从属下拉列表仅适用于表中的单行

Hi I've created a dependent drop for my page. I have html table."parent_cat" is my first dropdown and "sub_cat" is my second one Inside this my 2nd dropdown appears. I'm facing a problem where dropdrown works perfectly fine for first row but doesnt work for rest of rows. I'm attaching the code.Hi I've created a dependent drop for my page. I