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A depending input field, without links is not possible unfortunately.
The city table implementation delivers by default a list of zipcodes with city visible, so the "drop down" / resultlist would contain zipcode and city and can then be selected and populating the desired fields.
If you want to have a 2-step selection, the only way I can think of would be to have a city table, related to a postal code table, where every city table entry has the postal code parent linked (duplicating the cities as often as there are postal codes). In that case, you could select the postal code and in the second input field (also a link), you can reference this first selected postal code record and only see the subset.
Thanks, Alexander Justin could help us -- seemed to be tricky, espescially the combination zip/town AND street