script.js

var wsocket;

function connect() {
	console.log("connect");
	wsocket = new WebSocket(serviceLocation);
	wsocket.binaryType = "arraybuffer";
	wsocket.onmessage = onMessageReceived;
	wsocket.onclose = onclose;
}

function onMessageReceived(evt) {
	console.log("JSON : " + evt.data);
	var message = JSON.parse(evt.data);
	var elt = document.getElementById(message.nodeId);
	switch (message.msgType) {
	case 'A':
		var parent = document.getElementById(message.parentId);
		if (parent == null) {
			console.log("Unreached parent on add. parent id  : "
					+ message.parentId + " for element : " + message.nodeId);
			break;
		}
		elt = document.createElement(message.tagHtml);
		elt.id = message.nodeId;
		switch (message.tagHtml) {
		case "a":
			elt.href = "#";
			elt.onclick = function() {
				wsocket.send(JSON.stringify({
					msgType : "A",
					nodeId : this.id
				}));
				return false;
			};
			break;
		case "button":
			elt.onclick = function() {
				wsocket.send(JSON.stringify({
					msgType : "A",
					nodeId : this.id
				}));
			};
			break;

		case "select":
			elt.onchange = function() {
				wsocket.send(JSON.stringify({
					msgType : "U",
					nodeId : this.id,
					selectedIndex : this.selectedIndex
				}));
			}
			break;
		case "section":
			elt.classList.add("adding");
			break;
		case "div":
			elt.classList.add("adding");
			break;
		case "header":
			elt.classList.add("adding");
			break;
		case "footer":
			elt.classList.add("adding");
			break;
		}
		;
		parent.insertBefore(elt, parent.children[message.nextId]);
		break;
	case 'R':
		elt.parentNode.removeChild(elt);
		break;
	case 'UT':
		if (elt.tagName == "INPUT") {
			if (message.type == "checkbox")
				elt.checked = message.checked;
			else
				elt.value = message.textContent;
		} else
			elt.textContent = message.textContent;
		break;
	case 'US':
		elt.selectedIndex = message.selectedIndex;
		break;
	case 'AC':
		elt.classList.add(message.styleClass);
		break;
	case 'RC':
		elt.classList.remove(message.styleClass);
		break;
	case 'AS':
		elt.style[message.styleProperty] = message.styleValue;
		break;
	case 'RS':
		elt.style.removeProperty(message.styleProperty);
		break;
	case 'AA':
		elt.setAttribute(message.attributeName, message.attributeValue);
		switch (message.attributeName) {
		case "value":
			elt.value = message.attributeValue;
			break;
		case "checked":
			elt.checked = message.attributeValue;
			break;
		case "list":
			elt.oninput = function(e) {
				console.log("oninput");
				var val = elt.value;
				var opts = document.getElementById(elt.getAttribute("list")).childNodes;
				for (var i = 0; i < opts.length; i++) {
					if (opts[i].innerText === val) {
						wsocket.send(JSON.stringify({
							msgType : "U",
							nodeId : this.id,
							textContent : this.value
						}));
						wsocket.send(JSON.stringify({
							msgType : "A",
							nodeId : this.id
						}));
						break;
					}
				}
			}
			break;
		case "type":
			switch (message.attributeValue) {
			case "text":
				elt.onkeyup = function(e) {
					var code = (e.keyCode ? e.keyCode : e.which)
					if (code == 13) {
						wsocket.send(JSON.stringify({
							msgType : "A",
							nodeId : this.id
						}));
					} else {
						wsocket.send(JSON.stringify({
							msgType : "U",
							nodeId : this.id,
							textContent : this.value
						}));
					}
				};
				elt.onblur = function(e) {
					wsocket.send(JSON.stringify({
						msgType : "A",
						nodeId : this.id
					}));
				}
				break;
			case "checkbox":
				elt.onchange = function() {
					wsocket.send(JSON.stringify({
						msgType : "U",
						nodeId : this.id,
						eltType : elt.type,
						checked : this.checked
					}));
				};
				elt.checked = message.checked;
				break;

			case "radio":
				elt.name = document.getElementById(message.parentId).parentNode.id;
				elt.onclick = function() {
					wsocket.send(JSON.stringify({
						msgType : "U",
						nodeId : this.parentNode.parentNode.id,
						eltType : elt.type,
						selectedIndex : selectIndex(this.name)
					}));
				};
				break;
			}
			break;
		}
		break;
	case 'RA':
		elt.removeAttribute(message.attributeName);
		if (message.attributeName == "value")
			elt.value = "";
		if (message.attributeName == "checked")
			elt.checked = false;
		break;
	default:
		alert("Unknown message received");
	}
}

function onclose(evt) {
	alert("Socket has closed with code : " + evt.code);
}

function selectIndex(name) {
	var buttons = document.getElementsByName(name);
	for (var i = 0; i < buttons.length; i++) {
		if (buttons[i].checked) {
			return i;
		}
	}
}

window.onclick = function(event) {
	var modal = document.getElementsByClassName("modal");
	var i;
	for (i = 0; i < modal.length; i++) {
		var id = modal[i].id;
		if (modal[i].style.display == "flex" && event.target.id == id) {
			document.getElementsByName("close")[i].click();
		}
	}
}