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title: Dynamsoft Document Viewer API Reference - Interface CustomViewerConstructorOptions
keywords: Documentation, Dynamsoft Document Viewer, API Reference, Interface CustomViewerConstructorOptions
breadcrumbText: Interface CustomViewerConstructorOptions
description: Dynamsoft Document Viewer Documentation API Reference Interface CustomViewerConstructorOptions Page
permalink: /api/interface/customviewerconstructoroptions.html
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# CustomViewerConstructorOptions

## Syntax

```typescript
interface CustomViewerConstructorOptions {
    container?: string | HTMLElement;
    uiConfig?: UiConfig;
}
```

## Attributes

### container

The container which is used to show the viewer. Its `id` or `HTMLElement` is acceppted.

### uiConfig

The UI layout configurations of viewer, please refer to [`UiConfig`](https://www.dynamsoft.com/document-viewer/docs/api/interface/uiconfig.md).

## Related

- [`CustomViewer()`](https://www.dynamsoft.com/document-viewer/docs/api/class/customviewer.md#customviewer)