react-virtual-drag-list
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A virtual scrolling list component that can be sorted by dragging
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# react-virtual-drag-list
[](https://www.npmjs.com/package/react-virtual-drag-list) [](https://www.npmjs.com/package/react-virtual-drag-list) [](LICENSE)
A virtual scrolling list component that can be sorted by dragging
### [Live Demo](https://mfuu.github.io/react-virtual-drag-list/)
## Simple Usage
```bash
npm i react-virtual-drag-list
```
Root component:
```jsx
import VirtualList from 'react-virtual-drag-list';
function Virtual() {
const [list, setList] = useState([{id: '1', text: 'a'}, {id: '2', text: 'b'}, ...]);
const onDrop = (event) => {
// dnd complete
setList(() => event.list);
}
// use style and className as jsx used
return (
<VirtualList
className="virtual-list"
style={{ height: '500px' }}
dataKey="id"
dataSource={ list }
handle=".handle"
header={ <div className="loading">top loading...</div> }
footer={ <div className="loading">bottom loading...</div> }
onDrop={ onDrop }
>
{
(record, index, dataKey) => {
return (
<div>
<span className=".handle">{ index }</span>
{ record.text }
</div>
)
}
}
</VirtualList>
)
}
```
## Props
**Callback**
| **Emit** | **Type** | **Default** | **Description** |
| ---------- | ---------- | ----------- | --------------------------------------- |
| `onTop` | `Function` | - | Scrolling to the top of the scroller |
| `onBottom` | `Function` | - | Scrolling to the bottom of the scroller |
| `onDrag` | `Function` | - | Drag is started |
| `onDrop` | `Function` | - | Drag is complete |
**Required props**
| **Prop** | **Type** | **Default** | **Description** |
| ------------ | -------- | ----------- | --------------------------------------------------------------------- |
| `dataKey` | `String` | - | The unique identifier of each piece of data, in the form of `'a.b.c'` |
| `dataSource` | `Array` | `[]` | The data that needs to be rendered |
**Common used**
| **Prop** | **Type** | **Default** | **Description** |
| -------------- | ------------------------- | ----------- | ---------------------------------------------------------------------------------------------------------------- |
| `header` | `JSX.Element` | - | Top of list |
| `footer` | `JSX.Element` | - | Bottom of list |
| `size` | `Number` | - | Estimated height of each row. You can choose to pass it or not, it will be automatically calculated |
| `keeps` | `Number` | `30` | The number of lines rendered by the virtual scroll |
| `handle` | `String` | - | Drag handle selector within list items |
| `group` | `Object/String` | - | string: 'name' or object: `{ name: 'group', put: true/false, pull: true/false/'clone', revertDrag: true/false }` |
| `scroller` | `Document \| HTMLElement` | - | Virtual list scrolling element |
| `direction` | `vertical \| horizontal` | `vertical` | Scroll direction |
| `debounceTime` | `Number` | `0` | debounce time on scroll |
| `throttleTime` | `Number` | `0` | debounce time on scroll |
| `tableMode` | `Boolean` | `false` | display with table and tbody |
**Uncommonly used**
| **Prop** | **Type** | **Default** | **Description** |
| ------------------ | --------- | ------------------------- | --------------------------------------------------------------------------- |
| `draggable` | `String` | `.virutal-dnd-list-item` | Specifies which items inside the element should be draggable |
| `sortable` | `Boolean` | `true` | Whether the current list can be sorted by dragging |
| `lockAxis` | `x \| y` | `-` | Axis on which dragging will be locked |
| `keepOffset` | `Boolean` | `false` | When scrolling up to load data, keep the same offset as the previous scroll |
| `disabled` | `Boolean` | `false` | Disables the sortable if set to true |
| `animation` | `Number` | `150` | Drag-and-drop's animation delay |
| `autoScroll` | `Boolean` | `true` | Automatic scrolling when moving to the edge of the container |
| `scrollSpeed` | `Object` | `{ x: 10, y: 10 }` | Vertical&Horizontal scrolling speed (px) |
| `scrollThreshold` | `Number` | `55` | Threshold to trigger autoscroll |
| `delay` | `Number` | `0` | Time in milliseconds to define when the sorting should start |
| `delayOnTouchOnly` | `Boolean` | `false` | Only delay on press if user is using touch |
| `fallbackOnBody` | `Boolean` | `false` | Appends the ghost element into the document's body |
| `rootTag` | `String` | `div` | Label type for root element |
| `wrapTag` | `String` | `div` | Label type for list wrap element |
| `wrapStyle` | `Object` | `{}` | List wrapper element style |
| `wrapClass` | `String` | `''` | List wrapper element class |
| `itemClass` | `String` | `virutal-dnd-list-item` | List item element class |
| `ghostStyle` | `Object` | `{}` | The style of the mask element when dragging |
| `ghostClass` | `String` | `''` | The class of the mask element when dragging |
| `chosenClass` | `String` | `''` | Class name for the chosen item |
| `placeholderClass` | `String` | `''` | Class name for the drop placeholder |
## Methods
Use the methods exposed in the component by setting `ref`
```jsx
...
const virtualRef = useRef();
const scrollToBottom = () => {
virtualRef.current.scrollToBottom();
}
return (
<button onClick={ scrollToBottom }></button>
<virtualList
ref={ virtualRef }
...
>
{
(record) => <div>{ record.text }</div>
}
</virtualList>
)
```
| **Prop** | **Description** |
| ------------------------ | ---------------------------------------------------------- |
| `getSize(key)` | get the height of the specified item by key value |
| `getOffset()` | get the current scroll top/left |
| `getClientSize()` | Get wrapper element client viewport size (width or height) |
| `getScrollSize()` | Get all scroll size (scrollHeight or scrollWidth) |
| `scrollToTop()` | scroll to the top of the list |
| `scrollToBottom()` | scroll to the bottom of the list |
| `scrollToKey(key)` | scroll to the specified data-key |
| `scrollToIndex(index)` | scroll to the specified index value |
| `scrollToOffset(offset)` | scroll to the specified height |