Merge pull request #13916 from edx/mushtaq/tnl-5797-duplicate-functionality

Add duplicate functionality for unit, sub-section and section

cms/djangoapps/contentstore/views/item.py

@@ -635,7 +635,7 @@ def _create_item(request):
     )
 
 
-def _duplicate_item(parent_usage_key, duplicate_source_usage_key, user, display_name=None):
+def _duplicate_item(parent_usage_key, duplicate_source_usage_key, user, display_name=None, is_child=False):
     """
     Duplicate an existing xblock as a child of the supplied parent_usage_key.
     """
@@ -653,6 +653,10 @@ def _duplicate_item(parent_usage_key, duplicate_source_usage_key, user, display_
         for field in source_item.fields.values():
             if field.scope == Scope.settings and field.is_set_on(source_item):
                 duplicate_metadata[field.name] = field.read_from(source_item)
+
+        if is_child:
+            display_name = display_name or source_item.display_name or source_item.category
+
         if display_name is not None:
             duplicate_metadata['display_name'] = display_name
         else:
@@ -698,7 +702,7 @@ def _duplicate_item(parent_usage_key, duplicate_source_usage_key, user, display_
         if source_item.has_children and not children_handled:
             dest_module.children = dest_module.children or []
             for child in source_item.children:
-                dupe = _duplicate_item(dest_module.location, child, user=user)
+                dupe = _duplicate_item(dest_module.location, child, user=user, is_child=True)
                 if dupe not in dest_module.children:  # _duplicate_item may add the child for us.
                     dest_module.children.append(dupe)
             store.update_item(dest_module, user.id)
@@ -944,8 +948,9 @@ def create_xblock_info(xblock, data=None, metadata=None, include_ancestor_info=F
         visibility_state = None
     published = modulestore().has_published_version(xblock) if not is_library_block else None
 
-    # defining the default value 'True' for delete, drag and add new child actions in xblock_actions for each xblock.
-    xblock_actions = {'deletable': True, 'draggable': True, 'childAddable': True}
+    # defining the default value 'True' for delete, duplicate, drag and add new child actions
+    # in xblock_actions for each xblock.
+    xblock_actions = {'deletable': True, 'draggable': True, 'childAddable': True, 'duplicable': True}
     explanatory_message = None
 
     # is_entrance_exam is inherited metadata.

cms/djangoapps/contentstore/views/tests/test_item.py

@@ -484,7 +484,8 @@ class DuplicateHelper(object):
             "Duplicated item differs from original"
         )
 
-    def _check_equality(self, source_usage_key, duplicate_usage_key, parent_usage_key=None, check_asides=False):
+    def _check_equality(self, source_usage_key, duplicate_usage_key, parent_usage_key=None, check_asides=False,
+                        is_child=False):
         """
         Gets source and duplicated items from the modulestore using supplied usage keys.
         Then verifies that they represent equivalent items (modulo parents and other
@@ -523,10 +524,9 @@ class DuplicateHelper(object):
                 "Parent duplicate should be different from source"
             )
 
-        # Set the location, display name, and parent to be the same so we can make sure the rest of the
+        # Set the location and parent to be the same so we can make sure the rest of the
         # duplicate is equal.
         duplicated_item.location = original_item.location
-        duplicated_item.display_name = original_item.display_name
         duplicated_item.parent = original_item.parent
 
         # Children will also be duplicated, so for the purposes of testing equality, we will set
@@ -538,11 +538,26 @@ class DuplicateHelper(object):
                 "Duplicated item differs in number of children"
             )
             for i in xrange(len(original_item.children)):
-                if not self._check_equality(original_item.children[i], duplicated_item.children[i]):
+                if not self._check_equality(original_item.children[i], duplicated_item.children[i], is_child=True):
                     return False
             duplicated_item.children = original_item.children
+        return self._verify_duplicate_display_name(original_item, duplicated_item, is_child)
 
