Updating my filter selects not working... why is that?

products.js

$(document).ready(function(){
  selectionChanges();
});

function selectionChanges(){
  $('#filters select').change(function(){
    //Do some stuff and do an ajax request
  });
}

products_controller.rb

def show
  #Do some things here
  @properties
  @newproperties
  
  #Respond with the right format
  respond_to do |format|
    format.html
    format.js
  end
end

show.js.erb

$('#filters').html('<%= escape_javascript(render :partial => "filterselect2") %>');
selectionChanges();