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Infinite Ajax Scroll

Turn your paginated pages into infinite scrolling pages with ease.

Version 1.0.2

Requires jQuery 1.4 or newer.

Licensed under: MIT License - https://raw.github.com/webcreate/infinite-ajax-scroll/master/MIT-LICENSE.txt

Requirements

  • jQuery 1.4+
  • A fully working (server-side) pagination with a 'goto the next page' link

IAS is based on the assumption that you, as a developer, already have taken care for the pagination using a server-side script. What IAS does is loading the next page via AJAX and inserting each individual item into the current page.

Installation

...using Bower

$ bower install jquery-ias

...manually

The pre-build files are in the dist folder.

<script type="text/javascript" src="dist/jquery.ias.min.js"></script>

Optionally add the stylesheet:

<link rel="stylesheet" type="text/css" href="dist/css/jquery.ias.css" />

Basic usage

jQuery.ias({
    container : '.listing',
    item: '.post',
    pagination: '#content .navigation',
    next: '.next-posts a',
    loader: '<img src="dist/images/loader.gif"/>'
});

You can use IAS multiple times within a single webpage. For example, you can have an IAS definition for paginating blogposts and one for comments.

Options

container

Default: "#container"

Enter the selector of the element containing your items that you want to paginate.

item

Default: ".item"

Enter the selector of the element that each item has. Make sure the elements are inside the container element.

pagination

Default: "#pagination"

Enter the selector of the element that contains your regular pagination links, like next, previous and the page numbers. This element will be hidden when IAS loads.

next

Default: ".next"

Enter the selector of the link element that links to the next page. The href attribute of this element will be used to get the items from the next page. Make sure there is only one(1) element that matches the selector.

noneleft

Default: false

Contains the message to be displayed when there are no more pages left to load.

loader

Default: <img src="images/loader.gif"/>

Enter the url to the loader image. This image will be displayed when the next page with items is loaded via AJAX.

loaderDelay

Default: 600

Minimal time (in miliseconds) the loader should be displayed before rendering the items of the next page. Note: This setting will not actually delay the the loading of items itself.

triggerPageThreshold

Default: 3

Page number after which a 'Load more items' link is displayed. Users will manually trigger the loading of the next page by clicking this link.

trigger

Default: "Load more items"

Text of the manual trigger link.

thresholdMargin

Default: 0

On default IAS starts loading new items when you scroll to the latest .item element. The thresholdMargin will be added to the items' offset, giving you the ability to load new items earlier (please note that the margin should be a negative integer for this case).

For example:

Setting a thresholdMargin of -250 means that IAS will start loading 250 pixel before the last item has scrolled into view. A positive margin means that IAS will laod new items N pixels after the last item.

history

Default: true

Set this to false to disable the history module.

The IAS history module uses hashes (in the format "#/page/") to remember the last viewed page, so when a visitor hits the back button after visiting an item from that page, it will load all items up to that last page and scrolls it into view. The use of hashes can be problematic in some cases, in which case you can disable this feature.

scrollContainer

Default: $(window)

By default, scroll events are listened from the $(window) object. You can use this setting to specify a custom container, for example a div with overflow.

beforePageChange

Default: empty function

Event handler. Is called when a user scrolls to another page, but before the new items are loaded. Returning false will cancel the load; any return value other than false will allow the pagination to proceed as normal.

Parameters:

param description
curScrOffset Current scroll offset of the page
nextPageUrl URL of the page that would be loaded if the beforePageChange does not return false

Example:

beforePageChange: function(scrollOffset, nextPageUrl) {
    console.log("The user wants to go to the next page, " +
        "but they can't because we return false!");
    return false;
}

onPageChange

Default: empty function

Event handler. Is called each time the user scrolls to an other page.

Parameters:

param description
pageNum Current page number
pageUrl Url of the current page
scrollOffset scroll offset for this page

Example:

onPageChange: function(pageNum, pageUrl, scrollOffset) {
    console.log('Welcome on page ' + pageNum);
}

onLoadItems

Default: empty function

Event handler. Is called each time new items are loaded.

Parameters:

param description
items array containing the item elements

Return value:

When you return false in the callback, we prevent IAS from automatically insert the loaded items. This can be used to manually insert the items.

Example:

onLoadItems: function(items) {
    console.log('We loaded ' + items.length + ' items');
}

onRenderComplete

Default: empty function

Event handler. Is called each time new items have been inserted in the DOM.

