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# API Room functions Reference
### Working with group layers
If you use group layers in your map, to reference a layer in a group you will need to use a `/` to join layer names
together.
Example :
The name of the layers of this map are :
- `entries/start`
- `bottom/ground/under`
- `bottom/build/carpet`
- `wall`
### Detecting when the user enters/leaves a layer
```
WA.room.onEnterLayer(name: string): Subscription
WA.room.onLeaveLayer(name: string): Subscription
```
Listens to the position of the current user. The event is triggered when the user enters or leaves a given layer.
- **name**: the name of the layer who as defined in Tiled.
Example:
```ts
const myLayerSubscriber = WA.room.onEnterLayer("myLayer").subscribe(() => {
WA.chat.sendChatMessage("Hello!", "Mr Robot");
});
WA.room.onLeaveLayer("myLayer").subscribe(() => {
WA.chat.sendChatMessage("Goodbye!", "Mr Robot");
myLayerSubscriber.unsubscribe();
});
```
### Show / Hide a layer
```
WA.room.showLayer(layerName : string): void
WA.room.hideLayer(layerName : string) : void
```
These 2 methods can be used to show and hide a layer. if `layerName` is the name of a group layer, show/hide all the
layer in that group layer.
Example :
```ts
WA.room.showLayer("bottom");
//...
WA.room.hideLayer("bottom");
```
### Set/Create properties in a layer
```
WA.room.setProperty(layerName : string, propertyName : string, propertyValue : string | number | boolean | undefined) : void;
```
Set the value of the `propertyName` property of the layer `layerName` at `propertyValue`. If the property doesn't exist,
create the property `propertyName` and set the value of the property at `propertyValue`.
Note :
To unset a property from a layer, use `setProperty` with `propertyValue` set to `undefined`.
Example :
```ts
WA.room.setProperty("wikiLayer", "openWebsite", "https://www.wikipedia.org/");
```
### Get the room id
```
WA.room.id: string;
```
The ID of the current room is available from the `WA.room.id` property.
{.alert.alert-info} You need to wait for the end of the initialization before accessing `WA.room.id`
```typescript
WA.onInit().then(() => {
console.log("Room id: ", WA.room.id);
// Will output something like: 'https://play.workadventu.re/@/myorg/myworld/myroom', or 'https://play.workadventu.re/_/global/mymap.org/map.json"
});
```
### Get the map URL
```
WA.room.mapURL: string;
```
The URL of the map is available from the `WA.room.mapURL` property.
{.alert.alert-info} You need to wait for the end of the initialization before accessing `WA.room.mapURL`
```typescript
WA.onInit().then(() => {
console.log("Map URL: ", WA.room.mapURL);
// Will output something like: 'https://mymap.org/map.json"
});
```
### Getting map data
```
WA.room.getTiledMap(): Promise
```
Returns a promise that resolves to the JSON map file.
```ts
const map = await WA.room.getTiledMap();
console.log("Map generated with Tiled version ", map.tiledversion);
```
Check
the [Tiled documentation to learn more about the format of the JSON map](https://doc.mapeditor.org/en/stable/reference/json-map-format/)
.
### Changing tiles
```
WA.room.setTiles(tiles: TileDescriptor[]): void
```
Replace the tile at the `x` and `y` coordinates in the layer named `layer` by the tile with the id `tile`.
If `tile` is a string, it's not the id of the tile but the value of the property `name`.
`TileDescriptor` has the following attributes :
- **x (number) :** The coordinate x of the tile that you want to replace.
- **y (number) :** The coordinate y of the tile that you want to replace.
- **tile (number | string) :** The id of the tile that will be placed in the map.
- **layer (string) :** The name of the layer where the tile will be placed.
**Important !** : If you use `tile` as a number, be sure to add the `firstgid` of the tileset of the tile that you want
to the id of the tile in Tiled Editor.
Note: If you want to unset a tile, use `setTiles` with `tile` set to `null`.
Example :
```ts
WA.room.setTiles([
{ x: 6, y: 4, tile: "blue", layer: "setTiles" },
{ x: 7, y: 4, tile: 109, layer: "setTiles" },
{ x: 8, y: 4, tile: 109, layer: "setTiles" },
{ x: 9, y: 4, tile: "blue", layer: "setTiles" },
]);
```
### Loading a tileset
```
WA.room.loadTileset(url: string): Promise
```
Load a tileset in JSON format from an url and return the id of the first tile of the loaded tileset.
You can create a tileset file in Tile Editor.
```ts
WA.room.loadTileset("Assets/Tileset.json").then((firstId) => {
WA.room.setTiles([{ x: 4, y: 4, tile: firstId, layer: "bottom" }]);
});
```
## Embedding websites in a map
You can use the scripting API to embed websites in a map, or to edit websites that are already embedded (using
the ["website" objects](website-in-map.md)).
### Getting an instance of a website already embedded in the map
```
WA.room.website.get(objectName: string): Promise
```
You can get an instance of an embedded website by using the `WA.room.website.get()` method. It returns a promise of
an `EmbeddedWebsite` instance.
```ts
// Get an existing website object where 'my_website' is the name of the object (on any layer object of the map)
const website = await WA.room.website.get("my_website");
website.url = "https://example.com";
website.visible = true;
```
### Adding a new website in a map
```
WA.room.website.create(website: CreateEmbeddedWebsiteEvent): EmbeddedWebsite
interface CreateEmbeddedWebsiteEvent {
name: string; // A unique name for this iframe
url: string; // The URL the iframe points to.
position: {
x: number, // In "game" pixels, relative to the map or player coordinates, depending on origin
y: number, // In "game" pixels, relative to the map or player coordinates, depending on origin
width: number, // In "game" pixels
height: number, // In "game" pixels
},
visible?: boolean, // Whether to display the iframe or not
allowApi?: boolean, // Whether the scripting API should be available to the iframe
allow?: string, // The list of feature policies allowed
origin: "player" | "map" // The origin used to place the x and y coordinates of the iframe's top-left corner, defaults to "map"
scale: number, // A ratio used to resize the iframe
}
```
You can create an instance of an embedded website by using the `WA.room.website.create()` method. It returns
an `EmbeddedWebsite` instance.
```ts
// Create a new website object
const website = WA.room.website.create({
name: "my_website",
url: "https://example.com",
position: {
x: 64,
y: 128,
width: 320,
height: 240,
},
visible: true,
allowApi: true,
allow: "fullscreen",
origin: "map",
scale: 1,
});
```
### Deleting a website from a map
```
WA.room.website.delete(name: string): Promise
```
Use `WA.room.website.delete` to completely remove an embedded website from your map.
### The EmbeddedWebsite class
Instances of the `EmbeddedWebsite` class represent the website displayed on the map.
```typescript
class EmbeddedWebsite {
readonly name: string;
url: string;
visible: boolean;
allow: string;
allowApi: boolean;
x: number; // In "game" pixels, relative to the map or player coordinates, depending on origin
y: number; // In "game" pixels, relative to the map or player coordinates, depending on origin
width: number; // In "game" pixels
height: number; // In "game" pixels
origin: "player" | "map";
scale: number;
}
```
When you modify a property of an `EmbeddedWebsite` instance, the iframe is automatically modified in the map.
{.alert.alert-warning} The websites you add/edit/delete via the scripting API are only shown locally. If you want them
to be displayed for every player, you can use [variables](api-start.md) to share a common state between all users.
