Fix two bugs (OC-839)

problem_builder/answer.py

@@ -85,6 +85,23 @@ def get_model_object(self, name=None):
         )
         return answer_data
 
+    @property
+    def student_input(self):
+        if self.name:
+            return self.get_model_object().student_input
+        return ''
+
+    @XBlock.json_handler
+    def answer_value(self, data, suffix=''):
+        """ Current value of the answer, for refresh by client """
+        return {'value': self.student_input}
+
+    @XBlock.json_handler
+    def refresh_html(self, data, suffix=''):
+        """ Complete HTML view of the XBlock, for refresh by client """
+        frag = self.mentoring_view({})
+        return {'html': frag.content}
+
     def validate_field_data(self, validation, data):
         """
         Validate this block's field data.
@@ -277,12 +294,6 @@ class AnswerRecapBlock(AnswerMixin, StudioEditableXBlockMixin, XBlock):
 
     css_path = 'public/css/answer.css'
 
-    @property
-    def student_input(self):
-        if self.name:
-            return self.get_model_object().student_input
-        return ''
-
     def mentoring_view(self, context=None):
         """ Render this XBlock within a mentoring block. """
         context = context.copy() if context else {}
@@ -308,6 +319,8 @@ def mentoring_view(self, context=None):
 
         fragment = Fragment(html)
         fragment.add_css_url(self.runtime.local_resource_url(self, self.css_path))
+        fragment.add_javascript_url(self.runtime.local_resource_url(self, 'public/js/answer_recap.js'))
+        fragment.initialize_js('AnswerRecapBlock')
         return fragment
 
     def student_view(self, context=None):

problem_builder/mentoring.py

@@ -759,10 +759,16 @@ def get_content_titles(self):
         """
         By default, each Sequential block in a course ("Subsection" in Studio parlance) will
         display the display_name of each descendant in a tooltip above the content. We don't
-        want that - we only want to display the mentoring block as a whole as one item.
+        want that - we only want to display one title for this mentoring block as a whole.
         Otherwise things like "Choice (yes) (Correct)" will appear in the tooltip.
+
+        If this block has no title set, don't display any title. Then, if this is the only block
+        in the unit, the unit's title will be used. (Why isn't it always just used?)
         """
-        return [self.display_name]
+        has_explicitly_set_title = self.fields['display_name'].is_set_on(self)
+        if has_explicitly_set_title:
+            return [self.display_name]
+        return []
 
     @staticmethod
     def workbench_scenarios():

problem_builder/public/js/answer.js

@@ -11,6 +11,11 @@ function AnswerBlock(runtime, element) {
             if (completed === 'True' && this.mode === 'standard') {
                 checkmark.addClass('checkmark-correct icon-ok fa-check');
             }
+
+            // In the LMS, the HTML of multiple units can be loaded at once,
+            // and the user can flip among them. If that happens, the answer in
+            // our HTML may be out of date.
+            this.refreshAnswer();
         },
 
         submit: function() {
@@ -69,6 +74,25 @@ function AnswerBlock(runtime, element) {
                 }
             }
             return true;
+        },
+
+        refreshAnswer: function() {
+            $.ajax({
+                type: 'POST',
+                url: runtime.handlerUrl(element, 'answer_value'),
+                data: '{}',
+                dataType: 'json',
+                success: function(data) {
+                    // Update the answer to the latest, unless the user has made an edit
+                    var newAnswer = data.value;
+                    var $textarea = $(':input', element);
+                    var currentAnswer = $textarea.val();
+                    var origAnswer = $('.orig-student-answer', element).text();
+                    if (currentAnswer == origAnswer && currentAnswer != newAnswer) {
+                        $textarea.val(newAnswer);
+                    }
+                },
+            });
         }
     };
 }

problem_builder/public/js/answer_recap.js

@@ -0,0 +1,22 @@
+function AnswerRecapBlock(runtime, element) {
+    return {
+        init: function(options) {
+            // In the LMS, the HTML of multiple units can be loaded at once,
+            // and the user can flip among them. If that happens, the answer in
+            // our HTML may be out of date.
+            this.refreshAnswer();
+        },
+
+        refreshAnswer: function() {
+            $.ajax({
+                type: 'POST',
+                url: runtime.handlerUrl(element, 'refresh_html'),
+                data: '{}',
+                dataType: 'json',
+                success: function(data) {
+                    $(element).html(data.html);
+                }
+            });
+        }
+    };
+}

problem_builder/templates/html/answer_editable.html

@@ -5,5 +5,6 @@
      class="answer editable" cols="50" rows="10" name="input"
      data-min_characters="{{ self.min_characters }}"
      >{{ self.student_input }}</textarea>
+  <div style="display: none;" class="orig-student-answer">{{ self.student_input }}</div> <!-- To detect edits -->
   <span class="answer-checkmark fa icon-2x"></span>
 </div>

problem_builder/templates/html/answer_read_only.html

@@ -1,5 +1,5 @@
 {% load i18n %}
-<div class="xblock-answer" data-completed="{{ student_input|yesno:"true,false" }}">
+<div class="xblock-answer">
   {% if not hide_header %}<h3 class="question-title">{{ title }}</h3>{% endif %}
   {% if description %}<p>{{ description|safe }}</p>{% endif %}
   <blockquote class="answer read_only">

problem_builder/tests/unit/test_mentoring.py

@@ -6,6 +6,7 @@
 from problem_builder.mentoring import _default_theme_config
 
 
+@ddt.ddt
 class TestMentoringBlock(unittest.TestCase):
     def test_sends_progress_event_when_rendered_student_view_with_display_submit_false(self):
         block = MentoringBlock(MagicMock(), DictFieldData({
@@ -31,6 +32,21 @@ def test_does_not_send_progress_event_when_rendered_student_view_with_display_su
 
             self.assertFalse(patched_runtime.publish.called)
 
+    @ddt.data(True, False)
+    def test_get_content_titles(self, has_title_set):
+        """
+        Test that we don't send a title to the LMS for the sequential's tooltips when no title
+        is set
+        """
+        if has_title_set:
+            data = {'display_name': 'Custom Title'}
+            expected = ['Custom Title']
+        else:
+            data = {}
+            expected = []
+        block = MentoringBlock(MagicMock(), DictFieldData(data), Mock())
+        self.assertEqual(block.get_content_titles(), expected)
+
 
 @ddt.ddt
 class TestMentoringBlockTheming(unittest.TestCase):