feat(a11y): provide text alternatives for interactive charts (#777) - #790
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Nanle-code merged 1 commit intoJul 29, 2026
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…ode#777) Add a reusable AccessibleChart wrapper and chartAccessibility utilities that expose a screen-reader summary and a keyboard-toggleable data table alongside Recharts visualizations, with graceful fallbacks for missing or malformed chart data. Adopted in AnalyticsChart, NetworkStats, and TransactionAnalyticsDashboard as the reference implementation, with a guide for migrating the remaining chart components.
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Summary
Recharts renders to SVG with no built-in semantics, so screen reader users got nothing from any chart and keyboard-only users had no way to reach the underlying data. This adds a reusable pattern that exposes both a text summary and a full data table alongside every chart it's applied to.
src/utils/chartAccessibility.ts— dependency-free helpers:isRenderableChartData,summarizeSeries(min/max/average/trend),describeChart(one-sentence summary),buildChartTable(headers/rows for an HTML table). All treatnull/non-array/empty/non-numeric input as a normal case, not an error.src/components/charts/AccessibleChart.tsx— wrapper component that:aria-describedby, plusaria-labelon the chart regionaria-expanded) that reveals an accessible<table>withscope="col"/scope="row"headersrole="status"message instead of the chart when data is missing, empty, or the wrong shape, instead of handing Recharts something it can't renderAnalyticsChart.jsx,NetworkStats.tsx, andTransactionAnalyticsDashboard.tsxas the reference implementation — the underlying Recharts trees are unchanged, only wrapped.CHART_ACCESSIBILITY_GUIDE.mddocuments the pattern, compatibility notes, and a migration checklist for the ~25 remaining Recharts usages across the dashboard.Test plan
npx vitest run src/utils/__tests__/chartAccessibility.test.ts src/components/charts/__tests__/AccessibleChart.test.tsx— 18 tests covering primary flow, boundary cases (single data point, empty dataset), and failure cases (non-array/null/non-numeric data) for both the utilities and the componentnpx tsc --noEmit— no new type errorsnpx eslinton all changed files — no new lint errors (only pre-existing warnings in files this PR touches)Closes #777