reactjs

问题 I want to joi use regex pattern which define in variable I have a variable pattern which contains regex i.e pattern = "/^[0-9+]{7}-[0-9+]{1}$/" and this pattern send to Joi module and want to confirm module.exports = { save: { body: { match: Joi.string().regex(pattern).required } } } I know validation work if I use this module.exports = { save: { body: { match: Joi.string().regex(/^[0-9+]{7}-[0-9+]{1}$/).required } } } But in my case every time regex will different. So I can not use above

问题 I'm using react-bootstrap-table for datatable in react, Here am getting c=data from the backend as JSON object. How to add ahref to a column in react-bootstrap-table dynamically const data = [ { id: 0, name: 'John Doe', registered: '2018/01/01', role: 'Guest', status: 'Pending' }, { id: 1, name: 'Samppa Nori', registered: '2018/01/01', role: 'Member', status: 'Active' } ] <BootstrapTable data={this.data} version="4" striped hover pagination search options={this.options}> <TableHeaderColumn

问题 I'm using react-bootstrap-table for datatable in react, Here am getting c=data from the backend as JSON object. How to add ahref to a column in react-bootstrap-table dynamically const data = [ { id: 0, name: 'John Doe', registered: '2018/01/01', role: 'Guest', status: 'Pending' }, { id: 1, name: 'Samppa Nori', registered: '2018/01/01', role: 'Member', status: 'Active' } ] <BootstrapTable data={this.data} version="4" striped hover pagination search options={this.options}> <TableHeaderColumn

问题 I have a react select component that isn't recognizing the default value option. The code looks like this: renderPlans(){ if(this.props.plans){ let list = this.props.plans.map(item=>{ return ({label:item.description, value:item.id}) }); return( <Select name= "tile-plans" value= {this.state.selected} classNamePrefix='react-select-container' options={list} defaultValue={list[0]} onChange={(e) => { e ? this.setState({selected: e.value}) : this.setState({selected: ''}) }} /> ) } } from everything

问题 So I have been trying to setup React Js environment. I am facing the babel dependencies error. I know this problem is very common and there are tons of answers available but none of them have worked for me so far. I have searched through the internet to solve it but it still shows the same error. This is the error I am getting: ERROR in ./main.js Module build failed (from ./node_modules/babel-loader/lib/index.js): Error: Cannot find module 'babel-preset-es2015' from 'D:\my-app' at Function

问题 Before React16 , class components were used over functional components whenever there is a need to use state or lifecycle methods in your component. In the latest release react introduced Hooks and Effects using which we can use state and lifecycle methods inside our functional components . So is there any reason why still the class components exists? Is there any cases we still have to choose class components over functional 回答1: Here you can see the cases where you will need class

问题 Before React16 , class components were used over functional components whenever there is a need to use state or lifecycle methods in your component. In the latest release react introduced Hooks and Effects using which we can use state and lifecycle methods inside our functional components . So is there any reason why still the class components exists? Is there any cases we still have to choose class components over functional 回答1: Here you can see the cases where you will need class

问题 I'm trying to run my first React JSX file with create-react-app with version 4.0.0 and it works! However, I don't have the import statements of React included in my JSX and it works too but it is very weird. The project is created by create-react-app command with version 4.0.0. The App.js file: /* without import React but works too! */ import { Component } from "react"; class App extends Component { render() { return <div>456</div>; } } export default App; 回答1: This is new with the JSX

问题 I was browsing through this repo on Github and was trying to comprehend the working of the code Here, the author (or programmer) have mentioned import * at multiple places so I am trying to comprehend and understand how import * work? First in Game.js file of his repo he have mentioned/written like this import * as actions from '../actions'; In VS Code, when if I click on '../actions using command It is redirecting me to this file -> index.js then in Index.js they have something like this

问题 I'm building a react application, and I'm importing a node module which uses the spread operator ... and I'm getting an error "Module parse failed: Unexpected token (100:6)" at this operator. How can I get this to work? Thanks 回答1: The create-react-app cli has already bundled this ES2015 feature. Older babel does not support this and needs to be installed separately Now assuming you setup your react manually and not using the create-react-app. You can set up this by installing the package