npm package: @saritasa/react-sortable-tree
Description: Drag-and-drop sortable component for nested data and hierarchies
Latest version: 2.2.1

<div align="center">
  <img src="https://cloud.githubusercontent.com/assets/4413963/18860410/26f64de8-84b8-11e6-9284-350308eed30a.png"/>
</div>

# React Sortable Tree

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> A React component for Drag-and-drop sortable representation of hierarchical data. Checkout the [demo](https://react-sortable-tree.surge.sh/) for a demonstration of some basic features. Checkout the [storybook](https://frontend-collective.github.io/react-sortable-tree/storybook/index.html) for advanced usage. Play with the code on [CodeSandbox.io](https://codesandbox.io/s/wkxvy3z15w).

<div align="center">
  <img src="https://cloud.githubusercontent.com/assets/4413963/19334888/2be8261c-913a-11e6-9508-4b347ae114b4.gif"/>
</div>

## Getting started

Install `react-sortable-tree` using npm.

```sh
npm install react-sortable-tree --save
```

ES6 and CommonJS builds are available with each distribution.
For example:

```js
// This only needs to be done once; probably during your application's bootstrapping process.
import 'react-sortable-tree/style.css';

// You can import the default tree with dnd context
import SortableTree from 'react-sortable-tree';

// Or you can import the tree without the dnd context as a named export. eg
import { SortableTreeWithoutDndContext as SortableTree } from 'react-sortable-tree';

// Importing from esm (default)
import SortableTree from 'react-sortable-tree/dist/index.esm.js';

// Importing from cjs
import SortableTree from 'react-sortable-tree/dist/index.cjs.js';
```

## Usage

```jsx
import React, { Component } from 'react';
import SortableTree from 'react-sortable-tree';
import 'react-sortable-tree/style.css'; // This only needs to be imported once in your app

export default class Tree extends Component {
  constructor(props) {
    super(props);

    this.state = {
      treeData: [{ title: 'Chicken', children: [{ title: 'Egg' }] }],
    };
  }

  render() {
    return (
      <div style={{ height: 400 }}>
        <SortableTree
          treeData={this.state.treeData}
          onChange={treeData => this.setState({ treeData })}
        />
      </div>
    );
  }
}
```

