Fix some minor bugs in event handling and add enter key support

common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee

@@ -5,6 +5,7 @@ class @Rubric
     $('.rubric').data("location", location) 
     $('input[class="score-selection"]').change @tracking_callback
     # set up the hotkeys
+    $(window).unbind('keydown', @keypress_callback)
     $(window).keydown @keypress_callback
     # display the 'current' carat
     @categories = $('.rubric-category')
@@ -28,7 +29,7 @@ class @Rubric
       return
 
     # if we actually have a current category (not past the end)
-    if(@category.length > 0)
+    if(@category_index <= @categories.length)
       # find the valid selections for this category
       inputs = $("input[name='score-selection-#{@category_index}']")
       max_score = inputs.length - 1
@@ -88,6 +89,7 @@ class @CombinedOpenEnded
   constructor: (element) ->
     @element=element
     @reinitialize(element)
+    $(window).keydown @keydown_handler
 
   reinitialize: (element) ->
     @wrapper=$(element).find('section.xmodule_CombinedOpenEndedModule')
@@ -358,6 +360,11 @@ class @CombinedOpenEnded
     else
       @errors_area.html(@out_of_sync_message)
 
+  keydown_handler: (e) =>
+    # only do anything when the key pressed is the 'enter' key
+    if e.which == 13 && @child_state == 'assessing' && Rubric.check_complete()
+      @save_assessment(e)
+
   save_assessment: (event) =>
     event.preventDefault()
     if @child_state == 'assessing' && Rubric.check_complete()

common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee

@@ -210,6 +210,9 @@ class @PeerGradingProblem
     @calibration_interstitial_page_button = $('.calibration-interstitial-page-button')
     @flag_student_checkbox = $('.flag-checkbox')
     @answer_unknown_checkbox = $('.answer-unknown-checkbox')
+
+    $(window).keydown @keydown_handler
+
     @collapse_question()
 
     Collapsible.setCollapsibles(@content_panel)
@@ -251,9 +254,6 @@ class @PeerGradingProblem
   fetch_submission_essay: () =>
     @backend.post('get_next_submission', {location: @location}, @render_submission)
 
-  gentle_alert: (msg) =>
-    @grading_message.fadeIn()
-    @grading_message.html("<p>" + msg + "</p>")
 
   construct_data: () ->
     data =
@@ -337,6 +337,14 @@ class @PeerGradingProblem
       @show_submit_button()
       @grade = Rubric.get_total_score()
 
+  keydown_handler: (event) =>
+    if event.which == 13 && @submit_button.is(':visible')
+      if @calibration
+        @submit_calibration_essay()
+      else
+        @submit_grade()
+
+
 
 
   ##########
@@ -473,6 +481,10 @@ class @PeerGradingProblem
     # And now hook up an event handler again
     $("input[class='score-selection']").change @graded_callback
 
+  gentle_alert: (msg) =>
+    @grading_message.fadeIn()
+    @grading_message.html("<p>" + msg + "</p>")
+
   collapse_question: () =>
     @prompt_container.slideToggle()
     @prompt_container.toggleClass('open')

lms/static/coffee/src/staff_grading/staff_grading.coffee

@@ -183,6 +183,8 @@ class @StaffGrading
 
     @breadcrumbs = $('.breadcrumbs')
 
+
+    $(window).keydown @keydown_handler
     @question_header = $('.question-header')
     @question_header.click @collapse_question
     @collapse_question()
@@ -229,6 +231,10 @@ class @StaffGrading
       @state = state_graded
       @submit_button.show()
 
+  keydown_handler: (e) =>
+    if e.which == 13 && !@list_view && Rubric.check_complete()
+      @submit_and_get_next()
+
   set_button_text: (text) =>
     @action_button.attr('value', text)