React

@mochart/react wraps @mochart/core in React components. Config and data changes get mochart's staged animations for free — axis expansion, value change, axis contraction, and gapless stacked transitions — no extra wiring needed.

Install

npm install @mochart/react @mochart/core react react-dom

The optional stylesheet

If your app uses a global CSS reset (Tailwind's preflight, a normalize.css-style reset), also import the core package's optional stylesheet — it re-asserts the browser defaults the chart's tooltip and message overlays rely on, and never overrides the chart's own styling:

import '@mochart/core/mochart.css';

Quick start

DefaultChart is the simplest entry point — give it a raw config and a plain array-of-objects dataset:

import { DefaultChart } from '@mochart/react';

const config = {
  title: { text: 'Revenue' },
  categoryAxis: { property: 'month', type: 'string', scale: 'ordinal' },
  seriesDefaults: { renderer: 'bar' },
  series: [{ property: 'revenue', title: 'Revenue' }]
};

const data = [
  { month: 'Jan', revenue: 10 },
  { month: 'Feb', revenue: 20 }
];

export function Revenue() {
  return <DefaultChart config={config} data={data} width={640} height={400} />;
}

Chart is the lower-level component for hosts that manage config enhancement and data providers themselves:

import { enhanceConfig, ArrayOfObjectsDataProvider } from '@mochart/core';
import { Chart } from '@mochart/react';

const mochartConfig = enhanceConfig(config);
const dataProvider = new ArrayOfObjectsDataProvider(data, 'month');

<Chart mochartConfig={mochartConfig} dataProvider={dataProvider} width={640} height={400} />

Sizing

width and height are optional. The component renders a container div the chart mounts into; whichever dimension you omit tracks that div's size via ResizeObserver. Size the div with the className/style props and the chart follows it:

<Chart mochartConfig={mochartConfig} dataProvider={dataProvider} style={{ width: '100%', height: 400 }} />

The optional dataTestId prop sets a data-testid attribute on the same container div, for test selectors.

When the data changes

Config and data changes are detected by reference identity: passing the same array or object again — even after mutating it in place — leaves the chart unchanged. Update state with a new reference and the change animates as a normal data update:

const [data, setData] = useState(initialData);

// ✓ a new array — the chart animates to it
setData(current => [...current, { month: 'Mar', revenue: 30 }]);

// ✗ invisible — same array identity (and no React re-render either)
data.push({ month: 'Mar', revenue: 30 });

Idiomatic React state updates already work this way. The same rule applies to config on DefaultChart and to mochartConfig/dataProvider on Chart — pass a new object (or provider) to change them.

For hosts that do mutate data in place, the ref prop exposes a ChartRef handle with the core refresh() escape hatch — it re-reads the current config/data, re-indexing the built-in providers:

import { useRef } from 'react';
import type { ChartRef } from '@mochart/react';

const chartRef = useRef<ChartRef>(null);

<DefaultChart ref={chartRef} config={config} data={data} />;

data.push({ month: 'Mar', revenue: 30 });
chartRef.current?.refresh();

Callbacks and states

Both components accept the chart callbacks under their core names (onChartClick, onFocus, onSliceClick, …) and a placeholder prop per state. Each placeholder prop takes a React component that receives the chart state context (width, height, error, …) as props and is rendered while the chart is in that state. Both components also accept loading and error to force the loading or error state.

Placeholder components render through portals in the host tree, so they inherit the app's context providers (theme, router, i18n, …) like any other component — as in the other bindings.

Every prop, with its type and its core counterpart, is listed in Framework props.

Controlled state

Focus and legend filtering are chart-managed by default, but each piece of that state has a matching prop that takes over while it is set (not undefined): focusedCategoryIndex (-1 = none), focusedSeriesId and focusedValueAxisId (null = none), and filteredSeriesIds (a map of series id → true = filtered out). Pass back what onFocus and onSeriesFilter report to keep focus and filtering in sync across several charts (the round-trip is shown in Controlled focus and filtering); leave a prop undefined to let the chart keep managing that piece itself.

See it in action

The React demo gallery is a full application built on @mochart/react (react-router 7); its source lives in packages/mochart-demo-react.