state react
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}what is state in react
// State is essentially a global class variable
// that is modified when the component updates
class Clock extends React.Component {
constructor(props) {
super(props);
this.state = {date: new Date()};
}
render() {
return (
<div>
<h1>Hello, world!</h1>
<h2>It is {this.state.date.toLocaleTimeString()}.</h2>
</div>
);
}
}react lifecycle hooks
class ActivityItem extends React.Component {
render() {
const { activity } = this.props;
return (
<div className='item'>
<div className={'avatar'}>
<img
alt='avatar'
src={activity.actor.avatar_url} />
</div>
<span className={'time'}>
{moment(activity.created_at).fromNow()}
</span>
<p>{activity.actor.display_login} {activity.payload.action}</p>
<div className={'right'}>
{activity.repo.name}
</div>
</div>
)
}
}Copyright © 2021 Codeinu
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