---
phase: 04-heatmap-interaction
plan: 01
subsystem: ui
tags: [d3, heatmap, click-navigation, project-filter, typescript, esbuild]

requires:
  - phase: 03-heatmap-rendering
    provides: d3 heatmap SVG rendering, esbuild bundle, Twig widget template
provides:
  - Click-through navigation from heatmap cells to Kimai timesheet filtered by date
  - Project filter dropdown that re-fetches and re-renders heatmap
  - getUserProjects service method for querying user project list
affects: [04-02-PLAN, polish]

tech-stack:
  added: []
  patterns: [onCellClick callback pattern for cell interaction, flex wrapper layout for widget + sidebar controls]

key-files:
  created: []
  modified:
    - Service/HeatmapService.php
    - Widget/HeatmapWidget.php
    - Resources/views/widget/heatmap.html.twig
    - assets/src/heatmap.ts
    - assets/src/types.ts
    - Resources/public/heatmap.css
    - Resources/public/heatmap.js

key-decisions:
  - "Render project filter only when user has tracked projects (skip empty dropdown)"
  - "Use encodeURIComponent for daterange param in navigation URL (T-04-03 mitigation)"

patterns-established:
  - "Callback injection: renderHeatmap accepts optional onCellClick for cell interaction"
  - "Flex wrapper: heatmap-wrapper div with heatmap-svg-area + heatmap-filter side by side"

requirements-completed: [HEAT-07, INTR-01]

duration: 2min
completed: 2026-04-08
---

# Phase 4 Plan 1: Click Navigation & Project Filter Summary

**Click-through day cell navigation to Kimai timesheet with daterange filter, plus project filter dropdown that re-fetches and re-renders the heatmap in place**

## Performance

- **Duration:** 2 min
- **Started:** 2026-04-08T13:29:12Z
- **Completed:** 2026-04-08T13:31:15Z
- **Tasks:** 2
- **Files modified:** 7

## Accomplishments
- Heatmap cells navigate to Kimai timesheet filtered by clicked date via window.location.href
- Project filter dropdown renders with Tabler form-select classes, re-fetches data on change
- CSS provides cursor:pointer hover affordance and flex layout for heatmap + filter
- All 20 existing Vitest tests still pass

## Task Commits

Each task was committed atomically:

1. **Task 1: Backend -- getUserProjects, widget getData, Twig data attributes** - `3df754e` (feat)
2. **Task 2: Frontend -- click navigation, filter dropdown, CSS, esbuild rebuild** - `b57eb93` (feat)

## Files Created/Modified
- `Service/HeatmapService.php` - Added getUserProjects() returning distinct projects user has tracked time for
- `Widget/HeatmapWidget.php` - Removed final, injected HeatmapService, getData() returns project list
- `Resources/views/widget/heatmap.html.twig` - Added data-projects and data-timesheet-url attributes
- `assets/src/types.ts` - Added ProjectOption interface
- `assets/src/heatmap.ts` - Refactored init() with click handler, project filter dropdown, re-fetch logic
- `Resources/public/heatmap.css` - Added click affordance styles and flex wrapper layout
- `Resources/public/heatmap.js` - Rebuilt bundle with all frontend changes

## Decisions Made
- Render project filter only when user has tracked projects (avoids empty dropdown)
- Use encodeURIComponent for daterange param per T-04-03 threat mitigation

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Click navigation and project filter are functional
- Ready for 04-02 (tests for interaction features)

---
*Phase: 04-heatmap-interaction*
*Completed: 2026-04-08*