react-props

问题 I'm new to react and I am trying to fetch data from an API and pass the data to a child component. I've passed the data to the state on my parent component, however, when I pass it to the child component as props it logs as an empty array. I'm sure there is something simple I am overlooking but I don't know what, my code is below PARENT COMPONENT import React, {Component} from 'react'; import Child from '../src/child'; import './App.css'; class App extends Component { constructor(props) {

问题 This is my first post on StackOverflow, so apologies if I'm not following the correct format. I'm building my first app using tab navigator from React Navigation v 5.x and have run into a big problem when passing props from one screen to another What I want to achieve is to: Make changes to a list of data in one of my screens. Have those changes affect what happens on another screen. I have tried this (I failed to set the props to pass down), this (Deprecated version of react-navigation) and

问题 This is my first post on StackOverflow, so apologies if I'm not following the correct format. I'm building my first app using tab navigator from React Navigation v 5.x and have run into a big problem when passing props from one screen to another What I want to achieve is to: Make changes to a list of data in one of my screens. Have those changes affect what happens on another screen. I have tried this (I failed to set the props to pass down), this (Deprecated version of react-navigation) and

问题 This is my first post on StackOverflow, so apologies if I'm not following the correct format. I'm building my first app using tab navigator from React Navigation v 5.x and have run into a big problem when passing props from one screen to another What I want to achieve is to: Make changes to a list of data in one of my screens. Have those changes affect what happens on another screen. I have tried this (I failed to set the props to pass down), this (Deprecated version of react-navigation) and

问题 This is my first post on StackOverflow, so apologies if I'm not following the correct format. I'm building my first app using tab navigator from React Navigation v 5.x and have run into a big problem when passing props from one screen to another What I want to achieve is to: Make changes to a list of data in one of my screens. Have those changes affect what happens on another screen. I have tried this (I failed to set the props to pass down), this (Deprecated version of react-navigation) and

问题 So this is a little crazy. There's a web app that I use that is built with React, which has made certain design decisions that I disagree with. Luckily, the design is actually simple to change exactly the way I want. I can just open the Chrome React devtools and change the props assigned to a specific component. But I don't want to manually do this every time, that's not worth it. I want to write a (super hacky) personal bit of javascript that I can inject into the page, which modifies the

问题 So this is a little crazy. There's a web app that I use that is built with React, which has made certain design decisions that I disagree with. Luckily, the design is actually simple to change exactly the way I want. I can just open the Chrome React devtools and change the props assigned to a specific component. But I don't want to manually do this every time, that's not worth it. I want to write a (super hacky) personal bit of javascript that I can inject into the page, which modifies the

问题 I've heard that passing an arrow function as a prop is not ideal because it creates a new function every time which will lead to performance issues. However, I'm not entirely sure how to completely move away from them, as can be seen by the example below: class Home extends Component { onCardPress = (message) =>{ alert(message) } render(){ return( <View> <Card onCardPress={this.onCardPress} message="Hello world!" /> </View> ) } } class Card extends Component { render(){ const { onCardPress ,

问题 A React.js warning was thrown: IndexPage: It is not recommended to assign props directly to state because updates to props won't be reflected in state. In most cases, it is better to use props directly. I had the following code: class IndexPage extends React.Component<IProps, IState> { constructor(props) { super(props) this.state = props } } But, when I have changed my code to: class IndexPage extends React.Component<IProps, IState> { constructor(props) { super(props) this.state = {...props}

问题 I'm fairly new to React native . I have created a Drawer Navigator in my App.js file. One of my navigation Components is a component named LoginScreen . I am trying to to pass a prop to LoginScreen to display when the user navigates to it. App.js (Navigator) const Tab = createMaterialBottomTabNavigator() const Stack = createStackNavigator() const Drawer = createDrawerNavigator() export default class App extends Component { constructor(props) { super(props) this.state = { isAdmin: 'false',