@codemotion/react-tiny-virtual-list
v1.1.1
Published
A tiny but mighty list virtualization component, with zero dependencies 💪
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react-tiny-virtual-list
A tiny but mighty list virtualization library, with zero dependencies 💪
- Tiny & dependency free – Only 3kb gzipped
- Render millions of items, without breaking a sweat
- Scroll to index or set the initial scroll offset
- Supports fixed or variable heights/widths
- Vertical or Horizontal lists
Check out the demo for some examples.
Getting Started
Using npm:
npm install react-tiny-virtual-list --save
ES6, CommonJS, and UMD builds are available with each distribution. For example:
import VirtualList from 'react-tiny-virtual-list';
You can also use a global-friendly UMD build:
<script src="react-tiny-virtual-list/umd/react-tiny-virtual-list.js"></script>
<script>
var VirtualList = window.VirtualList;
...
</script>
Example usage
import React from 'react';
import {render} from 'react-dom';
import VirtualList from 'react-tiny-virtual-list';
const data = ['A', 'B', 'C', 'D', 'E', 'F', ...];
render(
<VirtualList
width='100%'
height={600}
itemCount={data.length}
itemSize={50} // Also supports variable heights (array or function getter)
renderItem={({index, style}) =>
<div key={index} style={style}> // The style property contains the item's absolute position
Letter: {data[index]}, Row: #{index}
</div>
}
/>,
document.getElementById('root')
);
Prop Types
| Property | Type | Required? | Description |
|:------------------|:------------------|:----------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| width | Number or String* | ✓ | Width of List. This property will determine the number of rendered items when scrollDirection is 'horizontal'
. |
| height | Number or String* | ✓ | Height of List. This property will determine the number of rendered items when scrollDirection is 'vertical'
. |
| itemCount | Number | ✓ | The number of items you want to render |
| renderItem | Function | ✓ | Responsible for rendering an item given it's index: ({index: number, style: Object}): React.PropTypes.node
. The returned element must handle key and style. |
| itemSize | | ✓ | Either a fixed height/width (depending on the scrollDirection), an array containing the heights of all the items in your list, or a function that returns the height of an item given its index: (index: number): number
|
| scrollDirection | String | | Whether the list should scroll vertically or horizontally. One of 'vertical'
(default) or 'horizontal'
. |
| scrollOffset | Number | | Can be used to control the scroll offset; Also useful for setting an initial scroll offset |
| overscanCount | Number | | Number of extra buffer items to render above/below the visible items. Tweaking this can help reduce scroll flickering on certain browsers/devices. |
| onScroll | Function | | Callback invoked whenever the scroll offset changes within the inner scrollable region. It has the following signature: (scrollTop: number, event: React.UIEvent<HTMLDivElement>)
. |
* Width may only be a string when scrollDirection
is 'vertical'
. Similarly, Height may only be a string if scrollDirection
is 'horizontal'
Public Methods
recomputeSizes (index: number)
This method force recomputes the item sizes after the specified index (these are normally cached).
VirtualList
has no way of knowing when its underlying data has changed, since it only receives a itemSize property. If the itemSize is a number
, this isn't an issue, as it can compare before and after values and automatically call recomputeSizes
internally.
However, if you're passing a function to itemSize
, that type of comparison is error prone. In that event, you'll need to call recomputeSizes
manually to inform the VirtualList
that the size of its items has changed.
Reporting Issues
Found an issue? Please report it along with any relevant details to reproduce it.
Contributions
Feature requests / pull requests are welcome, though please take a moment to make sure your contributions fits within the scope of the project. Learn how to contribute
Acknowledgments
This library draws inspiration from react-virtualized, and is meant as a bare-minimum replacement for the List component. If you're looking for a tiny, lightweight and dependency-free list virtualization library that supports variable heights, you're in the right place! If you're looking for something that supports more use-cases, I highly encourage you to check out react-virtualized instead, it's a fantastic library ❤️
License
react-tiny-virtual-list is available under the MIT License.