alfresco-ng2-components/docs/core/components/viewer.component.md

Title, Added, Status, Last reviewed

Title	Added	Status	Last reviewed
Viewer component	v2.0.0	Active	2023-01-30

Viewer component

Displays content from blob file or url file.

Contents

• Basic usage
  • Transclusions
• Class members
  • Properties
  • Events
• Keyboard shortcuts
• Details
  • Integrating with the Document List component
  • Custom file parameters
  • Supported file formats
  • Configuring PDF.js library
  • Extending the Viewer
  • Custom layout
• See also

Basic usage

Using with blob file:

<adf-viewer 
    [showViewer]="true" 
    [overlayMode]="true" 
    [blobFile]="blobFile"
    [fileName]="'filename.pdf'">
</adf-viewer>

Using with file url:

<adf-viewer 
    [overlayMode]="true" 
    [urlFile]="'https://fileUrl.com/filename.pdf'">
</adf-viewer>

Transclusions

The Viewer component lets you transclude content for the toolbar (and toolbar buttons), the sidebar, thumbnails, and the "Open with" and "More actions" menus. See the Custom layout section for full details of all available tranclusions.

Class members

Properties

Name	Type	Default value	Description
allowDownload	boolean	true	Toggles downloading.
allowFullScreen	boolean	true	Toggles the 'Full Screen' feature.
allowGoBack	boolean	true	Allows back navigation
allowLeftSidebar	boolean	false	Allow the left the sidebar.
allowNavigate	boolean	false	Toggles before/next navigation. You can use the arrow buttons to navigate between documents in the collection.
allowRightSidebar	boolean	false	Allow the right sidebar.
blobFile	Blob		Loads a Blob File
canNavigateBefore	boolean	true	Toggles the "before" ("<") button. Requires allowNavigate to be enabled.
canNavigateNext	boolean	true	Toggles the next (">") button. Requires allowNavigate to be enabled.
fileName	string		Content filename.
mimeType	string		MIME type of the file content (when not determined by the filename extension).
overlayMode	boolean	false	If true then show the Viewer as a full page over the current content. Otherwise fit inside the parent div.
showLeftSidebar	boolean	false	Toggles left sidebar visibility. Requires allowLeftSidebar to be set to true.
showRightSidebar	boolean	false	Toggles right sidebar visibility. Requires allowRightSidebar to be set to true.
showToolbar	boolean	true	Hide or show the toolbar
showViewer	boolean	true	Hide or show the viewer
sidebarLeftTemplate	TemplateRef<any>	null	The template for the left sidebar. The template context contains the loaded data.
sidebarRightTemplate	TemplateRef<any>	null	The template for the right sidebar. The template context contains the loaded data.
tracks	Track[]	[]	media subtitles for the media player
urlFile	string	""	If you want to load an external file that does not come from ACS you can use this URL to specify where to load the file from.

Events

Name	Type	Description
navigateBefore	EventEmitter<KeyboardEvent | MouseEvent>	Emitted when user clicks 'Navigate Before' ("<") button.
navigateNext	EventEmitter<KeyboardEvent | MouseEvent>	Emitted when user clicks 'Navigate Next' (">") button.
showViewerChange	EventEmitter<boolean>	Emitted when the viewer is shown or hidden.
submitFile	EventEmitter<Blob>	Emitted when the img is submitted in the img viewer.

Keyboard shortcuts

Name	Description
Esc	Close the viewer (overlay mode only).
Left	Invoke 'Navigate before' action.
Right	Invoke 'Navigate next' action.
Ctrl+F	Activate full-screen mode.

Details

Custom file parameters

You can provide custom file parameters, for example a value for the mimeType or fileName when using URL values that have no file names or extensions:

<adf-viewer
    [fileName]="fileName"
    [allowGoBack]="false"
    [mimeType]="mimeType"
    [urlFile]="fileUrl">
</adf-viewer>

Supported file formats

The Viewer component consists of separate Views that handle particular file types or type families based on either a file extension or a mime type:

• PDF View
  • application/pdf
  • *.pdf
• Image View
  • image/png
  • image/jpeg
  • image/gif
  • image/bmp
  • image/svg+xml
  • *.png
  • *.jpg
  • *.jpeg
  • *.gif
  • *.bpm
  • *.svg
• Text View
  • text/plain
  • text/csv
  • text/xml
  • text/html
  • application/x-javascript
  • *.txt
  • *.xml
  • *.js
  • *.html
  • *.json
  • *.ts
• Media View
  • video/mp4
  • video/webm
  • video/ogg
  • audio/mpeg
  • audio/ogg
  • audio/wav
  • *.wav
  • *.mp4
  • *.mp3
  • *.webm
  • *.ogg

Configuring PDF.js library

Configure your webpack-enabled application with the PDF.js library as follows.