This can be useful when you have a javascript function that normally performs some actions on the items in the document.ready event. When loading items from a new page using IAS, the document ready handler isn't called. Use this event instead.

Parameters:

param description
items array containing the item elements

Example:

onRenderComplete: function(items) {
    console.log('We rendered ' + items.length + ' items');
}

onScroll

Default: empty function

Event handler. Is called during scroll as an extension of the existing scroll event handler.

Allows multiple scroll events to be triggered in addition to IAS. This can be useful when you have another event that needs to be fired during scrolling events, such as the showing/hiding of a "back to top" arrow. This function is called at the end of the regular IAS scroll event handler.

Parameters:

param description
scrollOffset Current scroll offset of the page
currentPage Current page number
scrollThreshold Threshold margin for loading

Example:

onScroll: function(scrollOffset, currentPage, scrollThreshold) { 
    console.log('We are at position ' + scrollOffset + ' and page ' + currentPage);
}

customLoaderProc

Default: false

Custom function callback to handle the rendering of the loader yourself. Per default, the loader will be inserted right after the last item.

Example

customLoaderProc: function(loader) { console.log(loader); }

customTriggerProc

Default: false

Custom function callback to handle the rendering of the trigger yourself. Per default, the trigger will be inserted right after the last item.

Example

customTriggerProc: function(trigger) { console.log(trigger); }

Advanced usage

Integrating Google Analytics

You can integrate Google Analytics by using the onPageChange event. Here is an example:

jQuery.ias({
    container : '.listing',
    item: '.post',
    pagination: '#content .navigation',
    next: '.next-posts a',
    loader: '<img src="images/loader.gif"/>',
    onPageChange: function(pageNum, pageUrl, scrollOffset) {
        // This will track a pageview every time the user
        // scrolls up or down the screen to a different page.
        path = jQuery('<a/>').attr('href',pageUrl)[0].pathname.replace(/^[^\/]/,'/');
        _gaq.push(['_trackPageview', path]);
    }
});

Integrating with jQuery Masonry

Example on how to integrate jQuery Masonry.

jQuery.ias({
    container : '.listing',
    item: '.post',
    pagination: '#content .navigation',
    next: '.next-posts a',
    loader: '<img src="images/loader.gif"/>',
    onLoadItems: function(items) {
        // hide new items while they are loading
        var $newElems = $(items).show().css({ opacity: 0 });
        // ensure that images load before adding to masonry layout
        $newElems.imagesLoaded(function(){
          // show elems now they're ready
          $newElems.animate({ opacity: 1 });
          $('.listing').masonry( 'appended', $newElems, true );
        });
        return true;
    }
});

Customizing

IAS inserts a div element with an image to generate a loader. The div has a class called ias_loader. Using this class you can adjust the styling of the loader.

You can also link to an other loader image. Use the loader option to link to the right image.

Issues

If you have any ideas or bugs, please submit them to the GitHub issue tracker at https://github.com/webcreate/infinite-ajax-scroll. We rely on our users for ideas on improvements and bug reports.

Contributing

Overview

To contribute to IAS please follow the following steps:

  • Install the development tools
  • Write the feature/bugfix
  • Write tests for the feature/bugfix
  • Run tests
  • Build
  • Update README
  • Submit your Pull Request

Installing development tools

  1. Install bower components

    $ bower install

  2. Install npm modules

    $ npm install

Running tests

Testing is done with Busterjs.

Running tests:

$ ./node_modules/.bin/buster server

Launch some browsers and connect to http://localhost:1111 and capture them. Then run:

$ ./node_modules/.bin/buster test -r specification

Build

Building is done using Grunt. To build run:

$ ./node_modules/.bin/grunt

Contributors

These people have contributed to IAS. A dollar sign indicates a paided feature request or donation. Between brackets is the part of IAS they have contributed to.

  • Varun Mishra (IE8 bugfix)
  • Farooq A.Aziz $
  • Sascha Oosterbaan $ (onLoadItems)
  • Loïc Heroguer $ (thresholdMargin)
  • Andy Smith (onRenderComplete, html loader)
  • Gilson D'Elrei $
  • Andy Hausmann $ (CustomLoaderProc, manual trigger, spelling corrections)
  • Romain Hill (scrollContainer)
  • Mark van der Waarde (noneleft)
  • diesachbearbeiter $ (manual trigger)
  • df9web $ (manual trigger)
  • devloper (PR #45)
  • Yuri Vanin (CustomTriggerProc)

And others...