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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Demo</title>
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
<style>
body {
font-family: 'Roboto';
background-color: #f2f2f2;
}
</style>
</head>
<body>
<demo-app></demo-app>
<script type="module">
import {LitElement, html, css} from 'https://unpkg.com/[email protected]?module';
import 'https://unpkg.com/@polymer/paper-card/paper-card.js?module';
import 'https://unpkg.com/@polymer/paper-fab/paper-fab.js?module';
import 'https://unpkg.com/@polymer/paper-button/paper-button.js?module';
import 'https://unpkg.com/@polymer/iron-icons/iron-icons?module';
class DemoApp extends LitElement {
static get properties() {
return {
stories: { type: Array },
filter: { type: String }
}
}
static get styles() {
return [
css`
:host {
display: flex;
flex-direction: column;
}
.stories {
display: flex;
flex-direction: column;
}
my-article {
margin: 10px;
}
header {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
margin-bottom: 20px;
}
`
]
}
constructor() {
super();
this.stories = [];
this.filter = 'all';
}
connectedCallback() {
super.connectedCallback();
fetch('https://newsapi.org/v2/everything?q=ing+bank&from=2019-01-01&sortBy=publishedAt&apiKey=0067878edf7d4084a6557032dbd0cab1')
.then((r) => r.json())
.then((r) => {
this.stories = r.articles.map((article, i) => {
return { ...article, id: i, read: false }
});
});
}
_toggleReadStatus(e) {
this.stories[e.detail].read = !this.stories[e.detail].read;
this.requestUpdate();
}
getFilteredStories(filter){
return this.stories.filter((article) => {
if(filter === 'read') return article.read;
if(filter === 'unread') return !article.read;
if(filter === 'all') return true;
});
}
render() {
return html`
<header>
<h1>The News</h1>
<div>
<paper-button raised @click=${() => this.filter = 'all'}>all</paper-button>
<paper-button raised @click=${() => this.filter = 'read'}>read (${this.getFilteredStories('read').length})</paper-button>
<paper-button raised @click=${() => this.filter = 'unread'}>unread (${this.getFilteredStories('unread').length})</paper-button>
</div>
</header>
<div class="stories">
${this.stories.filter((article) => {
if(this.filter === 'read') return article.read;
if(this.filter === 'unread') return !article.read;
if(this.filter === 'all') return true;
}).map((article) => {
return html`
<my-article
@toggled=${this._toggleReadStatus}
.read=${article.read}
.title=${article.title}
.description=${article.description}
.id=${article.id}>
</my-article>`;
})
}
</div>
`;
}
}
customElements.define('demo-app', DemoApp);
class Article extends LitElement {
static get properties() {
return {
title: { type: String },
description: { type: String },
read: { type: Boolean },
id: { type: Number }
}
}
static get styles() {
return [
css`
:host {
display: flex;
flex: 1;
}
paper-card {
flex: 1;
padding: 15px;
border-radius: 10px;
}
.header {
display: flex;
}
.header h2 {
flex: 1;
margin-right: 25px;
}
.buttons {
display: flex;
align-items: center;
justify-content: center;
}
`
]
}
_toggleRead() {
this.dispatchEvent(new CustomEvent('toggled', { detail: this.id }));
}
render() {
return html`
<paper-card>
<div class="header">
<h2>${this.title}</h2>
<div class="buttons">
${this.read ?
html`<paper-fab @click=${this._toggleRead} mini icon="icons:visibility"></paper-fab>` :
html`<paper-fab @click=${this._toggleRead} mini icon="icons:visibility-off"></paper-fab>`
}
</div>
</div>
<p>${this.description}</p>
</paper-card>
`;
}
}
customElements.define('my-article', Article);
</script>
</body>
</html>