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![PulltoRefresh.js](img/pulltorefresh.gif)
[![Build Status](https://travis-ci.org/BoxFactura/pulltorefresh.js.png)](https://travis-ci.org/BoxFactura/pulltorefresh.js)
[![NPM version](https://badge.fury.io/js/pulltorefreshjs.png)](http://badge.fury.io/js/pulltorefreshjs)
[![CDNJS](https://img.shields.io/cdnjs/v/pulltorefreshjs.svg)](https://cdnjs.com/libraries/pulltorefreshjs)
[**PulltoRefresh.js**](http://www.boxfactura.com/pulltorefresh.js/) • [Demos](http://www.boxfactura.com/pulltorefresh.js/demos/basic.html)
A small, but powerful Javascript library crafted to power your webapp's pull to refresh feature. No markup needed, highly customizable and dependency-free!
---
## Donations
If you found this project helpful, please consider a donation.
[![](https://www.paypalobjects.com/en_US/MX/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=WYS5CSZWWLNN4)
## Installation
Download PulltoRefresh either from the [NPM Registry](https://www.npmjs.com/package/pulltorefreshjs), [CDNJS](https://cdnjs.com/libraries/pulltorefreshjs) or [UNPKG](https://unpkg.com/pulltorefreshjs):
```bash
$ npm install pulltorefreshjs --save-dev
$ wget -O pulltorefresh.js https://unpkg.com/pulltorefreshjs
```
Include the JS file in your webapp and initialize it:
```js
const ptr = PullToRefresh.init({
mainElement: 'body',
onRefresh() {
window.location.reload();
}
});
```
Bundlers can consume `pulltorefreshjs` as CommonJS and ES6-modules syntax:
```js
import PullToRefresh from 'pulltorefreshjs';
// or
const PullToRefresh = require('pulltorefreshjs');
```
API
---
- **`init(options)`**
Will return a unique ptr-instance with a `destroy()` method.
- **`destroyAll()`**
Stop and remove all registered ptr-instances.
- **`setPassiveMode(isPassive)`**
Enable or disable passive mode for event handlers (new instances only).
## Options
- **`distThreshold`** (integer)
Minimum distance required to trigger the refresh.
<br />&mdash; Defaults to `60`
- **`distMax`** (integer)
Maximum distance possible for the element.
<br />&mdash; Defaults to `80`
- **`distReload`** (integer)
After the `distThreshold` is reached and released, the element will have this height.
<br />&mdash; Defaults to `50`
- **`distIgnore`** (integer)
After which distance should we start pulling?
<br />&mdash; Defaults to `0`
- **`mainElement`** (string)
Before which element the pull to refresh elements will be?
<br />&mdash; Defaults to `body`
- **`triggerElement`** (string)
Which element should trigger the pull to refresh?
<br />&mdash; Defaults to `body`
- **`ptrElement`** (string)
Which class will the main element have?
<br />&mdash; Defaults to `.ptr`
- **`classPrefix`** (string)
Which class prefix for the elements?
<br />&mdash; Defaults to `ptr--`
- **`cssProp`** (string)
Which property will be usedto calculate the element's proportions?
<br />&mdash; Defaults to `min-height`
- **`iconArrow`** (string)
The icon for both `instructionsPullToRefresh` and `instructionsReleaseToRefresh`
<br />&mdash; Defaults to `&#8675;`
- **`iconRefreshing`** (string)
The icon when the refresh is in progress.
<br />&mdash; Defaults to `&hellip;`
- **`instructionsPullToRefresh`** (string)
The initial instructions string.
<br />&mdash; Defaults to `Pull down to refresh`
- **`instructionsReleaseToRefresh`** (string)
The instructions string when the `distThreshold` has been reached.
<br />&mdash; Defaults to `Release to refresh`
- **`instructionsRefreshing`** (string)
The refreshing text.
<br />&mdash; Defaults to `Refreshing`
- **`refreshTimeout`** (integer)
The delay, in milliseconds before the `onRefresh` is triggered.
<br />&mdash; Defaults to `500`
- **`getMarkup`** (function)
It returns the default HTML for the widget, `__PREFIX__` is replaced.
<br />&mdash; See [src/lib/markup.js](src/lib/markup.js)
- **`getStyles`** (function)
It returns the default CSS for the widget, `__PREFIX__` is replaced.
<br />&mdash; See [src/lib/styles.js](src/lib/styles.js)
- **`onInit`** (function)
The initialize function.
- **`onRefresh`** (function)
What will the pull to refresh trigger? You can return a promise.
<br />&mdash; Defaults to `window.location.reload()`
- **`resistanceFunction`** (function)
The resistance function, accepts one parameter, must return a number, capping at 1.
<br />&mdash; Defaults to `t => Math.min(1, t / 2.5)`
- **`shouldPullToRefresh`** (function)
Which condition should be met for pullToRefresh to trigger?
<br />&mdash; Defaults to `!window.scrollY` • Please note that this default is useful whenever you're setting mainElement as the body of the document, if you need it in another element with overflow, use `!this.mainElement.scrollTop`. Refer to the [multiple instances demo](https://www.boxfactura.com/pulltorefresh.js/demos/multiple.html) for reference.
## Use with React
With [ReactDOMServer](https://reactjs.org/docs/react-dom-server.html) and `renderToString()` you can use components as
icons instead of just strings.
In this example we also use [Font Awesome](https://fontawesome.com/how-to-use/on-the-web/using-with/react) to get nice icons with animation, but you can
use any React component you like.
[Demo on codesandbox.io](https://codesandbox.io/s/21o9z8rrzy)
```jsx harmony
import React, { Component } from 'react';
import ReactDOMServer from 'react-dom/server';
import PullToRefresh from 'pulltorefreshjs';
import { faSyncAlt} from '@fortawesome/free-solid-svg-icons';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
class App extends Component
{
componentDidMount()
{
PullToRefresh.init({
mainElement: 'body',
onRefresh() {
window.location.reload();
},
iconArrow: ReactDOMServer.renderToString(
<FontAwesomeIcon icon={faSyncAlt} />
),
iconRefreshing: ReactDOMServer.renderToString(
<FontAwesomeIcon icon={faSyncAlt} spin={true} />
),
});
}
componentWillUnmount()
{
// Don't forget to destroy all instances on unmout
// or you will get some glitches.
PullToRefresh.destroyAll();
}
render()
{
return (
<div>
<h1>App</h1>
</div>
);
}
}
export default App;
```
## Contribute
To quickly start the development workflow:
1. Install NodeJS ([NVM](https://github.com/creationix/nvm/blob/master/nvm.sh))
2. Run `nvm use 10 && npm install`
3. Then `npm run dev`
> This will watch and compile the bundle for browser usage.
E2E tests are executed with Testcafé.
- Run `npm test` to use standard Chrome
- Run `npm pretest && npm run test:ci` to run Chrome in headless mode
Advanced debug can be achieved with `testcafe-live`, e.g.
```bash
$ npm test --live chrome tests/e2e/cases --debug-on-fail
```
## Roadmap
- [ ] More events: `onPullStart`, `onPullDown(direction, willRefresh)`, `onRelease(willRefresh)`
- [ ] Fully customizable CSS
- [ ] Gallery of use cases
- [ ] Advanced demos
- [x] Tests
- [x] Minified releases