update for the javascript

main.go

@@ -256,19 +256,45 @@ func uploadFileForServer(sqldb *sql.DB, lang string) http.Handler{
 }
 func upload() http.Handler {
 	return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request){
-	file, header, _ := req.FormFile("myFile")
-	req.ParseMultipartForm(10000000<<20)
-	defer file.Close()
-	filename := header.Filename
-	tempFile, _ :=os.CreateTemp("Data",header.Filename)
-	defer tempFile.Close()
-	fileBytes,_:=io.ReadAll(file)
-	tempFile.Write(fileBytes)
-	fn,_:=os.OpenFile("Data/"+filename, os.O_WRONLY|os.O_CREATE, 0666)
-	defer fn.Close()
-	fn.Write(fileBytes)
-	slog.Info(fmt.Sprint(getDataFromFile("Data/"+filename)))
-})}
+		file, header, err := req.FormFile("myFile")
+		if err != nil {
+			http.Error(res, "Failed to read file", http.StatusBadRequest)
+			return
+		}
+		defer file.Close()
+		req.ParseMultipartForm(10000000<<20)
+		filename := header.Filename
+		tempFile, err := os.CreateTemp("Data", header.Filename)
+		if err != nil {
+			http.Error(res, "Failed to create temp file", http.StatusInternalServerError)
+			return
+		}
+		defer tempFile.Close()
+		fileBytes, err := io.ReadAll(file)
+		if err != nil {
+			http.Error(res, "Failed to read file bytes", http.StatusInternalServerError)
+			return
+		}
+		_, err = tempFile.Write(fileBytes)
+		if err != nil {
+			http.Error(res, "Failed to write to temp file", http.StatusInternalServerError)
+			return
+		}
+		fn, err := os.OpenFile("Data/"+filename, os.O_WRONLY|os.O_CREATE, 0666)
+		if err != nil {
+			http.Error(res, "Failed to open file", http.StatusInternalServerError)
+			return
+		}
+		defer fn.Close()
+		_, err = fn.Write(fileBytes)
+		if err != nil {
+			http.Error(res, "Failed to write to file", http.StatusInternalServerError)
+			return
+		}
+		slog.Info(fmt.Sprint(getDataFromFile("Data/" + filename)))
+	})
+}
+
 
 // index creates an HTTP handler that serves the main page with data from the database.
 // sqldb: The database connection object.