Events

Infinite Ajax Scroll
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Overview
Reference
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Events
Infinite Ajax Scroll provides a wide range of events which we can use to hook into its functionality and customize where needed.
Working with events
You can bind and unbind to events with the on, once and off methods.
let ias = new InfiniteAjaxScroll('.container', options);
​
function handler(event) {
  console.log('New items have been appended', event);
}
​
ias.on('appended', handler);
ias.off('appended', handler);
ias.once('appended', handler);
Reference
ready
This event is triggered when the DOM is ready. Right after this event Infinite Ajax Scroll will bind (unless the bind option is set to false).
binded
This event is triggered when Infinite Ajax Scroll binds to the scroll and resize events of the scroll container. This mostly happens right after the DOM is ready, but this can be configured with the bind option.
unbinded
Triggered when Infinite Ajax Scroll removed its listeners from the scroll and resize events.
Infinite Ajax Scroll will only unbind when we call the unbind method.
scrolled
Triggered when the user scrolls inside the scroll container.
property
type
description
scroll.y
integer
Current vertical scroll position from the top of the page (can be negative)
scroll.x
integer
Current horizontal scroll position from the left of the page (can be negative)
scroll.deltaY
integer
Delta between current vertical scroll position and previous position
scroll.deltaX
integer
Delta between current horizontal scroll position and previous position
The delta values can be used to determine the scroll direction. A positive value means scrolling down (deltaY) or to the right (deltaX). A negative value means the opposite direction.
resized
Triggered when the user resizes the scroll container.
property
type
description
scroll
object
Object with x y coord of the current scroll position
hit
Triggered when the user has hit the scroll threshold for the next page due to scrolling or resizing.
property
type
description
distance
int
The distance to the scroll threshold in pixels
next
Triggered right after the hit event. Indicating that the next page will be loaded.
property
type
description
pageIndex
int
The page index of the next page (the page that is about to be loaded)
pageIndex is zero indexed. This means the index starts at 0 on the first page.
For example to notify the user about loading the next page, you can do:
ias.on('next', function(event) {
  // pageIndex is 0-indexed, so we add 1
  alert(`Page ${event.pageIndex+1} is loading...`);
});
ias.on('nexted', function(event) {
    alert(`Page ${event.pageIndex+1} is loaded and added to the page.`);
});
nexted
Trigger when loading and appending the next page is completed.
property
type
description
pageIndex
int
The page index of the next page (the page that is finished loading)
load
This event is triggered before the next page is requested from the server.
property
type
default
description
url
string
​
The url that is about to be requested
xhr
XMLHttpRequest
​
The configured XMLHttpRequest that is going to be used (see MDN)
method
string
"GET"
The request method to use, e.g. "GET", "POST", etc.
body
mixed
null
Body of the request in case of POST (see MDN)
nocache
boolean
false
Disables cache busting mechanism
responseType
string
"document"
The expected type of response, eg. "document", "json", etc. (also see responseType option)
headers
Object
{'X-Requested-With': 'XMLHttpRequest'}
Key-value object containing request headers
You can use this event to modify any of the above properties.
For example to disable the cache busting you can do:
ias.on('load', function(event) {
  event.nocache = true; // prevent IAS from adding a timestamp query param to the url
});
loaded
This event is triggered when the next page is requested from the server, right before the items will be appended.
property
type
description
items
array
Array of items that have loaded and will be appended. These items match the selector given in the next option
url
string
The url that is about to be requested
xhr
XMLHttpRequest
The configured XMLHttpRequest that is going to be used
error
This event is triggered when an error occurred while loading the next page.
property
type
description
url
string
The url that is about to be requested
method
string
The method used to fetch the url ("GET", "POST", etc)
xhr
XMLHttpRequest
The configured XMLHttpRequest that was used
append
This event is triggered before the items are about to be appended.
property
type
description
items
array
Array of items that will be appended
parent
Element
The element to which the items will be appended
appendFn
function
Function used to append items to the container
See src/append.js for the default append function.
appended
This event is triggered after the items have been appended.
property
type
description
items
array
Array of items that have been appended
parent
Element
The element to which the items have been appended
last
Triggered when the last page is appended.
ias.on('last', () => {
  console.log('Users has reached the last page');
})
​Read more on how we can inform the user about reaching the last page​
page
Triggered when the user scrolls past a page break. The event provides information about the page in view.
property
type
description
pageIndex
int
The page index of the current page
url
string
Url of the page
title
string
Title of the page
sentinel
Element
Sentinel element. Element used to determine on which page the user is
pageIndex is zero-based. This means the index starts at 0 on the first page.
One use case for this event is to update the browser url and title:
ias.on('page', (event) => {
  // update the title
  document.title = event.title;
​
  // update the url
  let state = history.state;
  history.replaceState(state, event.title, event.url);
})
​View this behaviour in a live demo​
prefill
This event is triggered when Infinite Ajax Scroll starts prefill.
ias.on('prefill', () => {
  // do something before prefill starts
})
prefilled
This event is triggered when prefill is finished.
ias.on('prefilled', () => {
  // do something when prefill finished
})