---
title: "ImageViewerFitImageToBoundsControl | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Class ImageViewerFitImageToBoundsControl`Maptiler`

Interface for interactive controls added to the map. This is a specification for implementers to model: it is not an exported method or class.

Controls must implement `onAdd` and `onRemove`, and must own an element, which is often a `div` element. To use MapLibre GL JS's default control styling, add the `maplibregl-ctrl` class to your control's node.

#### Example[](#example)

```typescript
class HelloWorldControl: IControl {
    onAdd(map) {
        this._map = map;
        this._container = document.createElement('div');
        this._container.className = 'maplibregl-ctrl';
        this._container.textContent = 'Hello, world';
        return this._container;
    }

    onRemove() {
        this._container.remove();
        this._map = undefined;
    }
}
```

#### Implements

-   [IControl](https://docs.maptiler.com/sdk-js/api-reference/interfaces/IControl/)

##### Index

### Constructors[](#constructors)

[constructor](#constructor)

### Methods[](#methods)

[handleClick](#handleclick) [onAdd](#onadd) [onRemove](#onremove)

## Constructors[](#constructors-1)

### `Maptiler`constructor[](#constructor)

-   new ImageViewerFitImageToBoundsControl(  
        \_\_namedParameters: { imageViewer: [ImageViewer](https://docs.maptiler.com/sdk-js/api-reference/classes/ImageViewer/) },  
    ): ImageViewerFitImageToBoundsControl[](#constructorimageviewerfitimagetoboundscontrol)
    
    #### Parameters
    
    -   \_\_namedParameters: { imageViewer: [ImageViewer](https://docs.maptiler.com/sdk-js/api-reference/classes/ImageViewer/) }
    
    #### Returns ImageViewerFitImageToBoundsControl
    

## Methods[](#methods-1)

### `Maptiler`handleClick[](#handleclick)

-   handleClick(): void[](#handleclick-1)
    
    #### Returns void
    

### `Maptiler`onAdd[](#onadd)

-   onAdd(\_map: [Map](https://docs.maptiler.com/sdk-js/api-reference/classes/Map/)): [HTMLElement](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.HTMLElement/)[](#onadd-1)
    
    Register a control on the map and give it a chance to register event listeners and resources. This method is called by [Map.addControl](https://docs.maptiler.com/sdk-js/api-reference/classes/Map/#addcontrol) internally.
    
    #### Parameters
    
    -   \_map: [Map](https://docs.maptiler.com/sdk-js/api-reference/classes/Map/)
    
    #### Returns [HTMLElement](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.HTMLElement/)
    
    The control's container element. This should be created by the control and returned by onAdd without being attached to the DOM: the map will insert the control's element into the DOM as necessary.
    
    Implementation of [IControl](https://docs.maptiler.com/sdk-js/api-reference/interfaces/IControl/).[onAdd](https://docs.maptiler.com/sdk-js/api-reference/interfaces/IControl/#onadd)
    

### `Maptiler`onRemove[](#onremove)

-   onRemove(): void[](#onremove-1)
    
    Unregister a control on the map and give it a chance to detach event listeners and resources. This method is called by [Map.removeControl](https://docs.maptiler.com/sdk-js/api-reference/classes/Map/#removecontrol) internally.
    
    #### Returns void
    
    Implementation of [IControl](https://docs.maptiler.com/sdk-js/api-reference/interfaces/IControl/).[onRemove](https://docs.maptiler.com/sdk-js/api-reference/interfaces/IControl/#onremove)