Function selectabilityWillChange

selectabilityWillChange(listenerId, fn): void
JMap.Event.Layer.on.selectabilityWillChange

This event is triggered just before a vector layer selectability is changed. This permits to act on selection before the layer selectability property is effectively changed
Parameters
- listenerId: string
  Your listener id (must be unique for all layer events)
- fn: ((params) => void)
  Your listener function
  - - (params): void
    - Parameters
      params: JLayerEventSelectabilityParams
      Returns void
Returns void
Example
```
// Each time a vector layer selectability will change, it will display the next selectability
// in the console
JMap.Event.Layer.on.selectabilityWillChange(
   "custom-selectability-will-change",
   params => {
     console.log(`Vector layer id="${params.layerId}" next selectability="${params.selectability}"`)
   }
)
```