reactjs

问题 I have this timer in ReactJS that uses the computer's clock's time to run, which is supposedly more accurate than incrementing/decrementing the timer by 1 using setInterval with interval of 1 second. However, even when relying on the computer's clock, the timer's time drifts (by comparing it to this clock my app timer drifted 3 seconds in delay after 15 minutes running), and at some point it even stopped completely, while using other tabs in purpose . import React, { useState, useEffect }

问题 Using material-ui in my react app, is there a way I can change the position when the dialog is opened? now it's always centered. Thanks in advance! 回答1: You can create styles and pass it through classes prop. Here is an example of how you could do that. import React from 'react'; import { makeStyles, Dialog } from '@material-ui/core'; const useStyles = makeStyles({ dialog: { position: 'absolute', left: 10, top: 50 } }); function Example() { const classes = useStyles(); return ( <Dialog

问题 I've a ReactJS client which uses EventStream and a golang backend which implements SSE. Everything seemed to work when I connected my browser to the backend running on localhost, as well as when my backend was running on k8s with port forwarding. As soon as I created an ingress with a hostname (so that I don't have to port-forward all the time) SSE stopped working. I still see that the client sends the request and this request is received and registered by the backend. However, when and event

问题 I have a React app using react-apollo:2.5.8 and a library of custom components that I install via NPM and use within the app. The library has react-apollo:2.5.8 listed in peer and dev dependencies. Ever since I upgraded react-apollo to 2.5.8 I have been getting this error `Uncaught Invariant Violation: Could not find "client" in the context of ApolloConsumer. Wrap the root component in an <ApolloProvider>.` I tried listing React-apollo within externals in the Webpack build for the library as

问题 I have a React app using react-apollo:2.5.8 and a library of custom components that I install via NPM and use within the app. The library has react-apollo:2.5.8 listed in peer and dev dependencies. Ever since I upgraded react-apollo to 2.5.8 I have been getting this error `Uncaught Invariant Violation: Could not find "client" in the context of ApolloConsumer. Wrap the root component in an <ApolloProvider>.` I tried listing React-apollo within externals in the Webpack build for the library as

问题 I want to return null if condition meets and if not render a component using ternary operator in react and typescript. What I am trying to do? I have the code like below, {condition1 && condition2 && ( <firstdiv> <seconddiv> <Icon /> </seconddiv> </firstdiv> )} So as seen above if condition1 and condition2 is true then it renders firstdiv . Now I have to return null if condition3 is true . So in easy if and else something like this, if (condition1 && condition2) { if (condition3) { return

问题 I want to return null if condition meets and if not render a component using ternary operator in react and typescript. What I am trying to do? I have the code like below, {condition1 && condition2 && ( <firstdiv> <seconddiv> <Icon /> </seconddiv> </firstdiv> )} So as seen above if condition1 and condition2 is true then it renders firstdiv . Now I have to return null if condition3 is true . So in easy if and else something like this, if (condition1 && condition2) { if (condition3) { return

问题 When I use tag as shown below, I'm getting this error! React TypeError: Class constructor Fullpage cannot be invoked without 'new' It looks like something went wrong in line 1438: renderWithHooks node_modules/react-dom/cjs/react-dom.development.js:14803 this is my Fullpage.js file: import React, {Component} from 'react'; import './Fullpage.css' class Fullpage extends Comment{ render(){ const {children}=this.props return( <div className={`fullpage ${this.props.className || ''}`}> {children} <

问题 I need to replace \n to <br> . But it is taking this as in text. How can I do that without using dangerouslySetInnerHTML ? 回答1: var yourNewValueWithBr = yourOldValue.replace(/\n/g,"<br />"); After replacing this text, you will need to use dangerouslySetInnerHTML to render it as HTML. 回答2: Insert the text as you normally would, and fix the line breaks with CSS: white-space: pre-wrap; Don't use dangerouslySetInnerHTML unless you really have to. 回答3: This solution replaces \n to <br> and works

问题 I have bookManageReducer.jsx : import { combineReducers } from 'redux' import { REQUEST_BOOKS_PAGE, RECEIVE_BOOKS_PAGE } from '../constants/dashboardConstants' const books = (state = [], action) => { switch (action.type) { case RECEIVE_BOOKS_PAGE: return action.books default: return state } } const booksState = (state = {isFetching: false}, action) => { switch (action.type) { case REQUEST_BOOKS_PAGE: return {isFetching: true} case RECEIVE_BOOKS_PAGE: return {isFetching: true} default: return