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A Morden React Tree component library with virtualization, search, and Tailwind CSS support.

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# RsTree

[![npm version](https://img.shields.io/npm/v/rstree-ui.svg)](https://www.npmjs.com/package/rstree-ui)
[![Build Status](https://github.com/fireangle/rstree/workflows/CI/badge.svg)](https://github.com/fireangle/rstree/actions)
[![TypeScript](https://img.shields.io/badge/%3C%2F%3E-TypeScript-%230074c1.svg)](http://www.typescriptlang.org/)
[![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/fireangle/rstree/main/LICENSE)

A Morden React tree component library with virtualization, search, and Tailwind CSS support. [Demo](https://rstree.pages.dev)

**Another choice for React tree components.**
![Tree component screenshot](https://raw.githubusercontent.com/fireangle/rstree/main/docs/basic-tree.png)

## Features

- **Virtual scrolling** for large datasets (1000+ nodes)
- **Fuzzy search** with highlighting and auto-expansion 
- **Full customization** of icons and nodes
- **Responsive design** for all screen sizes
- **TypeScript support** with complete type definitions
- **Multiple selection modes** - single/multi-select, checkboxes, disabled states
- **Tailwind CSS integration** - works with or without Tailwind
- **Tree utilities** - connecting lines, click-to-toggle, auto-expand

## Installation

```bash
npm install rstree-ui
```

### Peer Dependencies

```bash
npm install react react-dom
```

### Tailwind CSS Support (Optional)

Works with Tailwind CSS v3+ and v4+, or as a standalone component.

## Quick Start

### Option 1: With Tailwind CSS v4

Add to your CSS file:

```css
@import "tailwindcss";
@source "../node_modules/rstree-ui";
```

### Option 2: With Tailwind CSS v3

Add the library path to your `tailwind.config.js`:

```js
module.exports = {
  content: [
    "./src/**/*.{js,ts,jsx,tsx}",
    "./node_modules/rstree-ui/**/*.{js,ts,jsx,tsx}",
  ],
  // ... other config
}
```

### Option 3: Standalone CSS

Import the pre-compiled styles:

```js
import 'rstree-ui/style.css'
```

### Basic Usage

```jsx
import { RsTree } from 'rstree-ui'

const data = [
  {
    id: '1',
    label: 'Documents',
    children: [
      { id: '1-1', label: 'Resume.pdf' },
      { id: '1-2', label: 'Cover Letter.docx' }
    ]
  },
  { id: '2', label: 'Pictures' }
]

function App() {
  const [selectedIds, setSelectedIds] = useState([])
  
  return (
    <RsTree 
      data={data}
      selectedIds={selectedIds}
      onSelect={setSelectedIds}
      showIcons={true}
    />
  )
}
```

## API Reference

### RsTree Props

#### Core Props

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `data` | `TreeNode[]` | **required** | Tree data structure |
| `selectedIds` | `string[]` | `[]` | Array of selected node IDs |
| `onSelect` | `(ids: string[]) => void` | - | Selection change callback |
| `multiSelect` | `boolean` | `false` | Enable multi-selection |

#### Expansion Control

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `expandedIds` | `string[]` | `[]` | Array of expanded node IDs |
| `onExpand` | `(ids: string[]) => void` | - | Expansion change callback |
| `clickToToggle` | `boolean` | `false` | Click anywhere on node to toggle |

#### Checkbox Support

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `checkable` | `boolean` | `false` | Enable checkboxes |
| `checkedIds` | `string[]` | `[]` | Array of checked node IDs |
| `onCheck` | `(ids: string[]) => void` | - | Check state change callback |

#### Visual Customization

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `showIcons` | `boolean` | `true` | Show folder/file icons |
| `showTreeLines` | `boolean` | `false` | Show connecting lines |
| `disabled` | `boolean` | `false` | Disable all interactions |
| `className` | `string` | `''` | Additional CSS classes for container |
| `treeLineClassName` | `string` | `''` | Custom CSS classes for tree lines |
| `treeNodeClassName` | `string` | `''` | Custom CSS classes for tree nodes |

#### Custom Icons

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `expandIcon` | `React.ReactNode` | `<ChevronRight />` | Custom expand icon |
| `collapseIcon` | `React.ReactNode` | `<ChevronDown />` | Custom collapse icon |
| `folderIcon` | `React.ReactNode` | `<Folder />` | Custom folder icon |
| `fileIcon` | `React.ReactNode` | `<File />` | Custom file icon |

#### Search Features

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `searchTerm` | `string` | `''` | Search query string |
| `autoExpandSearch` | `boolean` | `true` | Auto-expand search results |
| `onSearchMatch` | `(id: string \| null) => void` | - | Best match callback |

