From fa362c724d9cbfd002166cf20f6b4c3ee1f4c4ca Mon Sep 17 00:00:00 2001
From: Javan Makhmali <javan@javan.us>
Date: Sun, 23 Aug 2015 17:57:09 -0400
Subject: Immediately reconnect when visibilityState changes to "visible"

---
 lib/assets/javascripts/cable/connection_monitor.js.coffee | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'lib/assets')

diff --git a/lib/assets/javascripts/cable/connection_monitor.js.coffee b/lib/assets/javascripts/cable/connection_monitor.js.coffee
index cac65d9043..5573ea5a77 100644
--- a/lib/assets/javascripts/cable/connection_monitor.js.coffee
+++ b/lib/assets/javascripts/cable/connection_monitor.js.coffee
@@ -30,9 +30,11 @@ class Cable.ConnectionMonitor
     delete @stoppedAt
     @startedAt = now()
     @poll()
+    document.addEventListener("visibilitychange", @visibilityDidChange)
 
   stop: ->
     @stoppedAt = now()
+    document.removeEventListener("visibilitychange", @visibilityDidChange)
 
   poll: ->
     setTimeout =>
@@ -57,6 +59,13 @@ class Cable.ConnectionMonitor
     else
       secondsSince(@startedAt) > @staleThreshold.startedAt
 
+  visibilityDidChange: =>
+    if document.visibilityState is "visible"
+      setTimeout =>
+        if @connectionIsStale() or not @consumer.connection.isOpen()
+          @consumer.connection.reopen()
+      , 200
+
   toJSON: ->
     interval = @getInterval()
     connectionIsStale = @connectionIsStale()
-- 
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