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lookup zip code

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  • lookup zip code


    I need the user to find a zip code from another table( T2) and insert it into the first table (T1). The T2 table can find the zip code by using the prvious input of the city name as the user fills in his form. BUT this lookup operation should only occur IF the country code on the form is left blank ! ( because I don't have a zip code table for every country ion the world...)
    So to resume:
    Fields: country, city, zip
    Tables: T1( contains the customer data) and T2 (contains the one country zip codes)
    Operations: fill in the country name, fill in the city name, if the country name is blank then lookup the city's zip code from T2 and drop it into the zip field from T1.

    Thanks for the help,


  • #2
    RE: lookup zip code

    Perhaps you could roll your own lookup in a script attached to the OnArrive event for the zipcode field. If country is blank, popup a form displaying the zips... You may want to limit the script so that it runs only when the table is in change or enter mode...

    -- tom


    • #3
      RE: lookup zip code


      I wouldn't recommend this method unless every city you deal with is really, really small. I just checked my zip code listing and Chicago, IL has about 80 zip codes; Detroit, MI has about 50; even Abilene, TX has 2. Add to this the fact that there are also cities called Detroit in Alabama, Illinois, Maine, Texas, and Oregon. Can you imagine the chances of getting the correct zip code if you simply look for "Detroit"? I live in Salem township which has about 2200 homes and at least 4 possible zip codes (3 are not Salem). I don't have zip code listings for other countries but I bet it's the same situation.

      It's much safer to lookup the city based on the zip code. If there is no chance of that, you should pop up the zipcode list and make the user try to figure out the correct listing. But, what would be the basis of the decision since most listings only have country(maybe), city, state, zip, and county(maybe).

      Even if you look up the city based on the zip code, you should be aware that this is only the city where the post office is located. The actual location could be somewhere else - I live 5 miles outside the city & county where my post office is located.


      • #4
        RE: lookup zip code

        Hi Cal,

        Thanks, but no, my country is Belgium ! Very small with no such complications.
        So my problem is only the script/event way of having the lookup list appear as a popup when the country field is blank.



        • #5
          RE: lookup zip code

          Thanks Tom,

          How does the zip code field get to be imported from the lookup table ?