Get data from other field in a same page

guys, I need your help
Is there any references that can help me if I have value in a field selected that can show data where that field selected
for example, there are 2 table states and cities
in states, there are data like Japan, Indonesia, China, and other
but when I choose Japan will only show data Japan’s city in the city field select box
thank you

There are many tutorials on dependent drop downs. A Google search for city state dependent drop down should show many results.

Edit: Normally this is done with ajax.

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