reactjs

问题 I want to render items from props, I can do it with initial state, but not with response from server. My render function : const { data } = this.props; return ( <div > {data.map((item, index) => <div key={index} className="row"> <span data = { data } className="number col-4 col-md-8">{item._id}</span> <span data = { data } className="date col-4 col-md-2">{item.date}</span> <span data = { data } className="tag col-4 col-md-2">{item.tag}</span> <div className="col-md-12 "> {item.text} </div> <

问题 I want to render items from props, I can do it with initial state, but not with response from server. My render function : const { data } = this.props; return ( <div > {data.map((item, index) => <div key={index} className="row"> <span data = { data } className="number col-4 col-md-8">{item._id}</span> <span data = { data } className="date col-4 col-md-2">{item.date}</span> <span data = { data } className="tag col-4 col-md-2">{item.tag}</span> <div className="col-md-12 "> {item.text} </div> <

问题 Let's say I have a component with a scrollable subcomponent, and I want to expose the ability to scroll: const MyComponent = (props) => { return <ScrollView ... /> } I want to be able to do <MyComponent ref={myRef} /> ... myRef.scrollTo({x: 0}); So I need a way to forward the ref to the <ScrollView> . Let's try putting the ref on the props: const MyComponent = (props) => { return <ScrollView ref={props.scrollRef} ... /> } ... <MyComponent scrollRef={myRef} /> ... myRef.scrollTo({x: 0}); I

问题 I'm tryna get the contacts list of the device but react-native-contacts returns undefined. I've Installed the package and linked it as mentioned in the project's GitHub page https://github.com/rt2zz/react-native-contacts I've also added the permissions to the android-manifest file. How do I get it works 回答1: This happens mostly because of the linking-step was missing as there are native modules required: After npm install react-native-contacts (or yarn add ) you are required to link the stuff

问题 I wrote two sample components to show what I'm trying to do. If the call was from the same class, I could do like below. onClick={this.myFunc.bind(this, param1, param2)} How do I do the same thing from a stateless component without the need to mess with binding 'this'. onClick={props.onClick['need to add params']} import React from 'react'; class BigComponent extends React.Component{ constructor(props){ super(props); this.handleClick = this.handleClick.bind(this); } handleClick(param1, param2

问题 I have proptypes shown below interface Props { resource: string; create?: boolean; route?: string; } As can be seen above, create and route are optional props. However, I would like to implement the types such that if create prop is present then route must now be required. Anyone have any ideas how to do this? 回答1: You should group these props and make that grouped prop optional as interface RouteProps{ create: boolean; route: string; } interface Props { resource: string; routeInfo?:

问题 I have proptypes shown below interface Props { resource: string; create?: boolean; route?: string; } As can be seen above, create and route are optional props. However, I would like to implement the types such that if create prop is present then route must now be required. Anyone have any ideas how to do this? 回答1: You should group these props and make that grouped prop optional as interface RouteProps{ create: boolean; route: string; } interface Props { resource: string; routeInfo?:

问题 I have proptypes shown below interface Props { resource: string; create?: boolean; route?: string; } As can be seen above, create and route are optional props. However, I would like to implement the types such that if create prop is present then route must now be required. Anyone have any ideas how to do this? 回答1: You should group these props and make that grouped prop optional as interface RouteProps{ create: boolean; route: string; } interface Props { resource: string; routeInfo?:

问题 I'm build a simple app that expands and collapses sections of content based on their state. Basically, if collapse = false, add a class and if it's true, add a different class. I'm using Next.js with Redux and running into an issue. I'd like to update the state based on an argument the action is passed. It's not updating the state and I'm not sure why or what the better alternative would be. Any clarification would be great! // DEFAULT STATE const defaultState = { membership: 'none',

问题 I'm trying to set up tslint to work on a small sample React/Typescript project, following a tutorial online. When I either run yarn lint or simply enter tslint --project in the terminal, I keep getting the error Invalid option for project: true I've done a lot of googling, and I can't find what I'm doing wrong. My tslint.json is { "extends": [ "tslint:recommended", "tslint-react", "tslint-config-prettier" ], "rules": { "ordered-imports": false, "object-literal-sort-keys": false, "no-console":