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Async Component in Preact
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import { h, Component } from 'preact'; | |
class AsyncComponent extends Component { | |
constructor() { | |
super(); | |
this.state = { loading: true }; | |
this.getAsyncState = this.getAsyncState.bind(this); | |
this.update = this.update.bind(this); | |
} | |
getAsyncState() { | |
let { promise, ...props } = this.props; | |
this.setState({ loading: true, error: null }); | |
return promise(props); | |
} | |
update() { | |
this.getAsyncState() | |
.then(asyncState => this.setState({ loading: false, asyncState })) | |
.catch(error => this.setState({ loading: false, error })); | |
} | |
componentDidMount() { | |
this.update(); | |
} | |
componentDidUpdate(prevProps) { | |
let queryRegex = /[?#]/; | |
if(this.props.url.split(queryRegex)[0] !== prevProps.url.split(queryRegex)[0]) { | |
this.update(); | |
} | |
} | |
render({ Component, promise, ...props }, { asyncState, ...state }) { | |
return <Component { ...props } { ...asyncState } { ...state } />; | |
} | |
} | |
export default function withAsync(Component, promise) { | |
return function(props) { | |
return <AsyncComponent Component={Component} promise={promise} {...props} />; | |
}; | |
} |
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