qotnews/webclient/src/Feed.js

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import React from 'react';
import { Link } from 'react-router-dom';
import { Helmet } from 'react-helmet';
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import localForage from 'localforage';
import { sourceLink, infoLine, logos } from './utils.js';
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class Feed extends React.Component {
constructor(props) {
super(props);
this.state = {
stories: JSON.parse(localStorage.getItem('stories')) || false,
error: false,
};
}
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componentDidMount() {
fetch('/api')
.then(res => res.json())
.then(
(result) => {
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const updated = !this.state.stories || this.state.stories[0].id !== result.stories[0].id;
console.log('updated:', updated);
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this.setState({ stories: result.stories });
localStorage.setItem('stories', JSON.stringify(result.stories));
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if (updated) {
localForage.clear();
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result.stories.forEach((x, i) => {
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fetch('/api/' + x.id)
.then(res => res.json())
.then(result => {
localForage.setItem(x.id, result.story)
.then(console.log('preloaded', x.id, x.title));
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this.props.updateCache(x.id, result.story);
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}, error => {}
);
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if (i < 20 && x.img) {
const img = new Image();
img.src = x.img;
console.log('prefetched image', x.img);
}
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});
}
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},
(error) => {
this.setState({ error: true });
}
);
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}
render() {
const stories = this.state.stories;
const error = this.state.error;
return (
<div className='container'>
<Helmet>
<title>Feed - QotNews</title>
</Helmet>
{error && <p>Connection error?</p>}
{stories ?
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<div>
{stories.map((x, i) =>
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<div className='item' key={i}>
<div className='num'>
{i+1}.
</div>
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<div className='title'>
<Link className='link' to={'/' + x.id}>
<img className='source-logo' src={logos[x.source]} alt='source logo' /> {x.title}
</Link>
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<span className='source'>
&#8203;({sourceLink(x)})
</span>
</div>
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{infoLine(x)}
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</div>
)}
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</div>
:
<p>loading...</p>
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}
</div>
);
}
}
export default Feed;