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Dynamic reaction caused by different selection

 
Joshua Cloch
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I am sure that a lot of us have met this nice process when registering our information:
suppose there are two categories left for us to choose;
one is "country",the other is the "city" of that country.
what happens here is:when we select the country,the "city" category can usually correspond to this selection,displaying the cities belonging to that selected country.

Anyone knows how to implement this?

Thanks very much!
 
Eric Pascarello
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It is called a double combo or linked selection lists.

Eric
 
Joshua Cloch
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Thanks very much,I'll try it.
 
It is sorta covered in the JavaRanch Style Guide.
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