reactjs

问题 In the effort to better learn React, TypeScript, and Context / Hooks, I'm making a simple Todo app. However, the code needed to make the context feels cumbersome. For example, if I want to change what a Todo has, I have to change it in three places (ITodo interface, default context value, default state value). If I want to pass down something new, I have to do that in three places (TodoContext, TodoContext's default value, and value=). Is there a better way to not have to write so much code?

问题 I'm trying to make my own Tabs component, so that I can use tabs in my app. However I seem to be having issues trying to extract the child components I need by type. import React from 'react' export class Tabs extends React.Component { render() { let children = this.props.children let tablinks = React.Children.map(children, x => { console.log(x.type.displayName) // Always undefined if (x.type.displayName == 'Tab Link') { return x } }) return ( <div className="tabs"></div> ) } } export class

问题 I'm trying to make my own Tabs component, so that I can use tabs in my app. However I seem to be having issues trying to extract the child components I need by type. import React from 'react' export class Tabs extends React.Component { render() { let children = this.props.children let tablinks = React.Children.map(children, x => { console.log(x.type.displayName) // Always undefined if (x.type.displayName == 'Tab Link') { return x } }) return ( <div className="tabs"></div> ) } } export class

问题 With the update react native to version 0.63 , new components have appeared. Can someone more experienced explain how the Pressable differs from the TouchableOpacity and when it is better to use them. 回答1: Pressable was a new introduction to RN 0.63, prior to that,Touchable Opacity was the most common used Component to wrap a component or simliar components. Both their basic functionalities are same, to make a text/image clickable and user interactive. But with Pressable you get to access a

问题 With the update react native to version 0.63 , new components have appeared. Can someone more experienced explain how the Pressable differs from the TouchableOpacity and when it is better to use them. 回答1: Pressable was a new introduction to RN 0.63, prior to that,Touchable Opacity was the most common used Component to wrap a component or simliar components. Both their basic functionalities are same, to make a text/image clickable and user interactive. But with Pressable you get to access a

问题 Error: unable to resolve "./safeAreaContext" from node-module/react-native-safe-area-context 来源： https://stackoverflow.com/questions/61995712/unable-to-resolve-safeareacontext-from-react-native-safe-area-context

问题 I started out trying to style <Link> elements from react-router . <Link style={{display: 'flex'}}>...</Link> but it seems like it strips the display CSS property specifically. Does anyone know why and how to fix it? I get the same problems with <a style={{display: 'flex', marginTop: '10px'}}>Test link</a> (Result: Only margin-top: 10px is applied) EDIT: For future reference, as I see this page still gets some views: I really tried using multiple vendor-specific display CSS attributes, and not

问题 i am working on a react.js project which authenticate from firebase but i have 3 multiple type of user's in it (super Admin,vendor admin,vendor staff) with different privileges. how can i authenticate them from firebase and get to know this is my venor admin or vendor staff etc ???? because firebase just authenticate single type of user! 回答1: You can control access via custom claims using the Firebase Admin SDK on your own server of through Cloud Functions for Firebase. Set claims server side

问题 I am adding a group of markers to a map using react-leaflet. At present I can display the markers on the map with a custom icon. How do add a record of data to each marker. I assume I have to somehow create a custom marker class? Does anyone now how I could add a data record to each marker or at least an index. This is the code so far: import React, { Component } from 'react'; import { Map, TileLayer, Marker } from 'react-leaflet'; import {Navbar, Nav, NavDropdown} from 'react-bootstrap';

问题 I am very new to reactJs. I am trying to change the tab on click of button. For this I am using browserHistory . Problem here is url is getting changed but component is not getting rendered. Couldn't understand this. browserHistory.push("/personalInfo"); This is how I am trying to change the tab. Url is getting changed to http://localhost:3000/personalInfo . But component is not rendered, when I refresh the browser, it's getting changed. 回答1: Use withRouter import React, { Component } from