From 13b0442f75ff02ffbf03e3bdb7b0788f352da643 Mon Sep 17 00:00:00 2001
From: hpnrep6 <hpnrep6@gmail.com>
Date: Fri, 16 Jul 2021 13:42:09 -0400
Subject: [PATCH] Fix code in code demo executing twice on mobile (#5037)

* Prevent code from executing twice on touchscreens
---
 demos/code/code.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/demos/code/code.js b/demos/code/code.js
index 0c2765325..2377203a2 100644
--- a/demos/code/code.js
+++ b/demos/code/code.js
@@ -549,8 +549,14 @@ Code.initLanguage = function() {
 /**
  * Execute the user's code.
  * Just a quick and dirty eval.  Catch infinite loops.
+ * @param {Event} event Event created from listener bound to the function.
  */
-Code.runJS = function() {
+Code.runJS = function(event) {
+  // Prevent code from being executed twice on touchscreens.
+  if (event.type == 'touchend') {
+    event.preventDefault();
+  }
+
   Blockly.JavaScript.INFINITE_LOOP_TRAP = 'checkTimeout();\n';
   var timeouts = 0;
   var checkTimeout = function() {