create react component class
class MyComponent extends React.Component{
constructor(props){
super(props);
};
render(){
return(
<div>
<h1>
My First React Component!
</h1>
</div>
);
}
};props in react
function Welcome(props) {
return <h1>Hello, {props.name}</h1>;
}
function App() {
return (
<div>
<Welcome name="Sara" /> <Welcome name="Cahal" /> <Welcome name="Edite" /> </div>
);
}
ReactDOM.render(
<App />,
document.getElementById('root')
);render props
//Render props are functions that are passed to props as values
const User = (props) => {
const [name, setName] = useState('John')
//we pass values to prop-function as args
return <div>{props.render(name)}</div>
}
//Then we can use this component like this:
<div>
//when using the component we receive the passed values (name) as args here
<User render={(name) => <div>{name}</div>} />
</div>props in class react
class MouseTracker extends React.Component {
constructor(props) {
super(props);
this.handleMouseMove = this.handleMouseMove.bind(this);
this.state = { x: 0, y: 0 };
}
handleMouseMove(event) {
this.setState({
x: event.clientX,
y: event.clientY
});
}
render() {
return (
<div style={{ height: '100vh' }} onMouseMove={this.handleMouseMove}>
<h1>Move the mouse around!</h1>
<p>The current mouse position is ({this.state.x}, {this.state.y})</p>
</div>
);
}
}class to functional component react
// convert a class component to a functional component
class MyComponent extends React.Component {
state: {
name: 'Bob'
}
render() {
return (
<p>Hello, my name is {this.state.name}</p>
);
}
}
const MyComponent = () => {
const [name, setName] = React.useState('Bob');
return (<p>Hello, my name is {name}</p>);
}props react
function Welcome(props) { return <h1>Hello, {props.name}</h1>;
}
const element = <Welcome name="Sara" />;ReactDOM.render(
element,
document.getElementById('root')
);Copyright © 2021 Codeinu
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