feat: update breadcrumbs on course unit page

src/course-outline/CourseOutline.jsx

@@ -1,6 +1,4 @@
-import {
-  React, useState, useEffect,
-} from 'react';
+import { useState, useEffect } from 'react';
 import PropTypes from 'prop-types';
 import { useIntl } from '@edx/frontend-platform/i18n';
 import {
@@ -40,7 +38,9 @@ import EmptyPlaceholder from './empty-placeholder/EmptyPlaceholder';
 import PublishModal from './publish-modal/PublishModal';
 import ConfigureModal from './configure-modal/ConfigureModal';
 import DeleteModal from './delete-modal/DeleteModal';
-import { useCourseOutline } from './hooks';
+import {
+  useCourseOutline, useScrollToLocatorElement,
+} from './hooks';
 import messages from './messages';
 
 const CourseOutline = ({ courseId }) => {
@@ -88,6 +88,8 @@ const CourseOutline = ({ courseId }) => {
     handleDragNDrop,
   } = useCourseOutline({ courseId });
 
+  useScrollToLocatorElement({ isLoading });
+
   const [sections, setSections] = useState(sectionsList);
 
   const initialSections = [...sectionsList];

src/course-outline/CourseOutline.test.jsx

@@ -1,4 +1,3 @@
-import React from 'react';
 import {
   act, render, waitFor, cleanup, fireEvent, within,
 } from '@testing-library/react';
@@ -46,6 +45,8 @@ let axiosMock;
 let store;
 const mockPathname = '/foo-bar';
 const courseId = '123';
+const locatorSectionName = 'Demo Course Overview';
+const locatorSectionId = 'block-v1:edX+DemoX+Demo_Course+type@sequential+block@edx_introduction';
 
 window.HTMLElement.prototype.scrollIntoView = jest.fn();
 
@@ -54,6 +55,7 @@ jest.mock('react-router-dom', () => ({
   useLocation: () => ({
     pathname: mockPathname,
   }),
+  useSearchParams: () => [new URLSearchParams({ show: locatorSectionId })],
 }));
 
 jest.mock('../help-urls/hooks', () => ({
@@ -380,6 +382,18 @@ describe('<CourseOutline />', () => {
     expect(await findAllByTestId('section-card')).toHaveLength(5);
   });
 
+  it('check correct scrolling to the locator section when URL has a "show" param', async () => {
+    const scrollIntoViewFn = jest.fn();
+    window.HTMLElement.prototype.scrollIntoView = scrollIntoViewFn;
+    const { getByText } = render(<RootWrapper />);
+
+    await waitFor(() => {
+      expect(getByText(locatorSectionName)).toBeInTheDocument();
+      expect(scrollIntoViewFn).toHaveBeenCalled();
+      expect(scrollIntoViewFn).toHaveBeenCalledWith({ behavior: 'smooth' });
+    });
+  });
+
   it('check whether subsection is duplicated successfully', async () => {
     const { findAllByTestId } = render(<RootWrapper />);
     const section = courseOutlineIndexMock.courseStructure.childInfo.children[0];

src/course-outline/card-header/CardHeader.jsx

@@ -27,6 +27,7 @@ import messages from './messages';
 const CardHeader = ({
   title,
   status,
+  sectionId,
   hasChanges,
   isExpanded,
   onClickPublish,
@@ -58,7 +59,11 @@ const CardHeader = ({
   });
 
   return (
-    <div className="item-card-header" data-testid={`${namePrefix}-card-header`}>
+    <div
+      className="item-card-header"
+      data-locator={sectionId}
+      data-testid={`${namePrefix}-card-header`}
+    >
       {isFormOpen ? (
         <Form.Group className="m-0">
           <Form.Control
@@ -167,6 +172,7 @@ const CardHeader = ({
 CardHeader.propTypes = {
   title: PropTypes.string.isRequired,
   status: PropTypes.string.isRequired,
+  sectionId: PropTypes.string.isRequired,
   hasChanges: PropTypes.bool.isRequired,
   isExpanded: PropTypes.bool.isRequired,
   onExpand: PropTypes.func.isRequired,

src/course-outline/hooks.jsx

@@ -1,5 +1,6 @@
 import { useEffect, useState } from 'react';
 import { useDispatch, useSelector } from 'react-redux';
+import { useSearchParams } from 'react-router-dom';
 import { useToggle } from '@edx/paragon';
 
 import { RequestStatus } from '../data/constants';
@@ -211,5 +212,20 @@ const useCourseOutline = ({ courseId }) => {
   };
 };
 
