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school_compare/nextjs-app
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fix(analytics): the funnel source read a referrer that never changes
The staging E2E gate has been red since #132 merged (run 1064, and
1066 after it): "a school reached from a location page is attributed
to it, not to direct" expects `place`, receives `direct`.

#132 fixed a real bug — `/schools/` had no case and fell through to
`direct` — but the mechanism underneath it never worked.
getNavigationSource read document.referrer, which the browser writes
only when a *document* loads. Every internal navigation here is an App
Router soft navigation: history.pushState, no new document, so
document.referrer goes on naming whatever opened the tab for the whole
session.

Verified on staging: load /schools/brentwood, click a school, the URL
becomes /school/… and document.referrer is still "".

So `from` reported `direct` for essentially every in-app journey, not
just the ones through the location layer — search, rankings, compare
and detail were all being counted as "typed the URL". The unit suite
passed throughout because every case set document.referrer directly,
which only happens on a full page load.

The fix is a module-level trail written by RouteTrail, a render-nothing
client component in the root layout. Its lifetime is exactly right: it
survives soft navigation, and it dies on a real document load — which
is precisely when document.referrer becomes meaningful again, so the
two cover each other with no overlap.

Reading it skips entries equal to the current path rather than taking
the second-to-last. That makes the answer independent of whether the
layout effect or the page effect ran first — React orders those by
tree position, which is not a contract worth resting a measurement on
— and it gives the right answer both when the user returns to a page
they came from and on a hard load of a school page.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FuPUioHpxtaiDNagQvjxyM
2026-08-27 09:22:37 +01:00
..

SchoolCompare Next.js Application

Modern Next.js application for comparing primary school KS2 performance across England.

Features

  • Server-Side Rendering (SSR): Fast initial page loads with pre-rendered content
  • Individual School Pages: Dedicated pages for each school with full SEO optimization
  • Side-by-Side Comparison: Compare up to 5 schools simultaneously
  • School Rankings: Top-performing schools by various metrics
  • Interactive Maps: Leaflet integration for geographic visualization
  • Performance Charts: Chart.js visualizations for historical data
  • Responsive Design: Mobile-first approach with full responsive support
  • SEO Optimized: Dynamic sitemaps, meta tags, and structured data

Tech Stack

  • Framework: Next.js 16 (App Router)
  • Language: TypeScript 5
  • Styling: CSS Modules + CSS Variables
  • State Management: React Context API + URL state
  • Data Fetching: SWR (client-side) + Next.js fetch (server-side)
  • Charts: Chart.js + react-chartjs-2
  • Maps: Leaflet + react-leaflet
  • Testing: Jest + React Testing Library
  • Validation: Zod

Getting Started

Prerequisites

  • Node.js 24+ (using nvm recommended)
  • FastAPI backend running on port 8000

Installation

# Install dependencies
npm install

# Copy environment variables
cp .env.example .env.local

# Update .env.local with your configuration

Development

# Start development server
npm run dev

# Open http://localhost:3000

Building

# Build for production
npm run build

# Start production server
npm start

Testing

# Run tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

Linting

# Run ESLint
npm run lint

Project Structure

nextjs-app/
├── app/                      # App Router pages
│   ├── layout.tsx           # Root layout
│   ├── page.tsx             # Home page
│   ├── compare/             # Compare page
│   ├── rankings/            # Rankings page
│   ├── school/[urn]/        # Individual school pages
│   ├── sitemap.ts           # Dynamic sitemap
│   └── robots.ts            # Robots.txt
├── components/              # React components
│   ├── SchoolCard.tsx       # School card component
│   ├── FilterBar.tsx        # Search/filter controls
│   ├── ComparisonView.tsx   # Comparison interface
│   ├── RankingsView.tsx     # Rankings table
│   └── ...
├── lib/                     # Utility libraries
│   ├── api.ts              # API client
│   ├── types.ts            # TypeScript types
│   └── utils.ts            # Helper functions
├── hooks/                   # Custom React hooks
├── context/                 # React Context providers
├── styles/                  # Global styles
├── public/                  # Static assets
└── __tests__/              # Test files

Environment Variables

Variable Description Default
NEXT_PUBLIC_API_URL Public API endpoint (client-side) http://localhost:8000/api
FASTAPI_URL Server-side API endpoint http://localhost:8000/api
NODE_ENV Environment mode development

Performance Optimizations

  • Server-Side Rendering: Initial HTML rendered on server
  • Static Generation: Where possible, pages are pre-generated
  • Image Optimization: Next.js Image component with AVIF/WebP support
  • Code Splitting: Automatic route-based code splitting
  • Dynamic Imports: Heavy components loaded on demand
  • API Caching: Configurable revalidation for data fetching
  • Bundle Optimization: Tree shaking and minification
  • Compression: Gzip compression enabled

SEO Features

  • Dynamic Meta Tags: Generated per page with Next.js Metadata API
  • Open Graph: Social media optimization
  • JSON-LD: Structured data for search engines
  • Sitemap: Auto-generated from database
  • Robots.txt: Search engine crawling rules
  • Canonical URLs: Duplicate content prevention

Browser Support

  • Chrome (latest)
  • Firefox (latest)
  • Safari (latest)
  • Edge (latest)

License

Proprietary - SchoolCompare

Support

For issues and questions, please contact the development team.