-        return original_item == duplicated_item
+    def _verify_duplicate_display_name(self, original_item, duplicated_item, is_child=False):
+        """
+        Verifies display name of duplicated item.
+        """
+        if is_child:
+            if original_item.display_name is None:
+                return duplicated_item.display_name == original_item.category
+            return duplicated_item.display_name == original_item.display_name
+        if original_item.display_name is not None:
+            return duplicated_item.display_name == "Duplicate of '{display_name}'".format(
+                display_name=original_item.display_name
+            )
+        return duplicated_item.display_name == "Duplicate of {display_name}".format(
+            display_name=original_item.category
+        )
 
     def _duplicate_item(self, parent_usage_key, source_usage_key, display_name=None):
         """
@@ -571,16 +586,20 @@ class TestDuplicateItem(ItemTest, DuplicateHelper):
         resp = self.create_xblock(parent_usage_key=self.usage_key, category='chapter')
         self.chapter_usage_key = self.response_usage_key(resp)
 
-        # create a sequential containing a problem and an html component
+        # create a sequential
         resp = self.create_xblock(parent_usage_key=self.chapter_usage_key, category='sequential')
         self.seq_usage_key = self.response_usage_key(resp)
 
+        # create a vertical containing a problem and an html component
+        resp = self.create_xblock(parent_usage_key=self.seq_usage_key, category='vertical')
+        self.vert_usage_key = self.response_usage_key(resp)
+
         # create problem and an html component
-        resp = self.create_xblock(parent_usage_key=self.seq_usage_key, category='problem',
+        resp = self.create_xblock(parent_usage_key=self.vert_usage_key, category='problem',
                                   boilerplate='multiplechoice.yaml')
         self.problem_usage_key = self.response_usage_key(resp)
 
-        resp = self.create_xblock(parent_usage_key=self.seq_usage_key, category='html')
+        resp = self.create_xblock(parent_usage_key=self.vert_usage_key, category='html')
         self.html_usage_key = self.response_usage_key(resp)
 
         # Create a second sequential just (testing children of children)
@@ -591,8 +610,9 @@ class TestDuplicateItem(ItemTest, DuplicateHelper):
         Tests that a duplicated xblock is identical to the original,
         except for location and display name.
         """
-        self._duplicate_and_verify(self.problem_usage_key, self.seq_usage_key)
-        self._duplicate_and_verify(self.html_usage_key, self.seq_usage_key)
+        self._duplicate_and_verify(self.problem_usage_key, self.vert_usage_key)
+        self._duplicate_and_verify(self.html_usage_key, self.vert_usage_key)
+        self._duplicate_and_verify(self.vert_usage_key, self.seq_usage_key)
         self._duplicate_and_verify(self.seq_usage_key, self.chapter_usage_key)
         self._duplicate_and_verify(self.chapter_usage_key, self.usage_key)
 
@@ -625,9 +645,10 @@ class TestDuplicateItem(ItemTest, DuplicateHelper):
                     "duplicated item not ordered after source item"
                 )
 
-        verify_order(self.problem_usage_key, self.seq_usage_key, 0)
+        verify_order(self.problem_usage_key, self.vert_usage_key, 0)
         # 2 because duplicate of problem should be located before.
-        verify_order(self.html_usage_key, self.seq_usage_key, 2)
+        verify_order(self.html_usage_key, self.vert_usage_key, 2)
+        verify_order(self.vert_usage_key, self.seq_usage_key, 0)
         verify_order(self.seq_usage_key, self.chapter_usage_key, 0)
 
         # Test duplicating something into a location that is not the parent of the original item.
@@ -645,12 +666,12 @@ class TestDuplicateItem(ItemTest, DuplicateHelper):
             return usage_key
 
         # Display name comes from template.
-        dupe_usage_key = verify_name(self.problem_usage_key, self.seq_usage_key, "Duplicate of 'Multiple Choice'")
+        dupe_usage_key = verify_name(self.problem_usage_key, self.vert_usage_key, "Duplicate of 'Multiple Choice'")
         # Test dupe of dupe.
-        verify_name(dupe_usage_key, self.seq_usage_key, "Duplicate of 'Duplicate of 'Multiple Choice''")
+        verify_name(dupe_usage_key, self.vert_usage_key, "Duplicate of 'Duplicate of 'Multiple Choice''")
 
