jQuery(function() {
  jQuery('#food_group_select').change(function() {
    foodGroupId = jQuery('option:selected', this).val();
    var foodSelect = jQuery('#food_select');
    foodSelect.removeOption(/\d/); /* remove all options with numeric values */
    for(var i = 0; i < foods.length; i++) {
      var food = foods[i];
      if (foodGroupId == '' || food.group == foodGroupId) foodSelect.addOption(food.id, food.name);
    }
    foodSelect.get(0).selectedIndex = 0;
  }).change();
  
  jQuery('#food_select').change(function() {
    this.form.submit();
  })
})