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Frameworks & web · #chartjs
When dashboards push data every few seconds, destroying and recreating Chart.js instances hurts performance. This blog shows how to mutate data in place, call <code>.update()</code> with optional animation settings, and measure FPS for real‑time charts.
Learn how to make Chart.js v4 charts truly fluid by using the responsive and maintainAspectRatio options, handling DPI scaling, and throttling resize events.
A minimal, secure Chart.js setup that balances responsiveness, data sanitization, low‑frequency updates, and tight time‑scale bounds, with verification steps and failure‑mode analysis.
Chart.js's built-in decimation plugin renders 100k+ point line charts interactively using min-max or LTTB sampling — but only if the axis type, data format, and sorting preconditions are met.
Want real‑time data flowing across a Chart.js line chart without reinventing animation? Learn how to use the public chart.update() method, tweak animation timing, selectively refresh datasets, keep zoom levels, and avoid pitfalls like layout thrashing or hidden‑tab lag.
Learn how to add static data labels to Chart.js bar charts using a custom plugin, improving accessibility and readability with minimal overhead.
Step‑by‑step guide to create a Chart.js 4.x line chart that animates point radius, resizes responsively, and captures click events, plus a verification checklist and common pitfalls.
Chart.js 4 removes auto-registration. Import only the controllers, scales, elements, and plugins you need, register them explicitly, and let your bundler tree-shake the rest. A minimal line chart with decimation drops to ~20 kB gzipped.
Chart.js 3.x/4.x uses indexAxis: 'y' for horizontal bars, replacing the removed horizontalBar type. A minimal config, axis implications, migration notes, and a verification path.