From 2da9c20c08be3103c66bc05775b95430b301c3a7 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Thu, 20 Jan 2022 11:49:59 -0500
Subject: [PATCH] Add ajaxQueue

---
 web/js/ajaxQueue.js | 48 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 web/js/ajaxQueue.js

diff --git a/web/js/ajaxQueue.js b/web/js/ajaxQueue.js
new file mode 100644
index 000000000..c706fb978
--- /dev/null
+++ b/web/js/ajaxQueue.js
@@ -0,0 +1,48 @@
+// See https://github.com/gnarf/jquery-ajaxQueue for license and copyright
+
+(function($) {
+
+// jQuery on an empty object, we are going to use this as our Queue
+var ajaxQueue = $({});
+
+$.ajaxQueue = function( ajaxOpts ) {
+    var jqXHR,
+        dfd = $.Deferred(),
+        promise = dfd.promise();
+
+    // run the actual query
+    function doRequest( next ) {
+        jqXHR = $.ajax( ajaxOpts );
+        jqXHR.done( dfd.resolve )
+            .fail( dfd.reject )
+            .then( next, next );
+    }
+
+    // queue our ajax request
+    ajaxQueue.queue( doRequest );
+
+    // add the abort method
+    promise.abort = function( statusText ) {
+
+        // proxy abort to the jqXHR if it is active
+        if ( jqXHR ) {
+            return jqXHR.abort( statusText );
+        }
+
+        // if there wasn't already a jqXHR we need to remove from queue
+        var queue = ajaxQueue.queue(),
+            index = $.inArray( doRequest, queue );
+
+        if ( index > -1 ) {
+            queue.splice( index, 1 );
+        }
+
+        // and then reject the deferred
+        dfd.rejectWith( ajaxOpts.context || ajaxOpts, [ promise, statusText, "" ] );
+        return promise;
+    };
+
+    return promise;
+};
+
+})(jQuery);