         # Uses default display_name of 'Text' from HTML component.
-        verify_name(self.html_usage_key, self.seq_usage_key, "Duplicate of 'Text'")
+        verify_name(self.html_usage_key, self.vert_usage_key, "Duplicate of 'Text'")
 
         # The sequence does not have a display_name set, so category is shown.
         verify_name(self.seq_usage_key, self.chapter_usage_key, "Duplicate of sequential")

cms/static/js/models/xblock_info.js

@@ -196,6 +196,10 @@ function(Backbone, _, str, ModuleUtils) {
             return this.isActionRequired('deletable');
         },
 
+        isDuplicable: function() {
+            return this.isActionRequired('duplicable');
+        },
+
         isDraggable: function() {
             return this.isActionRequired('draggable');
         },

cms/static/js/spec/views/pages/course_outline_spec.js

@@ -400,6 +400,70 @@ define(['jquery', 'edx-ui-toolkit/js/utils/spec-helpers/ajax-helpers', 'common/j
                 });
             });
 
+            describe('Duplicate an xblock', function() {
+                var duplicateXBlockWithSuccess;
+
+                duplicateXBlockWithSuccess = function(xblockLocator, parentLocator, xblockType, xblockIndex) {
+                    getItemHeaders(xblockType).find('.duplicate-button')[xblockIndex].click();
+
+                    // verify content of request
+                    AjaxHelpers.expectJsonRequest(requests, 'POST', '/xblock/', {
+                        duplicate_source_locator: xblockLocator,
+                        parent_locator: parentLocator
+                    });
+
+                    // send the response
+                    AjaxHelpers.respondWithJson(requests, {
+                        locator: 'locator-duplicated-xblock'
+                    });
+                };
+
+                it('section can be duplicated', function() {
+                    createCourseOutlinePage(this, mockCourseJSON);
+                    expect(outlinePage.$('.list-sections li.outline-section').length).toEqual(1);
+                    expect(getItemsOfType('section').length, 1);
+                    duplicateXBlockWithSuccess('mock-section', 'mock-course', 'section', 0);
+                    expect(getItemHeaders('section').length, 2);
+                });
+
+                it('subsection can be duplicated', function() {
+                    createCourseOutlinePage(this, mockCourseJSON);
+                    expect(getItemsOfType('subsection').length, 1);
+                    duplicateXBlockWithSuccess('mock-subsection', 'mock-section', 'subsection', 0);
+                    expect(getItemHeaders('subsection').length, 2);
+                });
+
+                it('unit can be duplicated', function() {
+                    createCourseOutlinePage(this, mockCourseJSON);
+                    expandItemsAndVerifyState('subsection');
+                    expect(getItemsOfType('unit').length, 1);
+                    duplicateXBlockWithSuccess('mock-unit', 'mock-subsection', 'unit', 0);
+                    expect(getItemHeaders('unit').length, 2);
+                });
+
+                it('shows a notification when duplicating', function() {
+                    var notificationSpy = EditHelpers.createNotificationSpy();
+                    createCourseOutlinePage(this, mockCourseJSON);
+                    getItemHeaders('section').find('.duplicate-button').first()
+                        .click();
+                    EditHelpers.verifyNotificationShowing(notificationSpy, /Duplicating/);
+                    AjaxHelpers.respondWithJson(requests, {locator: 'locator-duplicated-xblock'});
+                    EditHelpers.verifyNotificationHidden(notificationSpy);
+                });
+
+                it('does not duplicate an xblock upon failure', function() {
+                    var notificationSpy = EditHelpers.createNotificationSpy();
+                    createCourseOutlinePage(this, mockCourseJSON);
+                    expect(getItemHeaders('section').length, 1);
+                    getItemHeaders('section').find('.duplicate-button').first()
+                        .click();
+                    EditHelpers.verifyNotificationShowing(notificationSpy, /Duplicating/);
+                    AjaxHelpers.respondWithError(requests);
+                    expect(getItemHeaders('section').length, 2);
+                    EditHelpers.verifyNotificationShowing(notificationSpy, /Duplicating/);
+                });
+            });
+
             describe('Empty course', function() {
                 it('shows an empty course message initially', function() {
                     createCourseOutlinePage(this, mockEmptyCourseJSON);

cms/static/js/views/course_outline.js

@@ -91,9 +91,28 @@ define(['jquery', 'underscore', 'js/views/xblock_outline', 'common/js/components
                 }
             },
 
