Function setVisibilityById

setVisibilityById(layerId, thematicId, visibility): void
JMap.Layer.Thematic.setVisibilityById

Shows or hides a layer thematic on the map
Parameters
- layerId: JId
  The JMap layer id
- thematicId: JId
  The thematic id
- visibility: boolean
  true to show, false to hide
Returns void
Throws
Error if layer or thematic is not found

Example
```
// Display the thematic id=3 of layer id=7
JMap.Layer.Thematic.setVisibilityById(7, 3, true)

// Hide the thematic id=3 of layer id=7
JMap.Layer.Thematic.setVisibilityById(7, 3, false)
```