React IScroll

Encapsulating iScroll as a react component

iScroll

iScroll is a high performance, small footprint, dependency free, multi-platform javascript scroller.

React

A declarative, efficient, and flexible JavaScript library for building user interfaces.

React IScroll

Since iScroll doesn't provide React version, I found it's very inconvenient to make iScroll work with React. So I decided to write a React component encapsulating iScroll.

How to Use

Install from npm:

npm i iscroll-react

Use React IScroll in your project:

import IScroll from "iscroll-react"
import React, { Component } from 'react'
import iscroll from "iscroll"

class SomeComponent extends Component {
	render() {
		return <IScroll iScroll={iscroll}>
			These contents can be scrolled.
		</IScroll>
	}
}

Props

You can provide props for React-IScroll to use some features.

• iScroll

  Required, iScroll library, see here for different versions of iScroll. Remember that if you use pull-down-to-refresh feature, please provide iscroll-probe.js.

• options

  iScroll options, see here for all options. It's directly provided to iScroll. Note that if you are using pull-down-to-refresh feature, options will be appended an attribute: probeType: 2

  Since you may use React-IScroll many times in your project, setting iScroll options many times would be redundant. To simplify this, I added a setDefaultIScrollOptions function. Initialized once, iScroll will copy the default props on construct.

   import {setDefaultIScrollOptions}  from "iscroll-react"
  
   setDefaultIScrollOptions({
       scrollbars: true,
       mouseWheel: true,
       shrinkScrollbars: "scale",
       fadeScrollbars: true,
       click: true,
   })

• iScroll events

  iScroll itself provide some custom events, here I just wrapped them. All below events will be called with the iScroll instance, e.g. onBeforeScrollStart(iScrollInstance), you can do whatever like reading iScroll properties or calling functions.

  • onBeforeScrollStart <= beforeScrollStart
  • onScrollCancel <= scrollCancel
  • onScrollStart <= scrollStart
  • onScroll <= scroll
  • onScrollEnd <= scrollEnd
  • onFlick <= flick
  • onZoomStart <= zoomStart
  • onZoomEnd <= zoomEnd

• alwaysScroll

  By setting this value to true, the scroller can be scrolled even the scroller's height is smaller than the wrappers. Default is true.

• dynamicTop

  Calculate the wrapper's top dynamically. Default is false.

• dynamicBottomFunc

  Calculate the wrapper's bottom dynamically, since we can't use the wrapper's height for calculation, so I exposed a function.

  Notes: because React-IScroll is mounted before the parent, if you want to use this feature, make sure to call updateIScroll() when the parent is mounted.

• wrapperStyle

  If your wrapper's position is static, using this option the fast set wrapper's CSS attributes: top, bottom, left and right. If not specified, all will be 0.

  Note that top and bottom might be override by dynamicTop and dynamicBottomFunc.

• pullDownToRefresh

  If you want to use pull-down-to-refresh feature, set this value. This option has sub props:

  • labelInactive

    Node showed when scroller is pulled down but not active. You can provide either your React Component or simply a string.

  • labelActive

    Node showed when pulldown is active. Provide either a React Component or string.

  • appearDistance

    If scroller's pull-down distance exceeds this value, labelInactive will be showed. Default is 20.

  • activeDistance

    If scroller's pull-down distance exceeds this value, labelActive will be showed. Default is 55.

    Notes: if you have set the page's viewport, the above two values should be adjusted to get best experience.

  • onRefresh

    Required, When touch is released, this function will be called if the pulldown is active.

Functions

• IScroll.updateIScroll

  Update iScroll by calling iScrollInstance.refresh() and calculate wrapper's positions. Since React-IScroll don't know children updated or not, you might need to call this function manually, e.g. on async data loaded, or on children's state changed.

   import IScroll from "iscroll-react"
   import React, { Component } from 'react'
   import iscroll from "iscroll"
  
   class SomeComponent extends Component {
       componentDidUpdate() {
           if (this.refs.iscroll) {
               this.refs.iscroll.updateIScroll()
           }
       }
  
   	render() {
   		return <IScroll iScroll={iscroll} ref="iscroll">
   			These contents can be scrolled.
   		</IScroll>
   	}
   }

• IScroll.iScrollInstance

  Used to get the iScroll instance, if initialized.

• setDefaultIScrollOptions

  As is explained above, it's used to set iScroll's default options.

Examples

Clone this repo and run npm run examples, then navigate to http://localhost:8080/ to see examples.

• Basic Scroll
• Always Scroll
• Dynamic Top
• Dynamic Bottom
• Scroller's Height Changes
• Async Request & Pull Down to Refresh