[英]Ruby on Rails 2 Drop Down Menus Want Validation of Selection Pre-Controller
I have a ruby on rails app that has a form. 我有一个表单的ruby on rails应用程序。 I was wondering if there is a way to make sure that a user has selected drop down menu items in both of the drop downs on this form before it is submitted and params are generated.
我想知道是否有一种方法可以确保用户在提交表单和生成参数之前,已经在该表单的两个下拉菜单中选择了下拉菜单项。 Ideally I would like to throw and error warning them to pick 1 item on each of the drop downs and re-render the form.
理想情况下,我想抛出错误并警告他们在每个下拉菜单中选择1个项目,然后重新呈现表单。
The form is below: 表格如下:
<%= form_tag compare_products_path, method: :get do |f| %>
<%= select_tag :product_id1, options_from_collection_for_select(@products, 'id', 'name') %>
<%= select_tag :product_id2, options_from_collection_for_select(@products, 'id', 'name') %>
<%= f.submit %>
<% end %>
Please let me know how I can accomplish what I stated above. 请让我知道我如何完成上述要求。
SIDENOTE: I also implemented Select2 to make the form look nicer but could not find out of there is a quick validation trick in Select2 to accomplish what I said above, if there is a suggestion for that I can post the Select2 version, 旁白:我还实现了Select2来使表单看起来更好,但在Select2中没有一个快速验证技巧可以完成我上面所说的内容,如果有建议可以发布Select2版本,
Try this: 尝试这个:
<%= select_tag :product_id1, options_from_collection_for_select(@products.where.not(:name=>nil), 'id', 'name'), :include_blank => "Please select...",:required=>true %>
<%= select_tag :product_id2, options_from_collection_for_select(@products.where.not(:name=>nil), 'id', 'name'), :include_blank => "Please select..." ,:required=>true %>
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