How do I make iScroll work on mobile devices?

Initialize iScroll with options like disableMouse and disablePointer for touch-only devices, ensure the wrapper has position:relative, and load it on window onload for correct dimensions. Use the tap event for click handling instead of native clicks.

iScroll vs native scrolling: which is better for performance?

iScroll can offer smoother, customizable scrolling on older browsers and devices where native scrolling is janky, but it adds JavaScript overhead. On modern browsers with good native support, iScroll might be unnecessary unless you need advanced features like snap or parallax.

Why is my iScroll stuttering or laggy?

Common causes include using CSS properties like box-shadow or opacity that hinder hardware acceleration, having too many elements in the scroller, or not enabling HWCompositing. The README advises experimenting with CSS and adjusting options like useTransition.

How to implement parallax scrolling with iScroll?

Use the indicators option to create multiple layers that follow the main scroller at different speed ratios. Set ignoreBoundaries and adjust speedRatioX/Y for each indicator to achieve the parallax effect, as shown in the demos.

Can I use iScroll with React or Vue.js?

Yes, but it requires manual integration since iScroll is a vanilla JS library. You'll need to initialize and manage the iScroll instance in lifecycle methods, handle DOM updates with refresh(), and bind events carefully to avoid conflicts with the framework's virtual DOM.

How to refresh iScroll after loading content dynamically?

Call the refresh() method after DOM updates, typically inside a setTimeout with 0ms delay to ensure the browser has repainted. For complex changes, increase the timeout to 100-200ms for better reliability.

What's the difference between iscroll.js and iscroll-lite.js?

iscroll.js includes all standard features like snap, scrollbars, and mouse wheel, while iscroll-lite.js strips these down to basic scrolling for minimal footprint and maximum performance on mobile, but lacks advanced functionality.

Open-Awesome

iscroll

MITJavaScript

A high-performance, dependency-free JavaScript scroller for smooth scrolling, zooming, panning, and carousels across all devices.

Visit Website GitHub

12.8k stars3.7k forks0 contributors

What is iscroll?

iScroll is a lightweight, dependency-free JavaScript library that provides smooth, customizable scrolling for web applications. It solves the problem of inconsistent native scrolling across devices by offering a unified solution with features like momentum scrolling, zooming, snapping, and parallax effects. The library is optimized for performance and works seamlessly on desktops, mobiles, and smart TVs.

Target Audience

Web developers building interactive applications that require enhanced scrolling experiences, such as mobile web apps, carousels, image galleries, or long lists with smooth navigation.

Value Proposition

Developers choose iScroll for its tiny footprint (4kb), cross-platform reliability, and extensive customization options. Unlike native scrolling, it offers granular control over scroll behavior, supports advanced features like infinite scrolling and zoom, and ensures consistent performance on both modern and legacy devices.

Overview

Smooth scrolling for the web

Use Cases

Best For

Adding smooth, momentum-based scrolling to mobile web applications
Building interactive carousels or image galleries with snapping
Implementing parallax scrolling effects with layered indicators
Creating long, scrollable lists with infinite scrolling capabilities
Developing zoomable interfaces for maps or image viewers
Enhancing scrolling on older browsers where native scrolling is limited

Not Ideal For

Projects that prioritize server-side rendering or aim for zero JavaScript execution
Teams using modern component frameworks like React or Vue who prefer integrated scrolling solutions
Applications where native browser scrolling is fully adequate and no custom scrolling features are needed
Developers seeking drop-in, pre-styled scrollbars without the need for custom CSS and event handling

Pros & Cons

Pros

Cross-Platform Reliability

Delivers consistent smooth scrolling on diverse platforms from older Android devices to iPhones and Internet Explorer, addressing native scrolling inconsistencies.

Lightweight and Optimized

With a 4kb footprint and hardware acceleration, it's engineered for high performance without bloating the bundle size.

Highly Customizable Scrolling

Offers granular control with user-defined easing functions, snap points, zoom, and a rich event system for tailored interactions.

Versatile Build Variants

Provides specialized versions like iscroll-lite for minimal scrolling, iscroll-zoom for pinch-to-zoom, and iscroll-infinite for cached lists, allowing precise feature selection.

Cons

Fussy DOM and Initialization

Requires a specific wrapper-child structure and careful timing (e.g., onload delays) to calculate dimensions correctly, adding setup complexity.

CSS Performance Pitfalls

Using CSS properties like box-shadow or opacity with hardware acceleration can cause lag and jerkiness, necessitating experimentation and workarounds.

Incomplete or Experimental Features

Key features like infinite scrolling are marked as 'in an early stage of development' and not stable for production use.

Manual Refresh Management

Developers must manually call the refresh() method after DOM changes, often with timeouts, to avoid incorrect scroller sizing, which can be error-prone.

Frequently Asked Questions

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