reactjs

问题 I am building a multistep Form and I am trying to update my Data with the useState-Hook. Unfortunatly I do no how to pass the components of the hook as a prop, to update them, after performing an onClick Event Thats the important part of my code multisteform.js const defualtData = { Grundstück:'', Haus:"Haus", Wohnung:"Wohnung", Gewerbe:"Gewerbe", } const steps = [ {id: 'Häuser'}, {id: 'Fläche'}, {id: 'Grundstückerschlosse'}, {id: 'Bebauungsmöglichkeiten'} ] export const MultiStepFrom = () =>

问题 i am new in react can any one help us to write unit test code for below react code & basically i write test case for this below code but statement & functions coverage very low due to these code campaignGroupListing its is arrray of object in this code i find matching data and updated id record append in a new array ."campaignGroupListing.findIndex((item) => item.id === parseInt(id)); campaignGroupListing.splice(index, 1); campaignGroupListing.splice(index, 0, newArr); " import React, {

问题 I have a custom hook called Api which fetches data from my API & handles my auth token and refresh tokens. On my Main app, there are multiple ways that my state variable "postId" will be changed. And whenever it is changed, I want my API to fetch the new content for that. But I can't call my custom Api within useEffect, which is how I'm detecting changes in postId. Can someone please suggest a workaround? I spent forever making this API, now I feel like I can't even use it. Main.tsx: import

问题 I am playing around with reactjs and here is what I am doing: Am working on retrieving data from an API and displaying the data Using axios to make a call to the API. I know that axios calls are asynchronous and promise based. My understanding is that in react 'setState' can only be called after the component has mounted ( which happens in componentDidMount ). So the call to the API is made in 'componentDidMount' what I am not clear is : why does this work and why do I get the data displayed

问题 When I am in the login screen I would like once the user logs in that it is also redirected to the 'Home' screen but currently, I have an error telling me that the Home is not defined what is normal ... {isAuth ? ( <BottomTab.Screen name='Home' component={Home} /> ): ( <> <BottomTab.Screen name='Connexion' component={Login} /> <BottomTab.Screen name='Inscription' component={Register} /> </> I don't really know how to use contexts yet but I think it might simplify the thing but in the meantime

问题 We have a parent app which embed App.js and it will load it N times (in order to sync other embedded app) Code 1, this is my 1st implementation. When App() is loaded N times, store will be created N times. We only want to the store to be created once, but can be loaded N times. App.js --- function App() { const store = createReduxStore(); return ( <> <StoreContext.Provider value={store}> <Component /> </StoreContext.Provider> </> ); } Code 2, store is a ref now, but correct me if wrong,

问题 We have a parent app which embed App.js and it will load it N times (in order to sync other embedded app) Code 1, this is my 1st implementation. When App() is loaded N times, store will be created N times. We only want to the store to be created once, but can be loaded N times. App.js --- function App() { const store = createReduxStore(); return ( <> <StoreContext.Provider value={store}> <Component /> </StoreContext.Provider> </> ); } Code 2, store is a ref now, but correct me if wrong,

问题 I want to change innerHTML of a div , when I click on the button. I don't know why, but instead of getting an error, or getting the expected result it deletes to content and replacing it with "[object Object]" . How can I get it work? import React from 'react'; import Login from './components/login.js'; import SignIn from './components/signin'; import './App.css'; function App() { function LoginOnClick(){ document.getElementById("wrapper").innerHTML = <SignIn />; } return ( <div className=

问题 I am trying for few hours but can't figure out why my state is not called after adding an array of custom object . // In my component... const myRemoteArray = getRemoteArray() // Is working props.addAdItems(myRemoteArray) // Calls **1 via component.props /// ... const mapDispatchToProps = (dispatch) => { return { addAdItems: (items) => { // **1 // Items contains my array of objects dispatch(addAdItems(items)) // Calls **2 }, } } // My action export const addAdItems = (items) => { // **2 //

问题 I have a component that looks like this: import React, { Component } from 'react'; import connect from 'react-redux/es/connect/connect'; import { FormattedNumber } from 'react-intl'; class Currency extends Component { render() { const { setting, amount } = this.props; const { employee } = setting; const { currency = 'USD', currency_symbol } = employee.settings; /*eslint-disable react/style-prop-object*/ const applicable_symbol = currency_symbol || currency; return ( <FormattedNumber value=