Created
June 29, 2019 17:31
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| import { css, CSSResult, LitElement, html, customElement, property, TemplateResult } from 'lit-element'; | |
| @customElement('kafka-consumer') | |
| export class KafkaConsumer extends LitElement { | |
| @property({ type: Array }) | |
| private message: string; | |
| public static get styles(): CSSResult { | |
| return css` | |
| div { | |
| border: 2px solid black; | |
| padding: 1em; | |
| font-size: 1.5em; | |
| color: blue; | |
| background-color: lightyellow; | |
| } | |
| `; | |
| } | |
| public constructor() { | |
| super(); | |
| this.socketConnect(); | |
| } | |
| protected render(): TemplateResult { | |
| return html` | |
| <div> | |
| <p>${this.message}</p> | |
| </div> | |
| `; | |
| } | |
| private socketConnect(): void { | |
| const ws = new WebSocket('ws://localhost:3210', ['json']); | |
| ws.addEventListener( | |
| 'open', | |
| (): void => { | |
| console.log('websocket connection open'); | |
| } | |
| ); | |
| // Listen to messages coming from the server over the Web Socket | |
| ws.addEventListener('message', this.handleMessage.bind(this)); | |
| } | |
| private handleMessage(event: MessageEvent): void { | |
| console.log('Received:', event.data); | |
| this.message = event.data; | |
| } | |
| } |
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