🙈 react-collapsed (useCollapse)
A React hook for creating accessible expand/collapse components. Animates the height using CSS transitions from 0 to auto.
Features
- Handles the height of animations of your elements,
auto included!
- You control the UI -
useCollapse provides the necessary props, you control the styles and the elements.
- Accessible out of the box - no need to worry if your collapse/expand component is accessible, since this takes care of it for you!
- No animation framework required! Simply powered by CSS animations
- Written in TypeScript
Demo
See the demo site!
CodeSandbox demo
Installation
$ npm i react-collapsed
Usage
Simple Usage
import React from "react";
import { useCollapse } from "react-collapsed";
function Demo() {
const { getCollapseProps, getToggleProps, isExpanded } = useCollapse();
return (
<div>
<button {...getToggleProps()}>
{isExpanded ? "Collapse" : "Expand"}
</button>
<section {...getCollapseProps()}>Collapsed content 🙈</section>
</div>
);
}
Control it yourself
import React, { useState } from "react";
import { useCollapse } from "react-collapsed";
function Demo() {
const [isExpanded, setExpanded] = useState(false);
const { getCollapseProps, getToggleProps } = useCollapse({ isExpanded });
return (
<div>
<button
{...getToggleProps({
onClick: () => setExpanded((prevExpanded) => !prevExpanded),
})}
>
{isExpanded ? "Collapse" : "Expand"}
</button>
<section {...getCollapseProps()}>Collapsed content 🙈</section>
</div>
);
}
API
const { getCollapseProps, getToggleProps, isExpanded, setExpanded } =
useCollapse({
isExpanded: boolean,
defaultExpanded: boolean,
collapsedHeight: 0,
easing: string,
duration: number,
onTransitionStateChange: func,
});
useCollapse Config
The following are optional properties passed into useCollapse({ }):
| Prop | Type | Default | Description |
|---|
| isExpanded | boolean | undefined | If true, the Collapse is expanded |
| defaultExpanded | boolean | false | If true, the Collapse will be expanded when mounted |
| collapsedHeight | number | 0 | The height of the content when collapsed |
| easing | string | cubic-bezier(0.4, 0, 0.2, 1) | The transition timing function for the animation |
| duration | number | undefined | The duration of the animation in milliseconds. By default, the duration is programmatically calculated based on the height of the collapsed element |
| onTransitionStateChange | function | no-op | Handler called with at each stage of the transition animation |
| hasDisabledAnimation | boolean | false | If true, will disable the animation |
| id | string | number | undefined | Unique identifier used to for associating elements appropriately for accessibility. |
What you get
| Name | Description |
|---|
| getCollapseProps | Function that returns a prop object, which should be spread onto the collapse element |
| getToggleProps | Function that returns a prop object, which should be spread onto an element that toggles the collapse panel |
| isExpanded | Whether or not the collapse is expanded (if not controlled) |
| setExpanded | Sets the hook's internal isExpanded state |
Alternative Solutions
- react-spring - JavaScript animation based library that can potentially have smoother animations. Requires a bit more work to create an accessible collapse component.
- react-animate-height - Another library that uses CSS transitions to animate to any height. It provides components, not a hook.
FAQ
When I apply vertical padding to the component that gets getCollapseProps, the animation is janky and it doesn't collapse all the way. What gives?
The collapse works by manipulating the height property. If an element has vertical padding, that padding expandes the size of the element, even if it has height: 0; overflow: hidden.
To avoid this, simply move that padding from the element to an element directly nested within in.
// from
<div {...getCollapseProps({style: {padding: 20}})}
This will do weird things
</div>
// to
<div {...getCollapseProps()}
<div style={{padding: 20}}>
Much better!
</div>
</div>
