alfresco-ng2-components/docs/extensions/components/preview-extension.component.md

129 lines
3.3 KiB
Markdown

---
Title: Preview Extension Component
Added: v3.1.0
Status: Experimental
Last reviewed: 2019-03-15
---
# [Preview Extension component](../../../lib/extensions/src/lib/components/viewer/preview-extension.component.ts "Defined in preview-extension.component.ts")
Supports dynamically-loaded viewer preview extensions.
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` | | File extension (.jpg, .png, etc) for the viewer. |
| id | `string` | | ID string of the component to preview. |
| nodeId | `string` | null | Identifier of a node opened by a viewer. |
| url | `string` | | URL of the content in the repository. |
## Details
To create your custom extension viewer you need to create the following files in a separate project:
The Module needs to declare 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 contains
the 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
}
```
The [viewer component](../../core/components/viewer.component.md)
also needs an HTML template (which is referenced by the `templateUrl` property
in the `@Component` decorator of the component class above):
```HTML
<div> This is your custom extension viewer template</div>
```
You also need to provide a [viewer component](../../core/components/viewer.component.md)`extension.json` file containing its details:
```JSON
{
"$version": "1.0.0",
"$name": "my viewer extension",
"$description": "my viewer plugin",
"features": {
"viewer": {
"content": [
{
"id": "dev.tools.viewer.viewer",
"fileExtension": ["png", "jpg"],
"component": "your-extension.main.component"
}
]
}
}
}
```
You can also use `*` wildcard to register a single component that opens all files:
```json
{
"$version": "1.0.0",
"$name": "my viewer extension",
"$description": "my viewer plugin",
"features": {
"viewer": {
"content": [
{
"id": "dev.tools.viewer.viewer",
"fileExtension": "*",
"component": "your-extension.main.component"
}
]
}
}
}
```
> It is recommended to use wildcard replacement only when introducing your own Viewer implementation.
See the [App extensions](../../user-guide/app-extensions.md) page for
further details of how to develop extensions.
## See also
- [Extension service](../services/extension.service.md)
- [App extensions](../../user-guide/app-extensions.md)