Added an option to change the host NetworkTables uses to connect to the websocket. This is useful when the server serving the static files is different from the server serving the NetworkTables script and websocket.

Author: amorygalili

pynetworktables2js/js/networktables.js

@@ -294,7 +294,17 @@ var NetworkTables = new function () {
 		host = "ws:";
 	}
 
-	host += "//" + loc.host;
+	// If the websocket is being served from a different host allow users 
+	// to add a data-nt-host="" attribute to the script tag loading 
+	// Networktables.
+	var ntHostElement = document.querySelector('[data-nt-host]');
+	if (ntHostElement) {
+		var ntHost = ntHostElement.getAttribute('data-nt-host');
+		host += "//" + ntHost;
+	} else {
+		host += "//" + loc.host;
+	}
+
 	host += "/networktables/ws";
 
 	function createSocket() {

pynetworktables2js/tornado_handlers.py

@@ -26,6 +26,10 @@ def open(self):
         self.ioloop = IOLoop.current()
         self.ntserial = NTSerial(self.send_msg_threadsafe)
 
+    def check_origin(self, origin):
+        '''Allow CORS requests'''
+        return True
+
     def on_message(self, message):
         if self.ntserial is not None:
             self.ntserial.process_update(message)