React setState với map
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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>Hello React</title> <script src="https://unpkg.com/react@16/umd/react.development.js"></script> <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script> <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script> </head> <body> <div id="member"></div> <script type="text/babel"> class Member extends React.Component { constructor(props) { super(props); this.state = { users: [ { id: 1, name: "Bùi Văn Tèo", age: 25 }, { id: 2, name: "Trần Văn An", age: 29 }, { id: 3, name: "Nguyễn Thị Bưởi", age: 22 } ], job: "IT Communicator" }; }; changeItem = () => { let key = 2; this.setState(prevState => ({ users: prevState.users.map( item => item.id === key? { ...item, name: 'Dương Minh Trí', age: 4 }: item ) })) }; render() { return ( <div> <ul> {this.state.users.map(item => ( <li key={item.id}> <h2>Tên: {item.name}</h2> <div>Tuổi: {item.age}</div> </li> ))} </ul> <button type="button" onClick={this.changeItem}>Update</button> </div> ); }; }; ReactDOM.render( <Member />, document.getElementById('member') ); </script> </body> </html>
