One-KVM/kvmd/web/js/keyboard.js

var keyboard = new function() {
	this.installCapture = function(ws) {
		// https://www.codeday.top/2017/05/03/24906.html
		tools.info("Installing keyboard capture ...")
		document.onkeydown = (event) => __keyHandler(ws, event, true);
		document.onkeyup = (event) => __keyHandler(ws, event, false);
		$("hid-keyboard-led").className = "led-on";
	};

	this.clearCapture = function() {
		tools.info("Removing keyboard capture ...")
		document.onkeydown = null;
		document.onkeyup = null;
		$("hid-keyboard-led").className = "led-off";
	};

	var __keyHandler = function(ws, event, state) {
		// https://github.com/wesbos/keycodes/blob/gh-pages/scripts.js
		tools.debug("Key", (state ? "pressed:" : "released:"), event)
		event.preventDefault();
		ws.send(JSON.stringify({
			event_type: "key",
			key: event.code,
			state: state,
		}));
	};
};