Add dialog for join form

components/join.js

@@ -0,0 +1,45 @@
+import { html, Component } from "../lib/index.js";
+
+export default class Join extends Component {
+	state = {
+		channel: "#",
+	};
+
+	constructor(props) {
+		super(props);
+
+		this.handleChange = this.handleChange.bind(this);
+		this.handleSubmit = this.handleSubmit.bind(this);
+	}
+
+	handleChange(event) {
+		var target = event.target;
+		var value = target.type == "checkbox" ? target.checked : target.value;
+		this.setState({ [target.name]: value });
+	}
+
+	handleSubmit(event) {
+		event.preventDefault();
+
+		var params = {
+			channel: this.state.channel,
+		};
+
+		this.props.onSubmit(params);
+	}
+
+	render() {
+		return html`
+			<form onChange=${this.handleChange} onSubmit=${this.handleSubmit}>
+				<label>
+					Channel:<br/>
+					<input type="text" name="channel" value=${this.state.channel} autofocus required/>
+				</label>
+				<br/>
+
+				<br/>
+				<button>Join</button>
+			</form>
+		`;
+	}
+}