-            onSectionAdded: function(locator) {
+            /**
+             * Perform specific actions for duplicated xblock.
+             * @param {String}  locator  The locator of the new duplicated xblock.
+             * @param {String}  xblockType The front-end terminology of the xblock category.
+             * @param {jquery Element}  xblockElement  The xblock element to be duplicated.
+             */
+            onChildDuplicated: function(locator, xblockType, xblockElement) {
+                var scrollOffset = ViewUtils.getScrollOffset(xblockElement);
+                if (xblockType === 'section') {
+                    this.onSectionAdded(locator, xblockElement, scrollOffset);
+                } else {
+                    // For all other block types, refresh the view and do the following:
+                    //  - show the new block expanded
+                    //  - ensure it is scrolled into view
+                    //  - make its name editable
+                    this.refresh(this.createNewItemViewState(locator, scrollOffset));
+                }
+            },
+
+            onSectionAdded: function(locator, xblockElement, scrollOffset) {
                 var self = this,
-                    initialState = self.createNewItemViewState(locator),
+                    initialState = self.createNewItemViewState(locator, scrollOffset),
                     sectionInfo, sectionView;
                 // For new chapters in a non-empty view, add a new child view and render it
                 // to avoid the expense of refreshing the entire page.
@@ -108,7 +127,7 @@ define(['jquery', 'underscore', 'js/views/xblock_outline', 'common/js/components
                         sectionView.initialState = initialState;
                         sectionView.expandedLocators = self.expandedLocators;
                         sectionView.render();
-                        self.addChildView(sectionView);
+                        self.addChildView(sectionView, xblockElement);
                         sectionView.setViewState(initialState);
                     });
                 } else {

cms/static/js/views/pages/container.js

@@ -209,10 +209,12 @@ define(['jquery', 'underscore', 'gettext', 'js/views/pages/base_page', 'common/j
                     buttonPanel = target.closest('.add-xblock-component'),
                     listPanel = buttonPanel.prev(),
                     scrollOffset = ViewUtils.getScrollOffset(buttonPanel),
-                    placeholderElement = this.createPlaceholderElement().appendTo(listPanel),
+                    $placeholderEl = $(this.createPlaceholderElement()),
                     requestData = _.extend(template, {
                         parent_locator: parentLocator
-                    });
+                    }),
+                    placeholderElement;
+                placeholderElement = $placeholderEl.appendTo(listPanel);
                 return $.postJSON(this.getURLRoot() + '/', requestData,
                     _.bind(this.onNewXBlock, this, placeholderElement, scrollOffset, false))
                     .fail(function() {
@@ -226,22 +228,19 @@ define(['jquery', 'underscore', 'gettext', 'js/views/pages/base_page', 'common/j
                 // and then onNewXBlock will replace it with a rendering of the xblock. Note that
                 // for xblocks that can't be replaced inline, the entire parent will be refreshed.
                 var self = this,
-                    parent = xblockElement.parent();
-                ViewUtils.runOperationShowingMessage(gettext('Duplicating'),
-                    function() {
-                        var scrollOffset = ViewUtils.getScrollOffset(xblockElement),
-                            placeholderElement = self.createPlaceholderElement().insertAfter(xblockElement),
-                            parentElement = self.findXBlockElement(parent),
-                            requestData = {
-                                duplicate_source_locator: xblockElement.data('locator'),
-                                parent_locator: parentElement.data('locator')
-                            };
-                        return $.postJSON(self.getURLRoot() + '/', requestData,
-                            _.bind(self.onNewXBlock, self, placeholderElement, scrollOffset, true))
-                            .fail(function() {
-                                // Remove the placeholder if the update failed
-                                placeholderElement.remove();
-                            });
+                    parentElement = self.findXBlockElement(xblockElement.parent()),
+                    scrollOffset = ViewUtils.getScrollOffset(xblockElement),
+                    $placeholderEl = $(self.createPlaceholderElement()),
+                    placeholderElement;
+
+                placeholderElement = $placeholderEl.insertAfter(xblockElement);
+                XBlockUtils.duplicateXBlock(xblockElement, parentElement)
+                    .done(function(data) {
+                        self.onNewXBlock(placeholderElement, scrollOffset, true, data);
+                    })
+                    .fail(function() {
+                        // Remove the placeholder if the update failed
+                        placeholderElement.remove();
                     });
             },
 
