Best way to render/load dependent fields using AJAX

Hi there,

What would be the best way to load and unload dependent field.

For an instance, I have 3 fields on the form: class, division,
section.

If my class is A or B, then I also need to fill up division and
section.

Assume that class is a dropdown and a mandatory field. Whenever I
change the value of class, broswer sends an AJAX request. Based on the
value of class server send back HTML and gets loaded on a
placeholder(DIV).

If value was A or B, it will send fields for division and section else
nothing.

This was just a simple example. I have got around 192 fields and 42
fields doesn't show up until some fields gets changed. It gets
complicated, every day when I try to add a new field. And Edit view
becomes more complicated because it has to analyze if the value class
is A or B, if yes, render division and section.

I am going crazy, please suggest me the best way to handle this
situation. I am ready to do it from scratch.

Thank you in advance.

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