#### Performance & Layout

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `virtualizeEnabled` | `boolean` | `true` | Enable virtual scrolling |
| `height` | `number` | `400` | Fixed height in pixels |
| `itemHeight` | `number` | `32` | Height per item |
| `autoHeight` | `boolean` | `false` | Auto-adjust height |
| `maxHeight` | `number` | `400` | Maximum height |
| `minHeight` | `number` | `100` | Minimum height |

#### Advanced Customization

| Prop | Type | Description |
|------|------|-------------|
| `renderNode` | `(node: TreeNode, props: TreeNodeRenderProps) => React.ReactNode` | Custom node renderer |
| `onNodeClick` | `(node: TreeNode, event: React.MouseEvent) => void` | Node click handler |

### TreeNode Interface

```typescript
interface TreeNode {
  id: string              // Unique identifier
  label: string           // Display text
  children?: TreeNode[]   // Child nodes
  disabled?: boolean      // Disable this node
  icon?: React.ComponentType<{ className?: string }> | ReactNode  // Custom icon for this node
  metadata?: Record<string, unknown>  // Additional metadata
  data?: any             // Additional custom data
}
```

## Examples

### Multi-Select Tree

```jsx
<RsTree
  data={data}
  multiSelect={true}
  selectedIds={selectedIds}
  onSelect={setSelectedIds}
/>
```

### Checkable Tree

```jsx
<RsTree
  data={data}
  checkable={true}
  checkedIds={checkedIds}
  onCheck={setCheckedIds}
/>
```

### Search with Auto-Expand

```jsx
<RsTree
  data={data}
  searchTerm={searchTerm}
  autoExpandSearch={true}
  virtualizeEnabled={true}
/>
```

### Custom Icons

```jsx
const MyExpandIcon = <span>▶</span>
const MyCollapseIcon = <span>▼</span>

<RsTree
  data={data}
  expandIcon={MyExpandIcon}
  collapseIcon={MyCollapseIcon}
  showIcons={true}
/>
```

### Large Dataset with Virtualization

```jsx
<RsTree
  data={largeDataset}
  height={500}
  virtualizeEnabled={true}
  itemHeight={36}
/>
```

### Custom Styling

```jsx
// Custom tree lines and node styling
<RsTree
  data={data}
  showTreeLines={true}
  treeLineClassName="border-blue-300 border-dashed"
  treeNodeClassName="rounded-lg shadow-sm hover:shadow-md"
  className="border border-gray-200 rounded-md"
/>

// Dark theme styling example
<RsTree
  data={data}
  showTreeLines={true}
  treeLineClassName="border-gray-600"
  treeNodeClassName="text-gray-100 hover:bg-gray-800 bg-gray-900"
  className="bg-gray-900 border border-gray-700"
/>
```

### Custom Node Renderer

The library automatically handles layout structure (indentation, tree lines, expand icons, checkboxes) while allowing you to customize the content area:

```jsx
// Rich project management tree with custom metadata
const projectData = [
  {
    id: "project-1",
    label: "React Dashboard",
    data: { 
      type: "project", 
      status: "active", 
      priority: "high", 
      lastModified: "2 hours ago" 
    },
    children: [
      { 
        id: "src", 
        label: "src", 
        data: { type: "folder", fileCount: 12, size: "298 KB" }
      },
      { 
        id: "app.tsx", 
        label: "App.tsx", 
        data: { type: "file", language: "typescript", size: "12.5 KB", lines: 340 }
      },
    ]
  }
];

<RsTree
  data={projectData}
  renderNode={customRenderer}
  showTreeLines={true}
  multiSelect={true}
/>
```

**Key Features:**
- ✅ **Automatic Layout**: Indentation, tree lines, and controls are handled automatically
- ✅ **Rich Content**: Display badges, icons, metadata, and custom styling
- ✅ **Responsive Design**: Content adapts to available space with proper text truncation
- ✅ **Interaction Support**: Maintain full tree functionality (select, expand, check)

**Note**: Your custom content is automatically wrapped in the standard tree layout structure, so you don't need to handle indentation, tree lines, or control elements yourself. Just focus on the node content.

## Development

### Install Dependencies

```bash
npm install
```

### Development

```bash
npm run dev    # Watch mode
npm run build  # Build library
npm run test   # Run tests
npm run lint   # Lint code
```

### Build

```bash
npm run build
```

## Testing

```bash
npm run test
```

## Contributing

Contributions are welcome!

1. Fork the repository
2. Create your feature branch
3. Commit your changes
4. Push to the branch
5. Open a Pull Request

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

## Support

- ⭐ Star this repository if you find it useful
- 🐛 [Report bugs](https://github.com/username/rstree/issues)
- 💡 [Request features](https://github.com/username/rstree/issues)

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