php - javascript - add form input based on selected dropdown -

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this first time working javascript , looking @ jquery , wasn't sure for. in past have submitted form , used & post variables create correct table project bit more complex , have dynamic form.

what i'm trying add additional table rows for cpu, ram , hdd based on case , motherboard selected. data being returned json api.

i'm not looking free coding, need pointed in right direction.

screenshot:

try jquery append add new data cpu, ram , hdd drop downs.

http://api.jquery.com/append/


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