# On JavaScript Callback

## Overview

![The On JavaScript Callback Node.](/files/5xDVn60PSQh1DaE1IG2N)

**On JavaScript Callback** is an **Event Listener** **Node** used for executing a **Logic Branch** when a JavaScript function is called. This function needs to be defined in the **Web Sprite** that is given as **Object** **Attribute**.

[**Scope**](/incari-studio/2023.1/toolbox/overview.md#scopes): **Scene**, **Prefab**.

## Attributes

![The On JavaScript Callback Node.](/files/ctzNghJBdKhUdnE8Pa04)

### Object

| Attribute | Type         | Description                                                                                                          |
| --------- | ------------ | -------------------------------------------------------------------------------------------------------------------- |
| `Object`  | **ObjectID** | **Web Sprite** **Object** that contains the callback function, if none is given in the `Object ID` **Input Socket**. |

### Function

| Attribute          | Type       | Description                                                                                                         |
| ------------------ | ---------- | ------------------------------------------------------------------------------------------------------------------- |
| `JS Function Name` | **String** | The name of the function that will trigger the **Logic**, if none is given in the `Function name` **Input Socket**. |

### Outputs

#### Data Types

| Attribute        | Type          | Description                                                         |
| ---------------- | ------------- | ------------------------------------------------------------------- |
| `Data Types [n]` | **Drop-down** | Label and **Data Type** of the corresponding **Output** **Socket**. |

## Inputs

| Input           | Type         | Description                                                                        |
| --------------- | ------------ | ---------------------------------------------------------------------------------- |
| `Object ID`     | **ObjectID** | **Web Sprite** **Object** that contains the callback function.                     |
| `Function name` | **String**   | The name of the function that will trigger the **Logic**.                          |
| `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. |
| `Parameter`        | *Defined in the `Data Type`* ***Attribute*** | Parameter received by the callback function.                                                                                           |
| `Object ID`        | **ObjectID**                                 | **Web Sprite** **Object** received as **Input**.                                                                                       |

## See Also

* [**Call JavaScript Function**](/incari-studio/2023.1/toolbox/web/call-javascript-function.md)


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