From eb50628da1852afa5a1586f88bcd1e01a3e63468 Mon Sep 17 00:00:00 2001
From: Matthew Petroff <matthew@mpetroff.net>
Date: Fri, 25 Mar 2022 20:41:20 -0400
Subject: [PATCH] Stop loading panorama is viewer is destroyed (fixed #1084).

If the viewer is destroyed, we now try to abort loading equirectangular and
cube map panoramas. This appears to work in Chrome but not in Firefox.

No attempt is made to stop loading multires images, since that process is more
complicated.
---
 src/js/pannellum.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/js/pannellum.js b/src/js/pannellum.js
index 1657e61..b80af51 100644
--- a/src/js/pannellum.js
+++ b/src/js/pannellum.js
@@ -71,6 +71,7 @@ var config,
     eps = 1e-6,
     resizeObserver,
     hotspotsCreated = false,
+    xhr,
     destroyed = false;
 
 var defaultConfig = {
@@ -411,7 +412,7 @@ function init() {
                 onImageLoad();
             };
             
-            var xhr = new XMLHttpRequest();
+            xhr = new XMLHttpRequest();
             xhr.onloadend = function() {
                 if (xhr.status != 200) {
                     // Display error if image can't be loaded
@@ -419,6 +420,7 @@ function init() {
                     a.href = p;
                     a.textContent = a.href;
                     anError(config.strings.fileAccessError.replace('%s', a.outerHTML));
+                    return;
                 }
                 var img = this.response;
                 parseGPanoXMP(img, p);
@@ -3347,6 +3349,12 @@ this.destroy = function() {
     destroyed = true;
     clearTimeout(autoRotateStart);
 
+    if (xhr)
+        xhr.abort();
+    if (Array.isArray(panoImage)) {
+        for (var i = 0; i < 6; i++)
+            panoImage[i].src = '';
+    }
     if (renderer)
         renderer.destroy();
     if (listenersAdded) {