Created
January 7, 2017 22:44
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Demonstrates compositional components in Preact (or React). Live demo: https://jsfiddle.net/developit/umnb4y87/
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import { h, cloneElement, Component } from 'preact'; | |
/** Example <Fetch url="/foo.json" /> compositional component. | |
* Just to demonstrate a compositional component that requires input massaging. | |
*/ | |
class Fetch extends Component { | |
state = { loading: true }; | |
componentDidMount() { | |
this.update(); | |
} | |
componentDidUpdate(prevProps) { | |
if (this.props.url!==prevProps.url) { | |
this.update(); | |
} | |
} | |
update() { | |
let { url, as='json' } = this.props; | |
this.setState({ loading:true, error:null }); | |
fetch(url) | |
.then( r => r[as]() ) | |
.then( data => this.setState({ loading:false, data }) ) | |
.catch( error => this.setState({ loading:false, error }) ); | |
} | |
render(props, state) { | |
// just pass all state to the child as props | |
return cloneElement(props.children[0], state); | |
} | |
} | |
/** "Smart" component, akin to a Controller. | |
* Typically arguments/props to this come from the URL. | |
*/ | |
const ProfilePage = ({ id }) => ( | |
<Fetch url={'/user/'+encodeURIComponent(id)} as="json"> | |
<ProfileView full={true} /> | |
</Fetch> | |
); | |
/** "Dumb" view component, analagous to a template */ | |
const ProfileView = ({ loading, data, error }) => ( | |
<div class="some-view" data-loading={loading}> | |
{ error && <ErrorBox error={error} /> } | |
{ data && ( | |
<div class="profile"> | |
<h1>{data.name}</h1> | |
<p>{data.bio}</p> | |
<a href={data.url} target="_blank">{data.urlName}</a> | |
</div> | |
) } | |
</div> | |
); | |
/** A "template partial" */ | |
const ErrorBox = ({ error }) => ( | |
<div class="error"> | |
<h1>We have a problem!</h1> | |
<pre>{error.message}</pre> | |
</div> | |
); | |
// magic: | |
render(<ProfilePage id="5" />, document.body); |
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