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erik216 -1 Newbie Poster

I want to make two dropdown list A and B
dropdownlist A include a , b , c , d

When dropdown list A selected A
There will be show 1,2,3 in dropdown list B
When dropdown list A selected B
There will be show 4,5,6 in dropdown list B

Also when I select 5 in dropdown list B
It will show 5 in a textfield.

How can I use ajax to process it?
Can anyone give me some example?

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