-// eslint-disable-next-line import/prefer-default-export
-export { useCourseOutline };
+const useScrollToLocatorElement = ({ isLoading }) => {
+  const [searchParams] = useSearchParams();
+
+  useEffect(() => {
+    const locator = searchParams.get('show');
+    const locatorToShow = document.querySelector(`[data-locator="${locator}"]`);
+
+    if (locator && locatorToShow) {
+      locatorToShow.scrollIntoView({ behavior: 'smooth' });
+    }
+  }, [isLoading]);
+};
+
+export {
+  useCourseOutline,
+  useScrollToLocatorElement,
+};

src/course-outline/subsection-card/SubsectionCard.jsx

@@ -1,6 +1,7 @@
 import { useEffect, useState, useRef } from 'react';
 import PropTypes from 'prop-types';
 import { useDispatch } from 'react-redux';
+import { useSearchParams } from 'react-router-dom';
 import { useIntl } from '@edx/frontend-platform/i18n';
 import { Button, useToggle } from '@edx/paragon';
 import { Add as IconAdd } from '@edx/paragon/icons';
@@ -24,7 +25,10 @@ const SubsectionCard = ({
   const currentRef = useRef(null);
   const intl = useIntl();
   const dispatch = useDispatch();
-  const [isExpanded, setIsExpanded] = useState(false);
+  const [searchParams] = useSearchParams();
+  const locatorId = searchParams.get('show');
+  const isScrolledToElement = locatorId === subsection.id;
+  const [isExpanded, setIsExpanded] = useState(locatorId ? isScrolledToElement : false);
   const [isFormOpen, openForm, closeForm] = useToggle(false);
 
   const {
@@ -81,7 +85,12 @@ const SubsectionCard = ({
   }, [savingStatus]);
 
   return (
-    <div className="subsection-card" data-testid="subsection-card" ref={currentRef}>
+    <div
+      className="subsection-card"
+      data-locator={subsection.id}
+      data-testid="subsection-card"
+      ref={currentRef}
+    >
       <CardHeader
         title={displayName}
         status={subsectionStatus}

src/course-outline/subsection-card/SubsectionCard.test.jsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import { MemoryRouter } from 'react-router-dom';
 import { render, fireEvent } from '@testing-library/react';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
 import { AppProvider } from '@edx/frontend-platform/react';
@@ -38,25 +38,27 @@ const subsection = {
 
 const onEditSubectionSubmit = jest.fn();
 
-const renderComponent = (props) => render(
-  <AppProvider store={store}>
-    <IntlProvider locale="en">
-      <SubsectionCard
-        section={section}
-        subsection={subsection}
-        onOpenPublishModal={jest.fn()}
-        onOpenHighlightsModal={jest.fn()}
-        onOpenDeleteModal={jest.fn()}
-        onEditClick={jest.fn()}
-        savingStatus=""
-        onEditSubmit={onEditSubectionSubmit}
-        onDuplicateSubmit={jest.fn()}
-        namePrefix="subsection"
-        {...props}
-      >
-        <span>children</span>
-      </SubsectionCard>
-    </IntlProvider>,
+const renderComponent = (props, entry = '/') => render(
+  <AppProvider store={store} wrapWithRouter={false}>
+    <MemoryRouter initialEntries={[entry]}>
+      <IntlProvider locale="en">
+        <SubsectionCard
+          section={section}
+          subsection={subsection}
+          onOpenPublishModal={jest.fn()}
+          onOpenHighlightsModal={jest.fn()}
+          onOpenDeleteModal={jest.fn()}
+          onEditClick={jest.fn()}
+          savingStatus=""
+          onEditSubmit={onEditSubectionSubmit}
+          onDuplicateSubmit={jest.fn()}
+          namePrefix="subsection"
+          {...props}
+        >
+          <span>children</span>
+        </SubsectionCard>
+      </IntlProvider>
+    </MemoryRouter>
   </AppProvider>,
 );
 
