From e2e64ac01da38147278f832406fa480fb9dfab1f Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Tue, 17 Sep 2019 10:08:58 +0200
Subject: [PATCH] Event selector: Prevent race conditions

---
 src/pretix/static/pretixcontrol/js/ui/typeahead.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/pretix/static/pretixcontrol/js/ui/typeahead.js b/src/pretix/static/pretixcontrol/js/ui/typeahead.js
index 584fc53836..1e10f53ca5 100644
--- a/src/pretix/static/pretixcontrol/js/ui/typeahead.js
+++ b/src/pretix/static/pretixcontrol/js/ui/typeahead.js
@@ -11,6 +11,7 @@ $(function () {
         var $container = $(this);
         var $query = $(this).find('[data-typeahead-query]').length ? $(this).find('[data-typeahead-query]') : $($(this).attr("data-typeahead-field"));
         $container.find("li:not(.query-holder)").remove();
+        var lastQuery = "";
 
         $query.on("change", function () {
             if ($container.attr("data-typeahead-field") && $query.val() === "") {
@@ -18,9 +19,15 @@ $(function () {
                 $container.find("li:not(.query-holder)").remove();
                 return;
             }
+            lastQuery = $query.val();
+            var thisQuery = $query.val();
             $.getJSON(
                 $container.attr("data-source") + "?query=" + encodeURIComponent($query.val()) + (typeof $container.attr("data-organizer") !== "undefined" ? "&organizer=" + $container.attr("data-organizer") : ""),
                 function (data) {
+                    if (thisQuery !== lastQuery) {
+                        // Lost race condition
+                        return;
+                    }
                     $container.find("li:not(.query-holder)").remove();
                     $.each(data.results, function (i, res) {
                         if (res.type === "organizer") {