bytedance-flowgram/apps/docs/src/zh/api/services/selection-service.mdx

# SelectionService

用于控制选择的节点

[> API Detail](https://flowgram.ai/auto-docs/core/classes/SelectionService.html)

## Usage
```tsx pure
// Listen Selection Change
ctx.selection.onSelectionChanged((nodes) => {
})
// Select All Nodes
ctx.selection.selection = ctx.document.getAllNodes()
```