redux

问题 I am learning react-redux, so I am creating a CRUD app for users using JSON placeholder API, now I am able to display data, delete and edit, but I have a problem with adding data. Here is a live demo in the sandbox : redux live demo Now when I click add user button I get the following error. Cannot read property 'editing' of undefined. Here is my form component to add a user. import React, { useState } from 'react' import {useDispatch} from 'react-redux' import {addUser, addNewUser } from '.

问题 I have a drum app in React/Redux that's fully functional as it stands, but I want to be able to apply the active button style when the corresponding keypress is made just like it does when I physically click the button. As it stands, clicking the button does a transition but typing the corresponding key just plays the audio file, and isn't really linked to the button. Is there a way to mark the corresponding button active on keypress? Heres my CodeSandbox: https://codesandbox.io/s/k29r3928z7

问题 I have a drum app in React/Redux that's fully functional as it stands, but I want to be able to apply the active button style when the corresponding keypress is made just like it does when I physically click the button. As it stands, clicking the button does a transition but typing the corresponding key just plays the audio file, and isn't really linked to the button. Is there a way to mark the corresponding button active on keypress? Heres my CodeSandbox: https://codesandbox.io/s/k29r3928z7

问题 With redux-saga, one can execute multiple effects in parallel: import { call } from 'redux-saga/effects' // correct, effects will get executed in parallel const [users, repos] = yield [ call(fetch, '/users'), call(fetch, '/repos') ] How can i create those "call"-calls programmatically ? What i want to achieve is this: Lets say i have an array with different parameters and i want to execute a request to a server per parameter, but in parallel with redux-saga: const parameters = ['abc', 'def',

问题 I'm using react-router-dom v5.2. Upon login, I want my page to redirect to /home from / . The login form is at / . When I try to perform authentication without any async function (ie. comparing username and password to hardcoded values in react), everything works perfectly. But when I do perform authentication using express and mongo, the redirection upon login stops working. If I login again, then the redirection happens. Protected routes still work (redirect to login page if the user is not

问题 I'm using react-router-dom v5.2. Upon login, I want my page to redirect to /home from / . The login form is at / . When I try to perform authentication without any async function (ie. comparing username and password to hardcoded values in react), everything works perfectly. But when I do perform authentication using express and mongo, the redirection upon login stops working. If I login again, then the redirection happens. Protected routes still work (redirect to login page if the user is not

问题 I am learning Typescript and I am trying to implement a simple React/Redux app. When I use sync actions it works fine, but the problems are with the async action. I am following the official redux tutorial. First I declare the state for the session export interface UserSessionState { loggedIn: boolean; } Then I declare the interface for the action interface UpdateSessionAction { type: 'USER_LOGIN'; payload: boolean; } I export them with Union Types export type UserActionTypes =

问题 Below is my component class. The component never seems to execute componentWillUpdate(), even when I can see the state updating by logging before the return in mapStateToProps. The state is 100% changing, however the component doesn't refresh. import React, { Component } from 'react' import { connect } from 'react-redux' import { search } from './mapActions' import L from 'leaflet' class Map extends Component { componentDidMount() { L.Icon.Default.imagePath = './images' this.map = new L.Map(

问题 Good evening everybody! I'm a total beginner in React and Redux so please bear with me if this sounds totally stupid. I'm trying to learn how I can perform some API calls in Redux and it's not going all to well. When I console log the request from the action creator the promise value is always "undefined" so I'm not sure if I'm doing this correctly. My goal is to grab the information from the data inside the payload object and display them inside the component. I've been trying to get this to

问题 Update to the original post: I have realized that the issue is that the updates in the Redux state (props to the WaitingRoom component) somehow set the entire state of the component to its initial state. Thus, "showmatchingwindow" was set to false as well. Initially, after MATCHING_REQUEST was dispatched and "loading" was set to true, the state of WaitingRoom component still remained unchanged. However, after MATCHING_SUCCESS was dispatched and "loading" turned false and "buddy" and "chatid"