The Search widget in Web AppBuilder for ArcGIS does not update to the newly added geocoder in an existing application when one of the existing geocoders is deleted from the application before the new geocoder is added.
This issue is no longer reproducible after the September 2016 update of ArcGIS Online.
解决办法
1. Click the edit icon for the Search widget.
2. Remove all existing geocoders.
3. Click OK, and save the Web AppBuilder application.
4. Click the edit icon for the Search widget, and all the geocoders are displayed, including the deleted geo