Function popupOpened

popupOpened(listenerId, fn): void
JMap.Event.MouseOver.on.popupOpened

This event is triggered when the popup has been opened.
Parameters
- listenerId: string
  Your listener id (must be unique for all mouseover events)
- fn: ((params) => void)
  Your listener function
  - - (params): void
    - Parameters
      params: JMouseOverEventParams
      Returns void
Returns void
Example
```
// Each time the mouseover popup is displayed
JMap.Event.MouseOver.on.popupOpened("my-listener", params => {
  console.log("Mouseover popup has been opened", params.content)
})
```