Question

我正在关注动态下拉菜单Rail Cast tutorial。但它没有提供预期的输出。我如何知道js.erb文件中的方法是否正在运行？这是我的控制器

class JavascriptsController < ApplicationController
  def dynamic_states
      @countries= Country.all
      @venues= Venue.all
  end
end

我尝试放下拉菜单的地方。

<p>
  <label for="event_country_id">Country:</label>
  <%= f.collection_select :country_id, @countries, :id, :name, :prompt => "Select a Country" %>
</p>
<p id="state_field">
   <label for="event_venue_id">State or Province:</label>
   <%= f.collection_select :venue_id, @venues, :id, :place, :prompt => "Select a State" %>
</p>

这是我的架构

  create_table "countries", :force => true do |t|
  t.string   "name"
  t.datetime "created_at"
  t.datetime "updated_at"
end

create_table "events", :force => true do |t|
  t.string   "name"
  t.date     "start_at"
  t.date     "end_at"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "trainer_id"
  t.string   "venue_id"
  t.string   "description"
  t.boolean  "holy"
  t.integer  "nxt"
  t.string   "country_id"
end

create_table "trainers", :force => true do |t|
  t.string   "name"
  t.string   "email"
  t.integer  "contact_num"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "color"
end

  create_table "users", :force => true do |t|
  t.string   "name"
  t.string   "email"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "encrypted_password"
  t.string   "salt"
  t.string   "remember_token"
  t.boolean  "admin"
end

  create_table "venues", :force => true do |t|
  t.string   "country_id"
  t.string   "place"
  t.string   "color"
  t.datetime "created_at"
  t.datetime "updated_at"
end

这是我的dynamic_states.js.erb

var venues = new Array();
<% for venue in @venues %>
venues.push(new Array(<%= venue.country_id%>, '<%=h venue.place%>', <%= venue.id %>));
<% end %>
function countrySelected() {
alert("test")
country_id = $('event_country_id').getValue();
options = $('event_venue_id').options;
options.length = 1;
venues.each(function(venue) {
if (venue[0] == country_id) {
  options[options.length] = new Option(venue[1], venue[2]);
}
  });
if (options.length == 1) {
  $('state_field').hide();
} else
{
  $('state_field').show();
}
}

document.observe('dom:loaded', function() {
countrySelected();
  $('event_country_id').observe('change', countrySelected);
});

请有人解释为什么不工作？

如何查找javascript代码是否在rails 2.3.8上运行？

0 个答案: