Function sortListBy

sortListBy(sortBy): void
JMap.MapContext.sortListBy

Changes the map-context list sort. The change is persited in local storage.

"alphabetic" : list following map context title string "lastUpdate" : list following map context last update
Parameters
- sortBy: JMAP_CONTEXT_SORT_BY_OPTIONS
  "alphabetic" or "lastUpdate"
Returns void
Throws
if sortBy param is not correct

Example
```
// sort the list alphabetically
JMap.MapContext.sortListBy("alphabetic")

// sort the list with the last upadte date
JMap.MapContext.sortListBy("lastUpdate")
```