdata = new FormData(); formdata.append('title','This is awesome'); xhr.send(formdata); However in console log the Request Payload are shown as [object Object] So I decided to take the same code and put it in an HTML file and run from Chrome browser and Request Payload from console

问题 I am trying to configure CSS modules with webpack but I get an error. I have checked the other answers here on stackoverflow but none of the solutions have made it work for me so far. I have added the loader as the docs suggest but it still shows an error. This is my webpack.configuration.js file. const path = require('path'); const HtmlWebpackPlugin = require('html-webpack-plugin'); module.exports = { entry: './src/index.js', output: { path: path.join(__dirname, '/dist'), filename: 'index

问题 Have a question regarding react router. I have a header item that I would like to display for all routes. And of course, I want this to be part of the so that the user can click items from a nav. Currently I have my <Header /> outside of my <Router> and I guess this isn´t working since my router then don't know to re-render? import { BrowserRouter as Router, Route, Switch } from 'react-router-dom' <div> <Header /> <Router> <Switch> <Route exact path="/" component={Posts} /> <Route exact path=

问题 I'm working on a multilange static landing page in a Next.Js project. My goal is to have the following structure: / -> English Home page /de -> German Home page /it -> Italian Home page I'm building it in the following way: pages/index.js export default function Home() { return <div>English Homepage</div> } pages/de.js export default function Home() { return <div>German page</div> } In order to make the website accessible, I would like to set html lang accordingly. pages/_document.js class

问题 I've played around with the code for a while now. I'm grabbing data from Firebase and populating a list of objects from that data onto this UserProfile page. I just want it to work so that when I go on the profile page, a list of their items is listed there. The problem is that with this version of the code I have to click on the profile link twice for the items to show up, but the display name shows up fine. I know setState is asynchronous. I've tried setting the state in a callback in

问题 I am using axios to download a file (~100MB) from an Azure Storage Blob. axios({ method: 'get', url: uri, onDownloadProgress: (progressEvent) => { console.log("Loaded: " + ((progressEvent.loaded / progressEvent.total) * 100) + "%"); }, responseType: 'arraybuffer' }).then({}) My problem is that it is taking quite a while to actually download the file (~10 minutes). I was previously using fetch() which was slower than this even (~15-20 minutes). Are there any recommendations you guys have on