# Angular Chart

```ts
import { Chart } from '@tanstack/angular-charts'
```

`Chart` is a standalone component with selector `tanstack-chart`. Its required
`options` input accepts a chart definition. Replace the definition identity
when captured application values change.
The definition also owns focus, tooltip, animation, keyboard policy, focus
distance, and spatial indexing.

## `options`

| Option               | Type                                         | Default               | Meaning                                                |
| -------------------- | -------------------------------------------- | --------------------- | ------------------------------------------------------ |
| `definition`         | `ChartDefinition`                            | Required              | Framework-neutral chart definition                     |
| `ariaLabel`          | `string`                                     | Required              | Accessible chart name                                  |
| `ariaDescription`    | `string`                                     | None                  | Optional accessible description                        |
| `height`             | `number`                                     | `320` without a ratio | Fixed CSS and scene height                             |
| `aspectRatio`        | `number`                                     | None                  | Positive width-to-height ratio when height is absent   |
| `width`              | `number`                                     | Responsive            | Fixed CSS and scene width                              |
| `initialWidth`       | `number`                                     | `640`                 | Initial and server width before responsive measurement |
| `tabIndex`           | `number`                                     | `0`                   | Surface tab index; `keyboard: false` forces `-1`       |
| `idPrefix`           | `string`                                     | Generated             | Prefix for renderer-owned document IDs                 |
| `renderSvg`          | `ChartSvgRenderer<TDatum, TXValue, TYValue>` | `renderChartSvg`      | Scene-to-SVG renderer                                  |
| `measureText`        | `ChartTextMeasurer`                          | Host measurer         | Guide text measurement                                 |
| `onFocusChange`      | `(point: ChartPoint \| null) => void`        | None                  | Primary focus callback                                 |
| `onFocusGroupChange` | `(points: readonly ChartPoint[]) => void`    | None                  | Grouped focus callback                                 |
| `onSelect`           | `(point: ChartPoint \| null) => void`        | None                  | Pointer or keyboard activation callback                |
| `onRender`           | `(context: ChartRenderContext) => void`      | None                  | Live SVG, container, and scene after rendering         |
| `class`              | `string`                                     | None                  | Extra class on the inner `.ts-chart-host`              |
| `style`              | `string`                                     | None                  | Inner host declarations applied after adapter sizing   |
| `className`          | `string`                                     | None                  | Extra class on the rendered SVG surface                |

Callbacks are functions inside `options`, not Angular outputs. Replace the
complete `options` value when chart state changes so `OnPush` change detection
delivers an `ngOnChanges` update.

## Tooltip body template

Project a typed tooltip template into the chart:

```html
<tanstack-chart [options]="chartOptions">
  <ng-template [tanstackChartTooltipBody]="chartOptions.definition" let-tooltip>
    <ng-container [ngTemplateOutlet]="tooltip.defaultBody" />
    <series-detail [points]="tooltip.points" />
    @if (tooltip.pinned) {
    <button type="button" (click)="tooltip.dismiss()">Close</button>
    }
  </ng-template>
</tanstack-chart>
```

Import `ChartTooltipBodyDirective` and Angular's `NgTemplateOutlet` beside
`Chart`. The context exposes `points`, `content`, `defaultBody`, `pinned`, and
`dismiss`; named template bindings are also available. Binding the same
definition gives Angular's strict template checker the datum and x/y value
types. Ordering, anchoring, placement, portaling, and pinning remain in the
definition.

## Exported types

`ChartCommonOptions` contains common host and presentation options.
`ChartOptions` adds the definition. `ChartPresentationOptions` contains
`class` and `style`. The package exports `ChartTooltipBodyDirective`,
`ChartTooltipBodyRenderContext`, and `ChartTooltipBodyTemplateContext`. It also
re-exports `ChartDefinition` and `ChartPoint`.

See the [Angular adapter](../adapter.md) for lifecycle and SSR behavior,
[Focus and interaction](../../../reference/focus-and-interaction.md) for
callback semantics, and [Rendering and export](../../../reference/rendering-and-export.md)
for custom SVG renderers.