Infinite Ajax Scroll Plugin In jQuery & Vanilla JS - ias.js

Infinite Ajax Scroll Plugin In jQuery & Vanilla JS - ias.js
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License: MIT

ias.js (Infinite Ajax Scroll) is a jQuery and pure (vanilla) JavaScript plugin that helps you create SEO-friendly, progressively enhanced infinite scrolling effect with ajax technique for loading more items of your page when scroll down. 

Note that the latest Infinite Ajax Scroll (v3.0+) has dropped the jQuery support. You can use it as a vanilla JavaScript library. Download Here.

What is Infinite Scroll?

Infinite Scroll is an awesome and powerful effect that applied to many modern websites like pinterest, facebook, twitter and etc. It provides a basic mechanism for triggering more contents to be loaded when the bottom of the page is reached.

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Table Of Contents:

How to use it (v3.x, Vanilla JS version):

1. Install and import the Infinite Ajax Scroll.

$ npm install @webcreate/infinite-ajax-scroll --save
import InfiniteAjaxScroll from '@webcreate/infinite-ajax-scroll';

2. Or load the UMD version of the Infinite Ajax Scroll library from a CDN.

<script src="[email protected]/dist/infinite-ajax-scroll.min.js"></script>
<!-- OR -->
<script src="[email protected]/dist/infinite-ajax-scroll.min.js"></script>

3. The HTML for the infinite scroll view.

<div class="container">
  <div class="item">...</div>
  <div class="item">...</div>
  <div class="item">...</div>

<div class="pagination">
  <a href="page2.html" class="next">Next</a>

4. Initialize the Infinite Ajax Scroll and done.

let ias = new InfiniteAjaxScroll('.container', {
    item: '.item',
    next: '.next',
    pagination: '.pagination'

How to use it (v2.x, jQuery version):

1. Add the latest jQuery library and ias.js script to your head section of the page.

<script src="/path/to/jquery.min.js"></script>
<script src="/path/to/jquery-ias.min.js"></script>

2. Create list items and a navigation link with the CSS class of 'next' as follows:

<div id="content">
  <div class="listing">
    <div class="post"> <strong>Item 1</strong>
    <div class="post"> <strong>Item 2</strong>
  <div class="navigation">
      <li class="next-posts">
        <a href="page2.html" class="next">2</a>

3. Initialize the plugin on document ready and done.

$(document).ready(function() {
    item: '.post',
    container: '.listing',
    next: '.next',
    pagination: '.navigation'

4. Available extensions:

  • History: Allows to back to the previous page.
  • None Left: Custom content when there's no result.
  • Paging: Triggers an event on page change.
  • Spinner: Custom loading spinner.
  • Trigger: Custom trigger element to load more content.
var ias = jQuery.ias();

// trigger extension
ias.extension(new IASTriggerExtension({
  text: 'Load more items'

// paging extension
jQuery.ias().extension(new IASPagingExtension());
jQuery.ias().on('pageChange', function(pageNum, scrollOffset, url) {
    "Welcome at page " + pageNum + ", " +
    "the original url of this page would be: " + url

// None Left extension
ias.extension(new IASNoneLeftExtension({
  text: 'You reached the end.', // optionally

// history extension
ias.extension(new IASTriggerExtension({
  prev: '.previous'
jQuery.ias().prev(); // loads the previous page

// spinner extension
ias.extension(new IASSpinnerExtension({
  src: 'spinner.gif' // optionally

5. All plugin options to customize the infinite scroll effect.


  // item selector
  item: '.item',

  // container selector
  container: '.listing',

  // navigation selector
  next: '.next',

  // specifies the pagination control
  pagination: false,

  // delay in ms
  delay: 600,

  // the offset to trigger the infinite scroll
  negativeMargin: 10,

  // initializes the plugin on document ready
  initialize: true

6. API methods.

jQuery.ias().on('eventName', function(){});
jQuery.ias().off('eventName', function(){});
jQuery.ias().one('eventName', function(){});

7. Event handlers.

var ias = jQuery.ias();

ias.on('scroll', function(scrollOffset, scrollThreshold) {
  // on scroll

ias.on('load', function(event) {
  // do something

ias.on('loaded', function(data, items) {
  // do something

ias.on('render', function(items) {
  // before rendering

ias.on('rendered', function(items) {
  // after rendered

ias.on('noneLeft', function() {
  // when reaching the bottom

ias.on('next', function(url) {
  // when the next page should be loaded


v3.0.0beta 4 (2019-07-14)

v2.3.2 (2018-06-05)

  • Update

v2.2.3 (2018-03-15)

  • Improved documentation
  • Fix: Cannot read property 'Deferred' of undefined (in jQuery noConflict mode) 
  • Small tweaks

v2.2.2 (2017-06-23)

  • Fix: render callback is not executed when using a custom render function 
  • Fix: unpredictable behaviour when multiple instances used the same selectors for sub-elements
  • Stop ajax responder if instance was destroyed or reinitialized
  • Code tweaks

v2.2.1 (2016-06-16)

  • Fix: prevent multiple initialisations causing duplicate items
  • Fix scoping bug in container getter
  • Stop ajax responder if instance was destroyed or reinitialized

v2.2.0 (2015-01-16)

  • Improved documentation on delay and negativeMargin options
  • Added FAQ to support documentation
  • Added Wordpress cookbook
  • Fix: Maintain history state object when changing pages (longzheng)
  • Fix: no longer caching $itemsContainer (fixes #153)
  • Fix: really destroy instance on destroy method (fixes #160)
  • Fix: Replaced deprecated size() with .length (fixes #162)
  • Fix: Reworked binding and unbinding (fixes various issues with unbinding)
  • Fix: Bail out when device doesn't support onScroll event (like Opera Mini) (fixes #146 by fflewddur)
  • Added reinitialize method

v2.1.3 (2014-10-03)

  • Improve compatibility support when Prototype is used along with jQuery

v2.1.1 (2014-05-14)

  • Changed argument of load event from url to event object
  • Fixed prev() return value

v2.1.0 (2014-02-23)

  • Added History extension
  • Added ready event
  • Added loaded event (load is now triggered before loading starts)
  • Added rendered event (render is now triggered before rendering starts)
  • Added priority to callbacks
  • Added initialize call for extensions
  • Added one method

v2.0.0 (2014-02-01)

  • Completely rewritten
  • Extensible through extensions
  • Extensible through events
  • Added an extensive test suite

v1.1.0 (2014-01-29)

  • Typo and spelling fixes (threshold)
  • Added customTriggerProc
  • Fixed triggerPageThreshold when zero
  • Added onScroll event
  • Improved compatibility with jQuery 1.4
  • Fixed noneLeft

This awesome jQuery plugin is developed by webcreate. For more Advanced Usages, please check the demo page or visit the official website.