From 09d63d38ab7fd5804650b5a04e818d22906af71b Mon Sep 17 00:00:00 2001
From: hristoterezov <hristo@jitsi.org>
Date: Wed, 18 Jan 2017 13:24:30 -0600
Subject: [PATCH] fix(iframe_api): prevents multiple execution of listeners per
 event

---
 modules/API/external/external_api.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/API/external/external_api.js b/modules/API/external/external_api.js
index bfd84930f..9535131ee 100644
--- a/modules/API/external/external_api.js
+++ b/modules/API/external/external_api.js
@@ -173,6 +173,9 @@ function JitsiMeetExternalAPI(domain, room_name, width, height, parentNode,
 
     this.eventHandlers = {};
 
+    // Map<{string} event_name, {boolean} postis_listener_added>
+    this.postisListeners = {};
+
     this.numberOfParticipants = 1;
     this._setupListeners();
 
@@ -328,12 +331,14 @@ JitsiMeetExternalAPI.prototype.addEventListener = function(event, listener) {
     }
     // We cannot remove listeners from postis that's why we are handling the
     // callback that way.
-    if(!(event in this.eventHandlers))
+    if(!this.postisListeners[event]) {
         this.postis.listen(events[event], function(data) {
             if((event in this.eventHandlers) &&
                 typeof this.eventHandlers[event] === "function")
                 this.eventHandlers[event].call(null, data);
         }.bind(this));
+        this.postisListeners[event] = true;
+    }
     this.eventHandlers[event] = listener;
     changeEventStatus(this.postis, event, true);
 };