From 3d337c75a6acdf6a6fe846a20c372939969286fe Mon Sep 17 00:00:00 2001
From: Dave Conway-Jones <conway@uk.ibm.com>
Date: Fri, 24 Sep 2021 17:11:59 +0100
Subject: [PATCH] revert some changes for old nodejs versions

---
 package.json |  2 +-
 worldmap.js  | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/package.json b/package.json
index 9ddd8ed..ff0e253 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "node-red-contrib-web-worldmap",
-    "version": "2.16.0",
+    "version": "2.16.1",
     "description": "A Node-RED node to provide a web page of a world map for plotting things on.",
     "dependencies": {
         "cgi": "0.3.1",
diff --git a/worldmap.js b/worldmap.js
index ac3202f..768039e 100644
--- a/worldmap.js
+++ b/worldmap.js
@@ -16,12 +16,12 @@ module.exports = function(RED) {
 
     function worldMap(node, n) {
         RED.nodes.createNode(node,n);
-        node.lat = n.lat ?? "";
-        node.lon = n.lon ?? "";
-        node.zoom = n.zoom ?? "";
+        node.lat = n.lat || "";
+        node.lon = n.lon || "";
+        node.zoom = n.zoom || "";
         node.layer = n.layer || "";
         node.cluster = n.cluster || "";
-        node.maxage = n.maxage ?? "";
+        node.maxage = n.maxage || "";
         node.showmenu = n.usermenu || "show";
         node.layers = n.layers || "show";
         node.panlock = n.panlock || "false";
@@ -281,7 +281,7 @@ module.exports = function(RED) {
         var bezierSpline = require("@turf/bezier-spline").default;
 
         var doTrack = function(msg) {
-            if (msg?.payload.hasOwnProperty("name")) {
+            if (msg.hasOwnProperty("payload") && msg.payload.hasOwnProperty("name")) {
                 var newmsg = RED.util.cloneMessage(msg);
                 if (msg.payload.deleted) {
                     if (msg.payload.name.substr(-1) === '_') {
@@ -360,7 +360,7 @@ module.exports = function(RED) {
                     node.send(newmsg);  // send the track
                 }
             }
-            if (msg?.payload?.command.hasOwnProperty("clear")) {
+            if (msg.hasOwnProperty("payload") && msg.payload.hasOwnProperty("command") && msg.payload.command.hasOwnProperty("clear")) {
                 for (var p in node.pointsarray) {
                     if (node.pointsarray.hasOwnProperty(p)) {
                         if (node.pointsarray[p][0].layer === msg.payload.command.clear) {
@@ -428,7 +428,7 @@ module.exports = function(RED) {
         }
 
         var doHull = function(msg) {
-            if (msg?.payload.hasOwnProperty("name")) {
+            if (msg.hasOwnProperty("payload") && msg.payload.hasOwnProperty("name")) {
                 var newmsg = RED.util.cloneMessage(msg);
                 newmsg.payload = {};
                 newmsg.payload[node.prop] = msg.payload[node.prop] || "unknown";