---
title: "ViewerInitializer | Customer's Canvas On-Premises"
canonical: "https://customerscanvas.com/docs/on-premises/design-atoms-js/reference/design-atoms/ViewerInitializer/"
---

# ViewerInitializer

> [`ViewerInitializer`](#viewerinitializer)

## Classes

### ViewerInitializer

#### Constructors

##### Constructor

```ts
new ViewerInitializer(): ViewerInitializer;
```

###### Returns

#### Methods

##### onInitalization()

```ts
onInitalization(action): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `action` | () => `void` |

###### Returns

`void`

##### onPostInitialization()

```ts
onPostInitialization(action): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `action` | () => `void` |

###### Returns

`void`

##### onSetApiClient()

```ts
onSetApiClient(action): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `action` | () => `void` |

###### Returns

`void`

##### onSetBackendUrl()

```ts
onSetBackendUrl(action): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `action` | () => `void` |

###### Returns

`void`

##### onSetCanvas()

```ts
onSetCanvas(action): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `action` | () => `void` |

###### Returns

`void`

##### setApiClient()

```ts
setApiClient(): void;
```

###### Returns

`void`

##### setBackendUrl()

```ts
setBackendUrl(value): void;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `value` | `string` |

###### Returns

`void`

##### setCanvas()

```ts
setCanvas(): void;
```

###### Returns

`void`