## Options

| Prop                           |      Type      | <div style="width: 400px;">Description</div>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| :----------------------------- | :------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| treeData<br/>_(required)_      |    object[]    | Tree data with the following keys: <div>`title` is the primary label for the node.</div><div>`subtitle` is a secondary label for the node.</div><div>`expanded` shows children of the node if true, or hides them if false. Defaults to false.</div><div>`children` is an array of child nodes belonging to the node.</div><div>**Example**: `[{title: 'main', subtitle: 'sub'}, { title: 'value2', expanded: true, children: [{ title: 'value3') }] }]`                                                                                                                                                                                           |
| onChange<br/>_(required)_      |      func      | Called whenever tree data changed. Just like with React input elements, you have to update your own component's data to see the changes reflected.<div>`( treeData: object[] ): void`</div>                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| getNodeKey<br/>_(recommended)_ |      func      | Specify the unique key used to identify each node and generate the `path` array passed in callbacks. With a setting of `getNodeKey={({ node }) => node.id}`, for example, in callbacks this will let you easily determine that the node with an `id` of `35` is (or has just become) a child of the node with an `id` of `12`, which is a child of ... and so on. It uses [`defaultGetNodeKey`](https://github.com/frontend-collective/react-sortable-tree/blob/master/src/utils/default-handlers.js) by default, which returns the index in the tree (omitting hidden nodes).<div>`({ node: object, treeIndex: number }): string or number`</div> |
| generateNodeProps              |      func      | Generate an object with additional props to be passed to the node renderer. Use this for adding buttons via the `buttons` key, or additional `style` / `className` settings.<div>`({ node: object, path: number[] or string[], treeIndex: number, lowerSiblingCounts: number[], isSearchMatch: bool, isSearchFocus: bool }): object`</div>                                                                                                                                                                                                                                                                                                         |
| onMoveNode                     |      func      | Called after node move operation. <div>`({ treeData: object[], node: object, nextParentNode: object, prevPath: number[] or string[], prevTreeIndex: number, nextPath: number[] or string[], nextTreeIndex: number }): void`</div>                                                                                                                                                                                                                                                                                                                                                                                                                  |
| onVisibilityToggle             |      func      | Called after children nodes collapsed or expanded. <div>`({ treeData: object[], node: object, expanded: bool, path: number[] or string[] }): void`</div>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| onDragStateChanged             |      func      | Called when a drag is initiated or ended. <div>`({ isDragging: bool, draggedNode: object }): void`</div>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| maxDepth                       |     number     | Maximum depth nodes can be inserted at. Defaults to infinite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| rowDirection                   |     string     | Adds row direction support if set to `'rtl'` Defaults to `'ltr'`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| canDrag                        |  func or bool  | Return false from callback to prevent node from dragging, by hiding the drag handle. Set prop to `false` to disable dragging on all nodes. Defaults to `true`. <div>`({ node: object, path: number[] or string[], treeIndex: number, lowerSiblingCounts: number[], isSearchMatch: bool, isSearchFocus: bool }): bool`</div>                                                                                                                                                                                                                                                                                                                        |
| canDrop                        |      func      | Return false to prevent node from dropping in the given location. <div>`({ node: object, prevPath: number[] or string[], prevParent: object, prevTreeIndex: number, nextPath: number[] or string[], nextParent: object, nextTreeIndex: number }): bool`</div>                                                                                                                                                                                                                                                                                                                                                                                      |
| theme                          |     object     | Set an all-in-one packaged appearance for the tree. See the [Themes](#themes) section for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| searchMethod                   |      func      | The method used to search nodes. Defaults to [`defaultSearchMethod`](https://github.com/frontend-collective/react-sortable-tree/blob/master/src/utils/default-handlers.js), which uses the `searchQuery` string to search for nodes with matching `title` or `subtitle` values. NOTE: Changing `searchMethod` will not update the search, but changing the `searchQuery` will.<div>`({ node: object, path: number[] or string[], treeIndex: number, searchQuery: any }): bool`</div>                                                                                                                                                               |
| searchQuery                    | string or any  | Used by the `searchMethod` to highlight and scroll to matched nodes. Should be a string for the default `searchMethod`, but can be anything when using a custom search. Defaults to `null`.                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| searchFocusOffset              |     number     | Outline the <`searchFocusOffset`>th node and scroll to it.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| expandOnlySearchedNodes        |    boolean     | Only expand the nodes that match searches. Collapses all other nodes. Defaults to `false`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| searchFinishCallback           |      func      | Get the nodes that match the search criteria. Used for counting total matches, etc.<div>`(matches: { node: object, path: number[] or string[], treeIndex: number }[]): void`</div>                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| dndType                        |     string     | String value used by [react-dnd](http://react-dnd.github.io/react-dnd/docs-overview.html) (see overview at the link) for dropTargets and dragSources types. If not set explicitly, a default value is applied by react-sortable-tree for you for its internal use. **NOTE:** Must be explicitly set and the same value used in order for correct functioning of external nodes                                                                                                                                                                                                                                                                     |
| shouldCopyOnOutsideDrop        |  func or bool  | Return true, or a callback returning true, and dropping nodes to react-dnd drop targets outside of the tree will not remove them from the tree. Defaults to `false`. <div>`({ node: object, prevPath: number[] or string[], prevTreeIndex: number, }): bool`</div>                                                                                                                                                                                                                                                                                                                                                                                 |
| reactVirtualizedListProps      |     object     | Custom properties to hand to the internal [react-virtualized List](https://github.com/bvaughn/react-virtualized/blob/master/docs/List.md#prop-types)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| style                          |     object     | Style applied to the container wrapping the tree (style defaults to `{height: '100%'}`)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| innerStyle                     |     object     | Style applied to the inner, scrollable container (for padding, etc.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| className                      |     string     | Class name for the container wrapping the tree                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| rowHeight                      | number or func | Used by react-sortable-tree. Defaults to `62`. Either a fixed row height (number) or a function that returns the height of a row given its index: `({ treeIndex: number, node: object, path: number[] or string[] }): number`                                                                                                                                                                                                                                                                                                                                                                                                                      |
| slideRegionSize                |     number     | Size in px of the region near the edges that initiates scrolling on dragover. Defaults to `100`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| scaffoldBlockPxWidth           |     number     | The width of the blocks containing the lines representing the structure of the tree. Defaults to `44`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| isVirtualized                  |      bool      | Set to false to disable virtualization. Defaults to `true`. **NOTE**: Auto-scrolling while dragging, and scrolling to the `searchFocusOffset` will be disabled.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| nodeContentRenderer            |      any       | Override the default component ([`NodeRendererDefault`](https://github.com/frontend-collective/react-sortable-tree/blob/master/src/node-renderer-default.js)) for rendering nodes (but keep the scaffolding generator). This is a last resort for customization - most custom styling should be able to be solved with `generateNodeProps`, a `theme` or CSS rules. If you must use it, is best to copy the component in `node-renderer-default.js` to use as a base, and customize as needed.                                                                                                                                                     |
| placeholderRenderer            |      any       | Override the default placeholder component ([`PlaceholderRendererDefault`](https://github.com/frontend-collective/react-sortable-tree/blob/master/src/placeholder-renderer-default.js)) which is displayed when the tree is empty. This is an advanced option, and in most cases should probably be solved with a `theme` or custom CSS instead.                                                                                                                                                                                                                                                                                                   |

## Data Helper Functions

Need a hand turning your flat data into nested tree data?
Want to perform add/remove operations on the tree data without creating your own recursive function?
Check out the helper functions exported from [`tree-data-utils.js`](https://github.com/frontend-collective/react-sortable-tree/blob/master/src/utils/tree-data-utils.js).

