# App Shell Component

A web component for building SPAs consisting of one topic with multiple
activities. Handles login, language selection, activity switching, menus etc.

You can install this component via npm:

```bash
npm i @dbp-toolkit/app-shell
```

## Usage

```html
<dbp-app-shell src="/example.topic.metadata.json"></dbp-app-shell>
<script type="module" src="node_modules/@dbp-toolkit/app-shell/dist/dbp-app-shell.js"></script>
```

## Attributes

- `lang` (optional, default: `de`): set to `de` or `en` for German or English
    - example `<dbp-app-shell lang="de"></dbp-app-shell>`
- `src`: The path to a topic metadata file (json)
- `base-path` (optional, default: `/`): An absolute base path for routing
- `entry-point-url`: Entry point URL to access the API
- `keycloak-config`: An object with the following keys: url, realm, clientId, silentCheckSsoRedirectUri, scope
- `matomo-url` (optional): set to your *Matomo* server (required only for tracking)
    - example `<dbp-app-shell matomo-url="https://my-matomo.tld"></dbp-app-shell>`
- `matomo-site-id` (optional): set to your site id (required only for tracking)
    - example `<dbp-app-shell matomo-site-id="456789"></dbp-app-shell>`
- `no-welcome-page` (optional): skips the welcome page and welcome page isn't visible in menu
    - example `<dbp-app-shell no-welcome-page></dbp-app-shell>`

### Emitted attributes

The component emits `dbp-set-property` events for these attributes:

- `lang` to propagate a language change (possible values `en`, `de`)
- `requested-login-status` (possible values `logged-in`, `logged-out`)

### Emitted events

#### dbp-lang

The component emits a `dbp-lang` event when the language is changed (for example in the language picker).
The `details` attribute of the event is the language (possible values `en`, `de`).

### Slots

You can give your slots a css class `slot-hidden` (which you have to define with `.slot-hidden { display: none; }`) to
hide the slots while the app shell is loading. This css class will then be removed from the slots by the app shell.

#### Unnamed slot

The unnamed slot will be removed when the application is loaded and can be filled with a loading-spinner.

Example: `<app-shell><dbp-loading-spinner></dbp-loading-spinner></app-shell>`

#### name

The content of this slot will be shown left in the header and can be used to set a name (e.g. the name of the institution).

Example: `<app-shell><div slot="name">TU Graz<br />Graz University of Technology</div></app-shell>`

#### logo

The content of this slot will be shown right in the header and can be used to override the logo image.

Example: `<app-shell><div slot="logo"><img alt="logo" src="/path/to/logo.png" /></div></app-shell>`

#### header

The content of this slot will override the whole content of the header.
You will need to provide your own language selector and auth component.

Example: `<app-shell><div slot="header">My custom header</div></app-shell>`

#### footer-links

The content of this slot will override the whole content of the footer link section, for example to set custom links.

Example: `<app-shell><div slot="footer-links"><a target="_blank" rel="noopener" class="int-link-external" href="https://my-webpage.com">Link text</a></div></app-shell>`

#### footer

The content of this slot will override the whole content of the footer, for example to set custom links
and also overwrite the `dbp-build-info` tag.

Example: `<app-shell><div slot="footer"><a target="_blank" rel="noopener" class="int-link-external" href="https://my-webpage.com">Link text</a></div></app-shell>`

## Topic Metadata

```json
{
  "name": {
    "de": "Beispiel",
    "en": "Example"
  },
  "short_name": {
    "de": "Beispiel",
    "en": "Example"
  },
  "description": {
    "de": "Ich bin eine Beschreibung der Applikation",
    "en": "I am a description of this application"
  },
  "routing_name": "example",
  "activities": [
    {"path": "example.metadata.json", "visible": true}
  ],
  "attributes": []
}
```

## Activity Metadata

```json
{
  "element": "dbp-activity-example",
  "module_src": "dbp-activity-example.js",
  "routing_name": "activity-example",
  "name": {
    "de": "Beispielaktivität",
    "en": "Example Activity"
  },
  "short_name": {
    "de": "Beispielaktivität",
    "en": "Example Activity"
  },
  "description": {
    "de": "Eine Beschreibung",
    "en": "A Description"
  }
}
```

## Local development

```bash
# get the source
git clone git@gitlab.tugraz.at:dbp/web-components/toolkit.git
cd toolkit/packages/app-shell

# install dependencies
yarn install

# constantly build dist/bundle.js and run a local web-server on port 8002 
yarn run watch

# run tests
yarn test

# build local packages in dist directory
yarn run build
```

Jump to <http://localhost:8002> and you should get a Single Sign On login page.