@@ -319,7 +318,7 @@ define(['jquery', 'underscore', 'gettext', 'js/views/pages/base_page', 'common/j
                     updateHtml: function(element, html) {
                         // Replace the element with the new HTML content, rather than adding
                         // it as child elements.
-                        this.$el = $(html).replaceAll(element);
+                        this.$el = $(html).replaceAll(element); // safe-lint: disable=javascript-jquery-insertion
                     }
                 });
                 temporaryView = new TemporaryXBlockView({

cms/static/js/views/utils/xblock_utils.js

 /**
  * Provides utilities for views to work with xblocks.
  */
-define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_utils', 'js/utils/module'],
-    function($, _, gettext, ViewUtils, ModuleUtils) {
-        var addXBlock, deleteXBlock, createUpdateRequestData, updateXBlockField, VisibilityState,
-            getXBlockVisibilityClass, getXBlockListTypeClass, updateXBlockFields;
+define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_utils', 'js/utils/module',
+        'edx-ui-toolkit/js/utils/string-utils'],
+    function($, _, gettext, ViewUtils, ModuleUtils, StringUtils) {
+        'use strict';
+        var addXBlock, duplicateXBlock, deleteXBlock, createUpdateRequestData, updateXBlockField, VisibilityState,
+            getXBlockVisibilityClass, getXBlockListTypeClass, updateXBlockFields, getXBlockType;
 
         /**
          * Represents the possible visibility states for an xblock:
@@ -66,6 +68,30 @@ define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_util
         };
 
         /**
+         * Duplicates the specified xblock element in its parent xblock.
+         * @param {jquery Element}  xblockElement  The xblock element to be duplicated.
+         * @param {jquery Element}  parentElement  Parent element of the xblock element to be duplicated,
+         *      new duplicated xblock would be placed under this xblock.
+         * @returns {jQuery promise} A promise representing the duplication of the xblock.
+         */
+        duplicateXBlock = function(xblockElement, parentElement) {
+            return ViewUtils.runOperationShowingMessage(gettext('Duplicating'),
+                function() {
+                    var duplicationOperation = $.Deferred();
+                    $.postJSON(ModuleUtils.getUpdateUrl(), {
+                        duplicate_source_locator: xblockElement.data('locator'),
+                        parent_locator: parentElement.data('locator')
+                    }, function(data) {
+                        duplicationOperation.resolve(data);
+                    })
+                    .fail(function() {
+                        duplicationOperation.reject();
+                    });
+                    return duplicationOperation.promise();
+                });
+        };
+
+        /**
          * Deletes the specified xblock.
          * @param xblockInfo The model for the xblock to be deleted.
          * @param xblockType A string representing the type of the xblock to be deleted.
@@ -87,9 +113,9 @@ define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_util
                     );
                 },
                 messageBody;
-            xblockType = xblockType || 'component';
-            messageBody = interpolate(
-                    gettext('Deleting this %(xblock_type)s is permanent and cannot be undone.'),
+            xblockType = xblockType || 'component'; // eslint-disable-line no-param-reassign
+            messageBody = StringUtils.interpolate(
+                    gettext('Deleting this {xblock_type} is permanent and cannot be undone.'),
                     {xblock_type: xblockType},
                     true
                 );
@@ -97,14 +123,14 @@ define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_util
             if (xblockInfo.get('is_prereq')) {
                 messageBody += ' ' + gettext('Any content that has listed this content as a prerequisite will also have access limitations removed.');   // eslint-disable-line max-len
                 ViewUtils.confirmThenRunOperation(
-                    interpolate(
-                        gettext('Delete this %(xblock_type)s (and prerequisite)?'),
+                    StringUtils.interpolate(
+                        gettext('Delete this {xblock_type} (and prerequisite)?'),
                         {xblock_type: xblockType},
                         true
                     ),
                     messageBody,
-                    interpolate(
-                        gettext('Yes, delete this %(xblock_type)s'),
+                    StringUtils.interpolate(
+                        gettext('Yes, delete this {xblock_type}'),
                         {xblock_type: xblockType},
                         true
                     ),
@@ -112,14 +138,14 @@ define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_util
                 );
             } else {
                 ViewUtils.confirmThenRunOperation(
-                    interpolate(
-                        gettext('Delete this %(xblock_type)s?'),
+                    StringUtils.interpolate(
+                        gettext('Delete this {xblock_type}?'),
                         {xblock_type: xblockType},
                         true
                     ),
                     messageBody,
-                    interpolate(
-                        gettext('Yes, delete this %(xblock_type)s'),
+                    StringUtils.interpolate(
+                        gettext('Yes, delete this {xblock_type}'),
                         {xblock_type: xblockType},
                         true
                     ),
@@ -217,6 +243,7 @@ define(['jquery', 'underscore', 'gettext', 'common/js/components/utils/view_util
         return {
             'VisibilityState': VisibilityState,
             'addXBlock': addXBlock,
+            duplicateXBlock: duplicateXBlock,
             'deleteXBlock': deleteXBlock,
             'updateXBlockField': updateXBlockField,
             'getXBlockVisibilityClass': getXBlockVisibilityClass,

