# On List Active Index Change

## Overview

![The On List Active Index Change Node.](https://2628349686-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fwnv17cpjDin2deSlOz0z%2Fuploads%2Fgit-blob-2a40a73007d22f9e486ce3bbedcfce97d78cd095%2Fonlistactiveindexchange.png?alt=media)

The **On List Active Index Change** is an **Event Listener** **Node** used for executing a **Logic Branch** when a **List's** `Active Index` changes.

The `Active Index` of a [**List**](https://docs.incari.com/incari-studio/2023.1/objects-and-types/scene2d-objects/gui/list) is the place of the active item in its order. Indexing starts at 0, so if the very first element of the **List** is the active item, the `Active Index` would be 0.

[**Scope**](https://docs.incari.com/incari-studio/2023.1/overview#scopes): **Scene**, **Prefab**.

## Inputs

| Input             | Type         | Description                                                                        |
| ----------------- | ------------ | ---------------------------------------------------------------------------------- |
| *Pulse Input* (►) | **Pulse**    | A standard **Input Pulse**, to trigger the execution of the **Node**.              |
| `Object ID`       | **ObjectID** | The **Object** in which an `Active Index` change triggers the **Logic Branch**.    |
| `Subscribe` (►)   | **Pulse**    | An **Input Pulse** that needs to be triggered to start listening to the **Event**. |

## Outputs

| Output             | Type         | Description                                                                                                                            |
| ------------------ | ------------ | -------------------------------------------------------------------------------------------------------------------------------------- |
| *Pulse Output* (►) | **Pulse**    | A standard **Output Pulse**, to move onto the next **Node** along the **Logic Branch**, once this **Node** has finished its execution. |
| `Current Index`    | **Int**      | The current `Active Index`.                                                                                                            |
| `Object ID`        | **ObjectID** | The **Object** received as **Input**.                                                                                                  |