[Rails] How can I update a div value using Ajax but calling a function on the OnChange?

Hey guys,

I'm trying to update a div with a result coming from a request to the
database.

So I have created this method on the controller

def retrieve_part_price
@price = Part.find(params[:id])
respond_to do |format|
format.html { redirect_to(items_path)}
format.js { render :nothing => true }
end
end

and added it to the routes properly, but I don't know how should I
call it from my view side to bring the value using Ajax.

any advice? blog post?

Thank you.

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