cms/static/js/views/xblock_outline.js

@@ -14,8 +14,10 @@
  *  - edit_display_name - true if the shown xblock's display name should be in inline edit mode
  */
 define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/components/utils/view_utils',
-        'js/views/utils/xblock_utils', 'js/views/xblock_string_field_editor'],
-    function($, _, gettext, BaseView, ViewUtils, XBlockViewUtils, XBlockStringFieldEditor) {
+        'js/views/utils/xblock_utils', 'js/views/xblock_string_field_editor',
+        'edx-ui-toolkit/js/utils/string-utils', 'edx-ui-toolkit/js/utils/html-utils'],
+    function($, _, gettext, BaseView, ViewUtils, XBlockViewUtils, XBlockStringFieldEditor, StringUtils, HtmlUtils) {
+        'use strict';
         var XBlockOutlineView = BaseView.extend({
             // takes XBlockInfo as a model
 
@@ -68,7 +70,10 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
                 if (this.parentInfo) {
                     this.setElement($(html));
                 } else {
-                    this.$el.html(html);
+                    HtmlUtils.setHtml(
+                        this.$el,
+                        HtmlUtils.HTML(html)
+                    );
                 }
             },
 
@@ -83,7 +88,7 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
                     defaultNewChildName = null,
                     isCollapsed = this.shouldRenderChildren() && !this.shouldExpandChildren();
                 if (childInfo) {
-                    addChildName = interpolate(gettext('New %(component_type)s'), {
+                    addChildName = StringUtils.interpolate(gettext('New {component_type}'), {
                         component_type: childInfo.display_name
                     }, true);
                     defaultNewChildName = childInfo.display_name;
@@ -126,8 +131,12 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
                 return this.$('> .outline-content > ol');
             },
 
-            addChildView: function(childView) {
-                this.getListElement().append(childView.$el);
+            addChildView: function(childView, xblockElement) {
+                if (xblockElement) {
+                    childView.$el.insertAfter(xblockElement);
+                } else {
+                    this.getListElement().append(childView.$el);
+                }
             },
 
             addNameEditor: function() {
@@ -186,6 +195,7 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
             addButtonActions: function(element) {
                 var self = this;
                 element.find('.delete-button').click(_.bind(this.handleDeleteEvent, this));
+                element.find('.duplicate-button').click(_.bind(this.handleDuplicateEvent, this));
                 element.find('.button-new').click(_.bind(this.handleAddEvent, this));
             },
 
