Popups don't support showing related table records at this time. It's something we're considering for the future, however. You have to add the attributes to the shapefile, which won't really support one to many.
Thanks,
Mike
What about placing multiple points, one on top of another, to represent the "many" side of the relationship? The pop-up on the ArcGIS Online map should retrieve all of the point records with a single click. Not a clean solution but perhaps a workaround.
ESRI is terribly slow at getting useful functionality in place. ArcGIS Online has been around for quite a while yet we still don't have something as common as support for one to many relationships.
What about placing multiple points, one on top of another, to represent the "many" side of the relationship? The pop-up on the ArcGIS Online map should retrieve all of the point records with a single click. Not a clean solution but perhaps a workaround.
ESRI is terribly slow at getting useful functionality in place. ArcGIS Online has been around for quite a while yet we still don't have something as common as support for one to many relationships.