alfresco-ng2-components/docs/extensions/components/preview-extension.component.md
Andy Stark 31479cfaa4 [ADF-4152] Restructured remaining doc folders and fixed links (#4441)
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* [ADF-4152] Moved proc services cloud docs to subfolders

* [ADF-4152] Fixed links in PS cloud docs

* [ADF-4152] Added subfolders and checked links for extensions and insights docs

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Markdown

---
Title: Preview Extension Component
Added: v3.1.0
Status: Experimental
Last reviewed: 2018-04-12
---
# [Preview Extension component](../../../lib/extensions/src/lib/components/viewer/preview-extension.component.ts "Defined in preview-extension.component.ts")
Displays dynamically-loaded extension components.
See the [ACA monaco extension](https://github.com/eromano/aca-monaco-extension) for
an example of a real working viewer extension project.
## Class members
### Properties
| Name | Type | Default value | Description |
| ---- | ---- | ------------- | ----------- |
| extension | `string` | | |
| id | `string` | | |
| node | [`Node`](https://github.com/Alfresco/alfresco-js-api/blob/development/src/api/content-rest-api/docs/Node.md) | | of the content to display |
| url | `string` | | URL Of the content in the repository |
## Details
If you want create your custom extension viewer you need to create the following files in a separate project:
The Module needs to know which is the Id of your extension:
```ts
export class YourExtensionViewerModule {
constructor(extensions: ExtensionService) {
extensions.setComponents({
'your-extension.main.component': YourExtensionViewerComponent
});
}
}
```
Your [viewer component](../../core/components/viewer.component.md) extension business logic:
```ts
import { Node } from '@alfresco/js-api';
import { ViewerExtensionInterface } from '@alfresco/adf-extensions';
@Component({
selector: 'your-extension-viewer',
templateUrl: './your-extension-view.component.html',
styleUrls: ['./your-extension-view.component.css'],
encapsulation: ViewEncapsulation.None
})
export class YourExtensionViewerComponent implements ViewerExtensionInterface {
showToolbar = true;
@Input()
url: string;
@Input()
node: Node;
....YOUR CUSTOM LOGIC
}
```
Your [viewer component](../../core/components/viewer.component.md) template:
```HTML
<div> This is your custom extension viewer template</div>
```
Your [viewer component](../../core/components/viewer.component.md) extension.json:
```JSON
{
"$version": "1.0.0",
"$name": "my viewer extension",
"$description": "my viewer plugin",
"features": {
"viewer": {
"content": [
{
"id": "dev.tools.viewer.viewer",
"fileExtension": ["png", "jpg"],
"component": "your-extension.main.component"
}
]
}
}
}
```
## See also
- [Extension service](../services/extension.service.md)