javascript - Change select button on selection of another select button -


i beginner. dont know ajax. in project using jsp front end tool , mysql end. want change select button when select button value changes.

for example suppose have table course , subject

table:course

cid    course  1       mca  2       bca  3       bsc mathematics

table:subject

sid    subject   scode    cid  1       se      mca01     1  1       sad     mca02     1  3       se      bca01     2  4       java    bca05     2

i want display subjects se , java when bca selected select box.


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