@@ -281,9 +291,9 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
 
             handleDeleteEvent: function(event) {
                 var self = this,
-                    parentView = this.parentView;
+                    parentView = this.parentView,
+                    xblockType = XBlockViewUtils.getXBlockType(this.model.get('category'), parentView.model, true);
                 event.preventDefault();
-                var xblockType = XBlockViewUtils.getXBlockType(this.model.get('category'), parentView.model, true);
                 XBlockViewUtils.deleteXBlock(this.model, xblockType).done(function() {
                     if (parentView) {
                         parentView.onChildDeleted(self, event);
@@ -291,12 +301,50 @@ define(['jquery', 'underscore', 'gettext', 'js/views/baseview', 'common/js/compo
                 });
             },
 
+            /**
+             * Finds appropriate parent element for an xblock element.
+             * @param {jquery Element}  xblockElement  The xblock element to be duplicated.
+             * @param {String}  xblockType The front-end terminology of the xblock category.
+             * @returns {jquery Element} Appropriate parent element of xblock element.
+             */
+            getParentElement: function(xblockElement, xblockType) {
+                var xblockMap = {
+                        unit: 'subsection',
+                        subsection: 'section',
+                        section: 'course'
+                    },
+                    parentXblockType = xblockMap[xblockType];
+                return xblockElement.closest('.outline-' + parentXblockType);
+            },
+
+            /**
+             * Duplicate event handler.
+             */
+            handleDuplicateEvent: function(event) {
+                var self = this,
+                    xblockType = XBlockViewUtils.getXBlockType(self.model.get('category'), self.parentView.model, true),
+                    xblockElement = $(event.currentTarget).closest('.outline-item'),
+                    parentElement = self.getParentElement(xblockElement, xblockType);
+
+                event.preventDefault();
+                XBlockViewUtils.duplicateXBlock(xblockElement, parentElement)
+                    .done(function(data) {
+                        if (self.parentView) {
+                            self.parentView.onChildDuplicated(
+                                data.locator,
+                                xblockType,
+                                xblockElement
+                            );
+                        }
+                    });
+            },
+
             handleAddEvent: function(event) {
                 var self = this,
-                    target = $(event.currentTarget),
-                    category = target.data('category');
+                    $target = $(event.currentTarget),
+                    category = $target.data('category');
                 event.preventDefault();
-                XBlockViewUtils.addXBlock(target).done(function(locator) {
+                XBlockViewUtils.addXBlock($target).done(function(locator) {
                     self.onChildAdded(locator, category, event);
                 });
             }

cms/templates/js/course-outline.underscore

@@ -112,6 +112,14 @@ if (is_proctored_exam) {
                         </a>
                     </li>
                 <% } %>
+                <% if (xblockInfo.isDuplicable()) { %>
+                    <li class="action-item action-duplicate">
+                        <a href="#" data-tooltip="<%- gettext('Duplicate') %>" class="duplicate-button action-button">
+                            <span class="icon fa fa-copy" aria-hidden="true"></span>
+                            <span class="sr action-button-text"><%- gettext('Duplicate') %></span>
+                        </a>
+                    </li>
+                <% } %>
                 <% if (xblockInfo.isDeletable()) { %>
                     <li class="action-item action-delete">
                         <a href="#" data-tooltip="<%- gettext('Delete') %>" class="delete-button action-button">

cms/templates/js/mock/mock-course-outline-page.underscore

@@ -38,7 +38,7 @@
         <section class="content">
             <article class="content-primary" role="main">
                 <div class="wrapper-dnd">
-                    <article class="outline" data-locator="mock-course" data-course-key="slashes:MockCourse">
+                    <article class="outline outline-course" data-locator="mock-course" data-course-key="slashes:MockCourse">
                         <div class="no-content add-xblock-component">
                             <p>You haven't added any content to this course yet.
                                 <a href="#" class="button button-new" data-category="chapter" data-parent="mock-course" data-default-name="Section" title="Click to add a new section">