1. Install pdfjs-dist

npm install pdfjs-dist

2. Update vendors.ts by appending the following code. This will enable the viewer component and compatibility mode for all browsers. It will also configure the web worker for the PDF.js library to render PDF files in the background:

// PDF.js
require('pdfjs-dist/web/compatibility.js');
const pdfjsLib = require('pdfjs-dist');
pdfjsLib.PDFJS.workerSrc = './pdf.worker.js';
require('pdfjs-dist/web/pdf_viewer.js');

3. Update the plugins section of the webpack.common.js file with the following lines:

new CopyWebpackPlugin([
    ...
    {
        from: 'node_modules/pdfjs-dist/build/pdf.worker.js',
        to: 'pdf.worker.js'
    }
])

The Viewer component should now be able to display PDF files.

Extending the Viewer

Internal extension mechanism

The Viewer supports dynamically-loaded viewer preview extensions, to know more about it Preview Extension component. This

Code extension mechanism]

You can define your own custom handler to handle other file formats that are not yet supported by the Viewer component. Below is an example that shows how to use the adf-viewer-extension to handle 3D data files:

<adf-viewer [urlFile]="urlFile">
    
    <adf-viewer-extension [supportedExtensions]="['obj','3ds']" #extension>
        <ng-template let-urlFileContent="urlFileContent" let-extension="extension">
            <threed-viewer 
                [urlFile]="urlFileContent" 
                [extension]="extension">
            </threed-viewer>
        </ng-template>
    </adf-viewer-extension>

</adf-viewer> 

Note: you need to add the ng2-3d-editor dependency to your package.json file to make the example above work.

You can define multiple adf-viewer-extension templates if required:

<adf-viewer [urlFile]="urlFile">

    <adf-viewer-extension [supportedExtensions]="['xls','xlsx']" #extension>
        <ng-template let-urlFileContent="urlFileContent">
            <my-custom-xls-component 
                urlFileContent="urlFileContent">
            </my-custom-xls-component>
        </ng-template>
    </adf-viewer-extension>

    <adf-viewer-extension [supportedExtensions]="['txt']" #extension>
        <ng-template let-urlFileContent="urlFileContent" >               
            <my-custom-txt-component 
                urlFileContent="urlFileContent">
            </my-custom-txt-component>
        </ng-template>
    </adf-viewer-extension>
</adf-viewer> 

Custom layout

The Viewer component lets you transclude custom content in several different places as explained in the sections below.

Custom toolbar

You can replace the standard viewer toolbar with your own custom implementation:

<adf-viewer>
    <adf-viewer-toolbar>
        <h1>toolbar</h1>
    </adf-viewer-toolbar>
</adf-viewer>

Everything you put inside the "adf-viewer-toolbar" tags will be rendered instead of the standard toolbar.

Custom toolbar buttons

If you are happy with the custom toolbar's behaviour but want to add some extra buttons then you can do so as shown in the following example:

<adf-viewer>
    <adf-viewer-toolbar-actions>
        <button mat-icon-button>
            <mat-icon>alarm</mat-icon>
        </button>
        <button mat-icon-button>
            <mat-icon>backup</mat-icon>
        </button>
        <button mat-icon-button>
            <mat-icon>bug_report</mat-icon>
        </button>
    </adf-viewer-toolbar-actions>
</adf-viewer>

The result should look like this:

Custom sidebar

The Viewer component also supports custom sidebar components and layouts. Set the allowRightSidebar property to true to enable this feature.

The custom sidebar can be injected in two different ways. The first way is to use transclusion, which will display all content placed inside the <adf-viewer-sidebar> element:

<adf-viewer [allowRightSidebar]="true">
    <adf-viewer-sidebar>
        <h1>My info</h1>
    </adf-viewer-sidebar>
</adf-viewer>

Custom "Open With" menu

You can enable a custom "Open With" menu by providing at least one action inside the adf-viewer-open-with tag:

<adf-viewer [urlFile]="urlFile">

    <adf-viewer-open-with>
        <button mat-menu-item>
            <mat-icon>dialpad</mat-icon>
            <span>Option 1</span>
        </button>
        <button mat-menu-item disabled>
            <mat-icon>voicemail</mat-icon>
            <span>Option 2</span>
        </button>
        <button mat-menu-item>
            <mat-icon>notifications_off</mat-icon>
            <span>Option 3</span>
        </button>
    </adf-viewer-open-with>

</adf-viewer>

Custom "More actions" menu

You can enable a custom "More actions" menu by providing at least one action inside the adf-viewer-more-actions tag:

<adf-viewer [urlFile]="urlFile">

    <adf-viewer-more-actions>
        <button mat-menu-item>
            <mat-icon>dialpad</mat-icon>
            <span>Action One</span>
        </button>
        <button mat-menu-item disabled>
            <mat-icon>voicemail</mat-icon>
            <span>Action Two</span>
        </button>
        <button mat-menu-item>
            <mat-icon>notifications_off</mat-icon>
            <span>Action Three</span>
        </button>
    </adf-viewer-more-actions>

</adv-viewer>

Custom zoom scaling

You can set a default zoom scaling value for pdf viewer by adding the following code in app.config.json. Note: For the pdf viewer the value has to be within the range of 25 - 1000.

"adf-viewer": { "pdf-viewer-scaling": 150 }

In the same way you can set a default zoom scaling value for the image viewer by adding the following code in app.config.json.

"adf-viewer": { "image-viewer-scaling": 150 }

By default the viewer's zoom scaling is set to 100%.

See also

• Document List component
• Preview Extension component