From 99cca0573049a50f37cb9e0e7174693c3f16943a Mon Sep 17 00:00:00 2001
From: Giulio Gratta <giulio@giuliogratta.com>
Date: Thu, 1 Oct 2015 14:23:35 -0700
Subject: [PATCH 1/2] Disable submit button on save click

---
 common/lib/xmodule/xmodule/js/src/capa/display.coffee | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/lib/xmodule/xmodule/js/src/capa/display.coffee b/common/lib/xmodule/xmodule/js/src/capa/display.coffee
index b2130efff9..36fdad083d 100644
--- a/common/lib/xmodule/xmodule/js/src/capa/display.coffee
+++ b/common/lib/xmodule/xmodule/js/src/capa/display.coffee
@@ -412,11 +412,13 @@ class @Problem
       @save_internal()
 
   save_internal: =>
+    @enableCheckButton false
     Logger.log 'problem_save', @answers
     $.postWithPrefix "#{@url}/problem_save", @answers, (response) =>
       saveMessage = response.msg
       @gentle_alert saveMessage
       @updateProgress response
+      @enableCheckButton true
 
   refreshMath: (event, element) =>
     element = event.target unless element

From bc6caea6a682781e350e49cc00dc568e639dde13 Mon Sep 17 00:00:00 2001
From: Adam Palay <adam@edx.org>
Date: Tue, 3 Nov 2015 14:01:53 -0500
Subject: [PATCH 2/2] add test for disabling check button while clicking save

---
 .../xmodule/js/spec/capa/display_spec.coffee        | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee b/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
index 690c748cde..5a3ed28ec7 100644
--- a/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
+++ b/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
@@ -538,6 +538,19 @@ describe 'Problem', ->
       runs ->
         expect(window.SR.readElts).toHaveBeenCalled()
 
+    it 'disables check button while posting', ->
+      runs ->
+        spyOn($, 'postWithPrefix').andCallFake (url, answers, callback) -> callback(success: 'OK')
+        spyOn @problem, 'enableCheckButton'
+        @problem.save()
+        expect(@problem.enableCheckButton).toHaveBeenCalledWith false
+      waitsFor (->
+        return jQuery.active == 0
+      ), "jQuery requests finished", 1000
+
+      runs ->
+        expect(@problem.enableCheckButton).toHaveBeenCalledWith true
+
   describe 'refreshMath', ->
     beforeEach ->
       @problem = new Problem($('.xblock-student_view'))