Function getByLayerId

getByLayerId(layerId): JDynamicFilter
JMap.Layer.DynamicFilter.getByLayerId

Returns the dynamic filter of a given layer id
Parameters
- layerId: JId
  The JMap layer id
Returns JDynamicFilter
Throws
Error if layer is not found

Example
```
// returns the filter of layer id=3
const filter = JMap.Layer.DynamicFilter.getByLayerId(3)
console.log(filter)
```