add some map basics

htdocs/map.js

@@ -0,0 +1,30 @@
+(function(){
+    var protocol = 'ws';
+    if (window.location.toString().startsWith('https://')) {
+        protocol = 'wss';
+    }
+
+    var ws_url = protocol + "://" + (window.location.origin.split("://")[1]) + "/ws/";
+    if (!("WebSocket" in window)) return;
+
+    var ws = new WebSocket(ws_url);
+    ws.onopen = function(){
+        console.info("onopen");
+        ws.send("SERVER DE CLIENT client=map.js type=map");
+    };
+    ws.onmessage = function(){
+        console.info("onmessage");
+    };
+    ws.onclose = function(){
+        console.info("onclose");
+    };
+
+    window.onbeforeunload = function() { //http://stackoverflow.com/questions/4812686/closing-websocket-correctly-html5-javascript
+        ws.onclose = function () {};
+        ws.close();
+    };
+    ws.onerror = function(){
+        console.info("onerror");
+    };
+
+})();