Recent questions tagged ReactJs

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reactjs - How do I define methods in stateless components?

If I simply have: const App = function() { return ( <div>{this.renderList()}</div> ) } How do I define the ... () {}. What's the right syntax? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to specify a constructor with a functional component (fat arrow syntax)?

Given this component: import React from 'react' import ReactDOM from 'react-dom' import PropTypes from 'prop ... extends React.Component syntax? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Passing function as a param in react-navigation 5

NOTE: This query is for react-navigation 5. In react navigation 4 we could pass a function as a param ... calling_code: calling_code }); }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Fragments giving Unexpected token error in React 16.2

I have the following component that renders a series of components. However, I downloaded React 16.2 and tried to use ... AnswersCard} </> ) } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - How to compress build with/without ejecting create-react-app. Also include compressed file into script tag into index.html

I'm using react-scripts build to make production ready build and to deploy it on AWS server I'm using ... gzipped files would be served. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Why can't useEffect access my state variable in a return statement?

I don't understand why my useEffect() React function can't access my Component's state variable. I'm trying to ... 's going on here. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Use components from two versions of the same library (npm / Material UI in my case)

I'm using the latest stable version of Material UI in my production React app. I need the updated Data ... through NPM? Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React-router 2.0 browserHistory doesn't work when refreshing

Below codes report 404 not found when refreshing on page http://localhost/about. But if browserHistory is changed ... prototype' of undefined'). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React - Jest - Enzyme: How to mock ref properties

I'm writing test for a component with ref. I'd like to mock the ref element and change some properties but ... ('elmHeight')).toEqual(100); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - webpack umd lib and external files

I want to package my react component as a umd lib. below is webpack my setting: module.exports = { devtool: ' ... have any idea of this? thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Accessing context from useEffect

I have a context that is used to show a full page spinner while my application is performing long running tasks ... am I missing the something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Using fetch API with mode: 'no-cors', can’t set request headers

I am trying to hit a service end point and the service is a login service I am using the authentication ... response calls from the network tabs See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React-native/react-navigation: how do I access a component's state from `static navigationOptions`?

How do you handle cases when you have, say, a form component, and you need to submit a part of the component's ... goes here </View> ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Catch all redirect for create-react-app in netlify

I have a built using create-react-app and hosted in netlify. In this link it is mentioned that I need to ... all redirect for create-react-app? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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991 views

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reactjs - Calling Dispatch function from a blank javascript file

So i'm writing a React-Redux web app, and i call dispatch from my react components like this : this.props. ... in this case ? Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Redux Form: How to handle multiple buttons?

I am trying to add a second submit button to a redux-form. Both buttons should dispatch an action that saves ... save and route as intended. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Click events not firing on mobile

I've been working with react for a couple of months now, but have just run into something a little weird. Click ... behaviour, or simply a bug? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React useCallback with Parameter

Using React's useCallback hook is essentially just a wrapper around useMemo specialized for functions to avoid ... benefits of memoization? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React without Webpack

I started to look into ReactJS. It seems that Facebook just released version 15.0.1. I looked into this ... Any help would be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - TS2339: Property 'props' does not exist on type 'Home'

I have a very basic program of react with tsx, I am getting an error which I am not able to figure out why ... "app")) git clone this for code See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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reactjs - How to get the data from React Context Consumer outside the render

I am using the new React Context API and I need to get the Consumer data from the Context.Consumer variable and ... and none worked. Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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994 views

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reactjs - How to submit form from a button outside that component in React?

I have a form in one of my React components, and and in the outside component that calls it I want to pass ... when In Root button is clicked? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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959 views

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reactjs - How to dispatch Redux action from stateless component when route is loaded?

Goal: when loading a react-router route, dispatch a Redux action requesting asynchronic Saga worker to fetch data for ... not the correct way. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - React Router v4 routes not working

I am relatively new to reacts and I'm trying to figure out how to get React router to work. I've got a ... out what. I am also using Webpack. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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899 views

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reactjs - How to focus something on next render with React Hooks

I'm playing with hooks, and I'm trying to do the following: import React, { useState, useRef } from ' ... workaround. Is there a different way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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798 views

1 answer

reactjs - Create React App not working

Help! I have no idea what is going on here, create react app is not working I have also tried ... error react react-dom react-scripts See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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881 views

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reactjs - Set component's props dynamically

I need to set component's props after it is stored in a variable, here is pseudo code: render(){ let items ... I stored earlier in a variable? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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reactjs - Cannot read property ‘params’ of undefined (React Router 4)

I have a route set up to render a component: <Route exact path="/page/:id" location={this.props.location} key ... not in a render function. Why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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