reactjs

问题 I'm using redux-saga to fetch server api data. My question is that I'm trying to design following code. However yield put(get01Action(members)); which is commented out has following Syntax error. A 'yield' expression is only allowed in a generator body. I don't know how to manage it. import '@babel/polyfill'; import { fork, take, put } from 'redux-saga/effects'; import axios from "axios"; export function* rootSaga(){ yield fork(fetch01); yield fork(fetch02); } function* fetch01() { while

问题 i am currently setting up a test environment and come across a problem, that all my calls to .hasClass return false. Current Setup: My react components import scss files with an import statement. For example: import styles from "./text.scss"; To test the components i had to define the moduleNameMapper in the jest.config.js file like so: moduleNameMapper: { "\\.(scss|less)$": "<rootDir>/__mocks__/styleMock.js" }, I think that the moduleNameMapper is kind of responsible for the problems, since

问题 I could quite advanced in code. And now I'm calculating subtotal. I could calculate the subtotal of first element from detail, but my error is in componentDidUpdate. In componentDidUpdate if I execute this code, componentDidUpdate(prevProps, detail, index) { if (this.props.isSubtotal !== prevProps.isSubtotal) { this.props.dispatch( //NEED TO MAKE THE FOLLOWING LINE DYNAMIC AND NOT [0] change('bill', `detail[0].subtotal`, this.props.isSubtotal) ); } } Works with out any problem. But if I

问题 I have an sql Store Procedure with output parameter.I have used this output parameter to show the message from back end to front end application. and also I have used this functionality in C# code,It works fine as per my requirement.I would like to know how to use these functionality in "NodeJS and React Apps" . Please check my below sql store procedure and C# coding which I have done.It will be very useful to all of node js and react js developer to implement this. SQL Store Procedure with

问题 This question already has answers here : ReactJs: Prevent multiple times button press (9 answers) Closed 2 years ago . I have this code in my component; I want to prevent multiple clicking because it avoids my preventing code to add the element with the same id, can anybody help me to write a function maybe kind of setTimeOut() or something like that to prevent the second click to pass after 1 second or half a second so multiple clicking can be prevented state = { redirect: false, loading:

问题 In short: I want to use XMLHttpRequest in Gatsby, which works in development mode, but fails in production ( gatsby build ) mode, which I can't get fixed. Some more information: I want to access an API (to be precise the GitHub API). Therefore I make an HTTP request like that: const repoRequest = new XMLHttpRequest(); const repoUrl = "https://api.github.com/user/repos?visibility=all?type=all"; repoRequest.open("GET", repoUrl); repoRequest.setRequestHeader("Authorization", "token <here would

问题 I am trying to use the above code, but I am getting an error during the build process saying this.selectTable is null. Can anybody help me out with this? I have followed this logic - Access filtered data in ReactTable <ReactTableComponent ref={this.reactTable} className="polls-table" defaultPageSize={10} getTrProps={(_, rowInfo = {}) => { let { index = 0 } = rowInfo; return { style: { background: index % 2 ? "#fafafa" : "#FFFFFF" } }; }} columns={columns} data={polls} /> <Button color=

问题 I would like to start creating an application that will use Java on the backend and frontend react and redux. I tried to find a tutorial where it would be described how to start a project that will use these technologies (spring boot, redux 4 and react). Unfortunately, I did not find any such tutorial. Could you please help me and give me some tips how to get started? Thank you. 回答1: you can use Jhipster to create a project and add an appropriate dependency take look at this resource :

问题 I was using the api to try and get the data of my profile through the access token. I used the given code from the authorization example code given in the website, and I used let parsed = queryString.parse(window.location.search); let accessToken = parsed.access_token; console.log(parsed); console.log(accessToken); fetch('https://api.spotify.com/v1/me', { headers: {'Authorization': 'Bearer' + accessToken}, json: true }).then((res) => res.json()) .then(data => console.log(data)); } But the 400

问题 I'm trying to use multer to support file upload from my react app client to my node/express backend. For some background, I've been using postman 6.7.2, node 8.11.1, express 4.16.3, and multer 1.4.1. After following a tutorial, I could use postman to log req.body and see the entries in the formdata; as in I can log the req.body and the req.file in the route handler () and the file even saves. But when I try sending a request from my react app, the req.body logs as {} and the req.file logs as