Notable among the available functions:

- **`getTreeFromFlatData`**: Convert flat data (like that from a database) into nested tree data
- **`getFlatDataFromTree`**: Convert tree data back to flat data
- **`addNodeUnderParent`**: Add a node under the parent node at the given path
- **`removeNode`**: For a given path, get the node at that path and the treeData with that node removed.
- **`changeNodeAtPath`**: Modify the node object at the given path
- **`map`**: Perform a change on every node in the tree
- **`walk`**: Visit every node in the tree in order

Documentation for each method is only available in the code at this time. You can also refer to the tests for simple usage examples.
If your hobbies happen to include writing documentation, by all means submit a pull request. It would really help out.

## Themes

Using the `theme` prop along with an imported theme module, you can easily override the default appearance with another standard one.

### Featured themes

|                       ![File Explorer Theme](https://user-images.githubusercontent.com/4413963/32144502-1df1ae08-bcfd-11e7-8f63-8b836dace1a4.png)                        |           <img alt="Full Node Drag Theme" src="https://user-images.githubusercontent.com/4413963/33521792-61dc2c50-d81f-11e7-8ab1-359661a11ca4.png" width="300">           |  <img alt="MINIMAL THEME" src="https://github.com/lifejuggler/react-sortable-tree-theme-minimal/blob/master/example-resource/main.png" width="300">  |
| :----------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :--------------------------------------------------------------------------------------------------------------------------------------------------: |
|                                                                            **File Explorer**                                                                             |                                                                             **Full Node Drag**                                                                             |                                                   **Minimalistic theme inspired from MATERIAL UI**                                                   |
|                                                                 react-sortable-tree-theme-file-explorer                                                                  |                                                                  react-sortable-tree-theme-full-node-drag                                                                  |                                                          react-sortable-tree-theme-minimal                                                           |
| [Github](https://github.com/frontend-collective/react-sortable-tree-theme-file-explorer) \| [NPM](https://www.npmjs.com/package/react-sortable-tree-theme-file-explorer) | [Github](https://github.com/frontend-collective/react-sortable-tree-theme-full-node-drag) \| [NPM](https://www.npmjs.com/package/react-sortable-tree-theme-full-node-drag) | [Github](https://github.com/lifejuggler/react-sortable-tree-theme-minimal) \| [NPM](https://www.npmjs.com/package/react-sortable-tree-theme-minimal) |

**Help Wanted** - As the themes feature has just been enabled, there are very few (only _two_ at the time of this writing) theme modules available. If you've customized the appearance of your tree to be especially cool or easy to use, I would be happy to feature it in this readme with a link to the Github repo and NPM page if you convert it to a theme. You can use my [file explorer theme repo](https://github.com/frontend-collective/react-sortable-tree-theme-file-explorer) as a template to plug in your own stuff.

## Browser Compatibility

| Browser | Works? |
| :------ | :----- |
| Chrome  | Yes    |
| Firefox | Yes    |
| Safari  | Yes    |
| IE 11   | Yes    |

## Troubleshooting

### If it throws "TypeError: fn is not a function" errors in production

This issue may be related to an ongoing incompatibility between UglifyJS and Webpack's behavior. See an explanation at [create-react-app#2376](https://github.com/facebookincubator/create-react-app/issues/2376).

The simplest way to mitigate this issue is by adding `comparisons: false` to your Uglify config as seen here: https://github.com/facebookincubator/create-react-app/pull/2379/files

### If it doesn't work with other components that use react-dnd

react-dnd only allows for one DragDropContext at a time (see: https://github.com/gaearon/react-dnd/issues/186). To get around this, you can import the context-less tree component via `SortableTreeWithoutDndContext`.

```js
// before
import SortableTree from 'react-sortable-tree';

// after
import { SortableTreeWithoutDndContext as SortableTree } from 'react-sortable-tree';
```

## Contributing

Please read the [Code of Conduct](CODE_OF_CONDUCT.md).

After cloning the repository and running `npm install` inside, you can use the following commands to develop and build the project.

```sh
# Starts a webpack dev server that hosts a demo page with the component.
# It uses react-hot-loader so changes are reflected on save.
npm start

# Start the storybook, which has several different examples to play with.
# Also hot-reloaded.
npm run storybook

# Runs the library tests
npm test

# Lints the code with eslint
npm run lint

# Lints and builds the code, placing the result in the dist directory.
# This build is necessary to reflect changes if you're
#  `npm link`-ed to this repository from another local project.
npm run build
```

Pull requests are welcome!

## License

MIT