# Javascript Callbacks (deprecated)

{% hint style="danger" %} <mark style="color:orange;">Javascript Callbacks are deprecated and have been replaced by events in our</mark> [<mark style="color:orange;">Web SDK</mark>](https://docs.iadvize.dev/technologies/web-and-mobile-sdk/javascript-web-sdk)
{% endhint %}

## Introduction <a href="#introduction" id="introduction"></a>

iAdvize provides Javascript callbacks functions that can be used to perform actions on specific events.

Some callbacks have a parameter that contains data specific to the triggered event.

## How to use callbacks <a href="#how-to-use-callbacks" id="how-to-use-callbacks"></a>

To execute custom code during an iAdvize callback function you have to define the callbacks you want to use in a `window.iAdvizeCallbacks` object.

{% hint style="warning" %}
Please note that the `window.iAdvizeCallbacks` must be defined before the main iAdvize tag.
{% endhint %}

## &#x20;<a href="#guides-callbacks" id="guides-callbacks"></a>