Improve join error msg handling

static/main.js

@@ -2,7 +2,7 @@ let joinAttempts = 0
 
 function loginOrRegister(force){
 	if (joinAttempts > 5) {
-		throw "failed to join"
+		throw lastError || "failed to join"
 	}
 	joinAttempts++
 
@@ -115,6 +115,7 @@ function handleResponse(action, response){
 
 let intervalId;
 let sock;
+let lastError;
 
 function createSocket() {
 	if (sock) {
@@ -145,15 +146,16 @@ function createSocket() {
 		if (data.code < 300) {
 			handleResponse(data.cmd, data.msg);
 		} else {
-			if (data.code !== 200 && data.cmd === "join") {
-				// if registration was unsuccessful, don't stick with if after reload
-				try {
-					sock.send(JSON.stringify(loginOrRegister(true)));
-				} catch (e) {
-					alert(e)
+			if (data.code !== 200) {
+				lastError = data.msg;
+				if (data.cmd === "join") {
+					// if registration was unsuccessful, don't stick with if after reload
+					try {
+						sock.send(JSON.stringify(loginOrRegister(true)));
+					} catch (e) {
+						changeTeamName(e)
+					}
 				}
-			} else {
-				alert([data.code, data.msg]);
 			}
 		}
 	};

web/socket.go

@@ -97,7 +97,11 @@ func socketHandler(session sockjs.Session) {
 
 func joinTeam(joinTeamId string, session sockjs.Session, teamId *string, userId string) {
 	name, e := db.GetTeam(session.Context(), joinTeamId)
-	weFdUp := e != redis.Nil
+	weFdUp := true
+	if e == redis.Nil {
+		weFdUp = false
+		e = errors.New("invalid team id")
+	}
 	if handleError(session, e, weFdUp, "join") {
 		return
 	}