@@ -122,4 +124,13 @@ describe('<SubsectionCard />', () => {
     fireEvent.keyDown(editField, { key: 'Enter', keyCode: 13 });
     expect(onEditSubectionSubmit).toHaveBeenCalled();
   });
+
+  it('check extended section when URL has a "show" param', async () => {
+    const { findByTestId } = renderComponent(null, `?show=${section.id}`);
+
+    const cardUnits = await findByTestId('subsection-card__units');
+    const newUnitButton = await findByTestId('new-unit-button');
+    expect(cardUnits).toBeInTheDocument();
+    expect(newUnitButton).toBeInTheDocument();
+  });
 });

src/course-unit/__mocks__/courseUnitIndex.js

@@ -912,7 +912,7 @@ module.exports = {
         },
       },
       {
-        id: 'block-v1:edX+DemoX+Demo_Course+type@chapter+block@interactive_demonstrations',
+        id: 'block-v1:edX+DemoX+Demo_Course+type@chapter+block@graded_interactions',
         display_name: 'Example Week 1: Getting Started',
         category: 'chapter',
         has_children: true,

src/course-unit/breadcrumbs/Breadcrumbs.jsx

@@ -14,14 +14,14 @@ import messages from './messages';
 const Breadcrumbs = ({ courseId }) => {
   const intl = useIntl();
   const { ancestorInfo } = useSelector(getCourseUnitData);
-  const { sectionsList } = useCourseOutline({ courseId });
+  const { sectionsList, isLoading: isLoadingCourseOutline } = useCourseOutline({ courseId });
   const activeCourseSectionInfo = sectionsList.find((block) => block.id === ancestorInfo?.ancestors[1]?.id);
 
   const breadcrumbs = {
     section: {
       id: ancestorInfo?.ancestors[1]?.id,
       displayName: ancestorInfo?.ancestors[1]?.displayName,
-      dropdownItems: sectionsList || [],
+      dropdownItems: sectionsList,
     },
     subsection: {
       id: ancestorInfo?.ancestors[0]?.id,
@@ -30,6 +30,12 @@ const Breadcrumbs = ({ courseId }) => {
     },
   };
 
+  const getLoadingPlaceholder = () => (
+    <div className="small px-3 py-2" role="status">
+      {intl.formatMessage(messages.loading)}
+    </div>
+  );
+
   return (
     <nav className="d-flex align-center mb-2.5">
       <ol className="p-0 m-0 d-flex align-center">
@@ -43,14 +49,18 @@ const Breadcrumbs = ({ courseId }) => {
               />
             </Dropdown.Toggle>
             <Dropdown.Menu>
-              {breadcrumbs.section.dropdownItems.map(({ studioUrl, displayName }) => (
-                <Dropdown.Item
-                  href={studioUrl}
-                  className="small"
-                >
-                  {displayName}
-                </Dropdown.Item>
-              ))}
+              {(isLoadingCourseOutline || !breadcrumbs.section.dropdownItems.length)
+                ? getLoadingPlaceholder()
+                : breadcrumbs.section.dropdownItems.map(({ id, studioUrl, displayName }) => (
+                  <Dropdown.Item
+                    key={id}
+                    href={studioUrl}
+                    className="small"
+                    data-testid="breadcrumbs-section-dropdown-item"
+                  >
+                    {displayName}
+                  </Dropdown.Item>
+                ))}
             </Dropdown.Menu>
           </Dropdown>
           <Icon
@@ -70,14 +80,18 @@ const Breadcrumbs = ({ courseId }) => {
               />
             </Dropdown.Toggle>
             <Dropdown.Menu>
-              {breadcrumbs.subsection.dropdownItems.map(({ studioUrl, displayName }) => (
-                <Dropdown.Item
-                  href={studioUrl}
-                  className="small"
-                >
-                  {displayName}
-                </Dropdown.Item>
-              ))}
+              {(isLoadingCourseOutline || !breadcrumbs.subsection.dropdownItems.length)
+                ? getLoadingPlaceholder()
+                : breadcrumbs.subsection.dropdownItems.map(({ id, studioUrl, displayName }) => (
+                  <Dropdown.Item
+                    key={id}
+                    href={studioUrl}
+                    className="small"
+                    data-testid="breadcrumbs-subsection-dropdown-item"
+                  >
+                    {displayName}
+                  </Dropdown.Item>
+                ))}
             </Dropdown.Menu>
           </Dropdown>
         </li>