88 lines
1.9 KiB
JavaScript
88 lines
1.9 KiB
JavaScript
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import { html, css, LitElement } from 'https://unpkg.com/lit-element/lit-element.js?module';
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export class WebsocketConnection extends LitElement {
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static get styles() {
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return css``;
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}
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static get properties() {
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return {
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url: { type: String }
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}
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}
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constructor() {
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super();
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this.url = '';
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this.socket = null;
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}
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onopen(event){
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console.log("websocket connected");
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}
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onclose(event){
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console.log("websocket closed");
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}
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onerror(event){
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console.log("websocket error, closing...");
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if (this.socket && this.socket.readyState === WebSocket.OPEN) {
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this.socket.close();
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}
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}
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onmessage(event){
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console.log("received message:", event.data);
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}
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isSocketConnected(){
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if (! this.socket){
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return false;
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}
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if (this.socket.readyState === WebSocket.OPEN) {
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return true;
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}
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return false;
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}
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sendMessage(msg){
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if (this.isSocketConnected()) {
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var string_msg = JSON.stringify(msg);
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this.socket.send(string_msg);
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}
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else {
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console.error("cannot send message, websocket disconnected");
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}
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}
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connect() {
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console.log(`connect to ${this.url}...`);
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this.socket = new WebSocket(this.url);
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this.socket.onopen = (event) => this.onopen(event);
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this.socket.onclose = (event) => this.onclose(event);
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this.socket.onerror = (event) => this.onerror(event);
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this.socket.onmessage = (event) => this.onmessage(event);
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}
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update(props) {
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if (props.has("url")){
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this.connect();
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}
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super.update(props);
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}
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render() {
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// do nothing
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return html``;
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}
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}
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customElements.define('websocket-connection', WebsocketConnection);
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