动态选择框

Question

我的问题是我在一个页面中有太多的选择框，等待ajax响应非常慢。有效的方法是什么？感谢。

查看

<div class="item">
 <%= collection_select :categorization, :classification_id, Classification.all, :id, :name %>
 <%= select :categorization, :category_id %>   
</div>
<div class="item">
 <%= collection_select :categorization, :classification_id, Classification.all, :id, :name %>
 <%= select :categorization, :category_id %>   
</div>

#goes on...

的application.js

$("#categorization_classification_id").change( function() {
$.get("/get-categories", { classification_id: $(this).val() }, null, "script" );  
}); 

控制器

def get_categories
 @categories = Category.where("classification_id = ?", params[:classification_id])
 respond_to do |format|
  format.js
 end    
end 

get_categories.js.erb

$("#categorization_category_id").html('<%= raw escape_javascript(options_for_select(@categories.map {|sc| [sc.name, sc.id]}).gsub(/\n/, '')) %>');