---
Title: Content metadata component
Level: Advanced
---
# Content Metadata Component
In this tutorial you will learn how to work with the `ContentMetadataComponent`.
This component is used to render the standard and custom metadata of generic content item (called a _node_) stored in Alfresco Content Services.
With the usual approach "learning by doing", you will see here some practical examples you might find useful in your own application.
As a starting point, we will use and customize the [Alfresco Content App](https://github.com/Alfresco/alfresco-content-app).
## About the ContentMetadataComponent
As described in the `ContentMetadataComponent` documentation, the `adf-content-metadata-card` tag has some useful attributes, included the `preset` attribute, which is used to point to a collection of aspects/properties to render.
Below, you can see the `preset` value requesting to render all the available aspects/properties:
```html
<adf-content-metadata-card
[node]="..."
[preset]="'*'">
</adf-content-metadata-card>
```
As another example, you can see the `preset` value requesting to render all the available aspects/properties related to a specific configuration, named `custom`:
```html
<adf-content-metadata-card
[node]="..."
[preset]="'custom'">
</adf-content-metadata-card>
```
All the `preset` configurations are defined in one single configuration file named `app.config.json`, stored in the `src` folder of the project. The `app.config.json` file contains all the configurations of the ADF application, including a section named `content-metadata`, which is used to store the `presets`. The following JSON excerpt gives an example of configuration for the `preset` named `custom`:
```json
{
"content-metadata": {
"presets": {
"custom": [
{
"title": "APP.CONTENT_METADATA.EXIF_GROUP_TITLE",
"items": [
{
"aspect": "exif:exif",
"properties": [
"exif:pixelXDimension",
"exif:pixelYDimension"
]
}
]
}
]
}
}
}
```
This configuration will show all the listed properties prefixed with `exif:*` in a group titled with the value of the variable `APP.CONTENT_METADATA.EXIF_GROUP_TITLE` for the aspect `exif:exif`.
Since this aspect is not related to the node, the component will simply ignore the rendering and nothing will be displayed for these properties.
In other words: the aspects to be displayed are calculated as an intersection of the preset aspects and the aspects related to the node.
## Adding and using a new `preset` configuration
In this example we will add a new preset configuration and see how it looks in the user interface.
### Adding a new `preset` configuration
To add a new `preset` configuration, edit the `src/app.config.json` file and locate the `content-metadata` section.
Then, append the following JSON to the `presets` content and save the file:
```json
{
"content-metadata": {
"presets": {
"custom": [],
"my-preset": [
{
"title": "This is my preset",
"items": [
{
"aspect": "st:siteContainer",
"properties": [
"*"
]
}
]
}
]
}
}
}
```
**Note:** As an alternative to `"properties": ["*"]` (which matches all the properties of the `st:siteContainer` aspect), you can use `"properties": ["st:componentId"]`, which will render one property only.
### Using the `my-preset` configuration
Now that the `my-preset` configuration is defined, let's use it in a view of the ADF application
```html
<adf-content-metadata-card
[preset]="'my-preset'">
</adf-content-metadata-card>
```
### Properties
| Name | Type | Default value | Description |
|----------|-----------|---------------|------------------------------------------------------------------------------|
| readOnly | `boolean` | false | (optional) This flag sets the metadata in read only mode preventing changes. |
### Viewing the result
After saving the html file, open the ADF app in a browser and dive into the `Personal Files > Sites > swsdp` folder of the Alfresco's repository. Once there, select the `documentLibrary` folder (one click only) and click on the view details icon (the `menu_open icon` on the top right). Scrolling down the metadata tab on the right. You will see different panels: `Properties` (already there by default), `Tags`, `Categories` and `grouped properties`.
In the following screenshot you can see how the result should look:
To check it out, double click on the `documentLibrary` folder and select (with one click) the `Presentations` folder. You should see the `This is my preset` group disappear from the metadata panel, because the node doesn't have the `st:siteContainer` aspect.