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STV Visualizer - Previous Elections Dropdown

Summary

Successfully implemented a dropdown menu in the STV visualizer to allow users to select and view previous Icenian senate elections, replacing the demo data button.

Files Created

  1. public/stv-data/senate-elections.json - Registry of available elections with metadata
  2. public/stv-data/README.md - Instructions for managing election data files
  3. public/stv-data/2026-01-january-senate.json - Sample election data file
  4. docs/STV_ELECTIONS_FEATURE.md - Complete feature documentation

Files Modified

  1. src/pages/stv/visualize.astro
    • Removed "Load Demo Data" button
    • Added dropdown selector for elections
    • Added "Load Selected Election" button
    • Separated custom file upload section
    • Updated instructions
    • Implemented async election data loading
    • Removed demo data constant

How It Works

  1. On page load, the elections list is fetched from /public/stv-data/senate-elections.json
  2. The dropdown is populated with election names and term numbers
  3. When a user selects an election and clicks "Load Selected Election":
    • The corresponding JSON file is fetched from /stv-data/
    • The data is parsed and validated
    • The visualizer displays the election results
  4. Custom file upload remains available as a separate option

Usage

For Users

  1. Visit /stv/visualize
  2. Select an election from the dropdown menu
  3. Click "Load Selected Election"
  4. View the animated visualization

For Administrators

To add a new election:

  1. Export the RCVis JSON from the STV calculator
  2. Save it to /public/stv-data/YYYY-MM-month-senate.json
  3. Add an entry to /public/stv-data/senate-elections.json: 
    {
  "id": "2026-02-february",
  "name": "February 2026",
  "date": "2026-02-04",
  "term": 44,
  "dataUrl": "/stv-data/2026-02-february-senate.json",
  "type": "local"
}
  4. Rebuild: bun run build

Current Election Data

Currently includes metadata for 10 elections (Jan 2026 - Jun 2024). Only the January 2026 sample data file is included. Actual election data files need to be added by:

  • Re-running historical elections through the STV calculator
  • Obtaining exports from election officials
  • Manually constructing from available data

Benefits

  • Easy access to historical election results
  • No need to find and download election files
  • Consistent user experience
  • Centralized data management
  • Future-proof for adding more elections

Next Steps

To fully populate the feature:

  1. Obtain or recreate RCVis exports for past elections
  2. Add them to /public/stv-data/
  3. Verify each election displays correctly
  4. Consider adding more metadata (winners, vote counts, etc.)