@cantonjs/react-scroll-view
Version:
react scroll component using intersection observer API
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Markdown
> This project is currently in beta and APIs are subject to change before v1.0 release.
# react-scroll-view [WIP]
[](https://circleci.com/gh/cantonjs/react-scroll-view)
[](https://travis-ci.org/cantonjs/react-scroll-view)
React scroll component using [Intersection Observer API](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) in favor of scroll events.
- [Features](#features)
- [Installation](#installation)
- [Getting Started](#getting-started)
- [References](#references)
- [ScrollView Component](#scrollview-component)
- [ScrollObserver Component](#scrollobserver-component)
- [StickySection Component](#stickysection-component)
- [RefreshControl Component](#refreshcontrol-component)
- [License](#license)
## Features
- Support sticky for cross browsers (including Mobile Safari)
- Support refresh control
- Support `onEndReach()`, `onScrollStart()` and `onScrollEnd()` events
- Easy to observe the intersections between ScrollView and children
## Installation
```bash
$ yarn add @cantonjs/react-scroll-view intersection-observer
```
**[Intersection Observer API](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) is required. You should include the [polyfill](https://github.com/w3c/IntersectionObserver/tree/master/polyfill) yourself for cross-browser support**
## Getting Started
```js
import "intersection-observer";
import React, { Component } from "react";
import { ScrollView } from "@cantonjs/react-scroll-view";
export default class App extends Component {
handleEndReached = () => {
console.log("load more");
};
render() {
return (
<ScrollView onEndReached={this.handleEndReached} style={{ height: '100vh' }}>
<h1>React Scroll View</h1>
<p>Awseome!</p>
</ScrollView>
);
}
}
```
## References
### ScrollView Component
```jsx
import { ScrollView } from "@cantonjs/react-scroll-view";
```
Scroll view component
#### Props
| Property | Description | Type |
| ------------------------- | --------------------------------------------------------------------------------------------------------------------------------- | -------- |
| style | These styles will be applied to the ScrollView container | Object |
| className | The className will be applied to the ScrollView container | string |
| contentContainerStyle | These styles will be applied to the ScrollView content container which wraps all of the child views | Object |
| contentContainerClassName | The className will be applied to the ScrollView content container which wraps all of the child views | string |
| onScroll | Fires at most once per frame during scrolling | Function |
| onScrollStart | Called once when the scroll starts | Function |
| onScrollEnd | Called once when the scroll ends | Function |
| onEndReached | Called once when the scroll position gets within `endReachedThreshold` of the rendered content | Function |
| endReachedThreshold | How far from the end (in pixels) the bottom to trigger the `onEndReached` callback | Number |
| isHorizontal | When `true`, the ScrollView's children are arranged horizontally in a row instead of vertically in a column. Defaults to `false` | Boolean |
| disabled | When `true`, the view cannot be scrolled. Defaults to `false` | Boolean |
| refreshControl | A RefreshControl component, used to provide pull-to-refresh functionality for the ScrollView. Only works for vertical ScrollViews | Element |
| innerRef | Use this to access the dom (DIV) ref | Function |
The rest of the props are exactly the same as the original [DOM attributes](https://reactjs.org/docs/dom-elements.html#all-supported-html-attributes).
#### Methods
| Method | Description |
| ------------- | ------------------------------------ |
| scrollTo(val) | Scrolls to a given value immediately |
### ScrollObserver Component
```jsx
import { ScrollObserver } from "@cantonjs/react-scroll-view";
```
Wrap any child component and observe it when in ScrollView.
#### Props
| Property | Description | Type |
| -------- | ----------------------------------------------------------------------------------------- | -------- |
| onEnter | Fires once when the children nodes enter | Function |
| onLeave | Fires once when the children nodes leave | Function |
| innerRef | Use this to access the internal ref | Function |
| children | Children must be a function. Will receive an object with `isIntersecting` and `ref` props | Function |
#### Children function
The `children` prop will receive the following object shape:
| Property | Description | Type |
| -------------- | --------------------------------------------------------------------------------------- | -------- |
| ref | Must be passed down to your component's ref in order to obtain a proper node to observe | Function |
| isIntersecting | Will be `true` if the target element intersects with the ScrollView | Boolean |
#### Example
```js
import "intersection-observer";
import React, { Component } from "react";
import { ScrollView, ScrollObserver } from "@cantonjs/react-scroll-view";
export default class App extends Component {
render() {
return (
<ScrollView style={{ height: '100vh' }}>
<h1>React Scroll View</h1>
<p>Awseome!</p>
<ScrollObserver>
{({ ref, isIntersecting }) =>
<img
ref={ref}
src="/img.jpg"
alt="lazy image"
style={{ display: isIntersecting ? 'inline-block' : 'none' }}
/>
}
</ScrollObserver>
</ScrollView>
);
}
}
```
### StickySection Component
```jsx
import { StickySection } from "@cantonjs/react-scroll-view";
```
Section component with a sticky header.
#### Props
| Property | Description | Type |
| -------- | -------------------------- | ------------- |
| sticky | Sticky header node element | Node/Function |
The rest of the props are exactly the same as the original [DOM attributes](https://reactjs.org/docs/dom-elements.html#all-supported-html-attributes).
#### Example
```js
import "intersection-observer";
import React, { Component } from "react";
import { ScrollView, ScrollSection } from "@cantonjs/react-scroll-view";
export default class App extends Component {
render() {
return (
<ScrollView style={{ height: '100vh' }}>
<StickySection sticky={<h1>A</h1>}>
<ul>
<li>Adelia Pisano</li>
<li>Alayna Loredo</li>
</ul>
</StickySection>
<StickySection sticky={<h1>B</h1>}>
<ul>
<li>Brant Hunsberger</li>
</ul>
</StickySection>
<StickySection sticky={<h1>C</h1>}>
<ul>
<li>Carl Wetzler</li>
<li>Cherry Greeno</li>
<li>Cris Kepley</li>
</ul>
</StickySection>
</ScrollView>
);
}
}
```
### RefreshControl Component
```jsx
import { RefreshControl } from "@cantonjs/react-scroll-view";
```
RefreshControl component
#### Props
| Property | Description | Type |
| ------------ | ------------------------------------------------------- | -------- |
| onRefresh | Called when the view starts refreshing | Function |
| isRefreshing | Whether the view should be indicating an active refresh | Boolean |
| color | The refreshControl icon color | String |
The rest of the props are exactly the same as the original [DOM attributes](https://reactjs.org/docs/dom-elements.html#all-supported-html-attributes).
#### Methods
| Method | Description |
| ---------------- | ----------------------------- |
| requestRefresh() | Request to call `onRefresh()` |
#### Example
```js
import "intersection-observer";
import React, { Component } from "react";
import { ScrollView, RefreshControl } from "@cantonjs/react-scroll-view";
export default class App extends Component {
state = {
isRefreshing: false,
};
handleRefresh = () => {
this.setState({
isRefreshing: true,
});
};
render() {
const { isRefreshing } = this.state;
return (
<ScrollView
style={{ height: '100vh' }}
refreshControl={
<RefreshControl
onRefresh={this.handleRefresh}
isRefreshing={isRefreshing}
/>
}
>
<h1>React Scroll View</h1>
<p>Awseome!</p>
</ScrollView>
);
}
}
```
## License
MIT