Routing with form_tag - ruby-on-rails

Question

Now I am trying to set a form on the page of index.html.erb(members). I want the form to show the result of searching and want it not to move to other pages. I want to show the result on index.html.erb(members) itself.
But the code below makes the application move to show.html(members) after pushing the search button. I have no idea why this happens. Could you give me some advice?
Now I am trying to set search window based on my textbook. But I failed with the error message below. I don't understand the cause although this is just a syntax error. Could you give me some advice?
☆index.html.erb(members controller)
<h1>Listing users</h1>
<p>※登録されているメンバーのリストです。</p>
<%= form_tag :action => 'index' do %>
<div class = "field">
<%= label_tag 'place', '活動場所：'　%><br />
<%= text_field_tag 'place' %>
</div>
<%= submit_tag '検索' %>
<% end %>
<%= #places_field %>
☆members controller
def index
if !checklogin? then return end #
#members = Member.all
#places_field = Member.where("place = ?", params[:place])
respond_to do |format|
format.html # index.html.erb
format.json
end
end
☆routes.rb
MiniSNS::Application.routes.draw do
resources :group_message_comments
resources :group_messages do
resources :group_message_comments
end
root :to => 'members#login'
match '/groups/join'
resources :group_messages
resources :groups do
resources :group_messages
end
match '/members/new'
resources :index
resources :groups
post 'groups/:id' => 'group#show'
post '/groups/new'
post '/index/index'
match '/members/login'
match '/members/logout'
match '/members/friend'
match '/members/show'
post '/messages/comment'
resources :comments
resources :messages
resources :friends
resources :members
#OmniAuth
match "/auth/:provider/callback" => "sessions#callback"
match "/logout" => "sessions#destroy", :as => :logout
match '/auth/failure', to: redirect('/')

Answer 1

First, you have to adding remote => true on your submit_tag like:
<%= submit_tag '検索', :remote => true %>
Then on your controller, adding return to js with:
respond_to do |format|
format.html # index.html.erb
format.json
format.js
end
Create new view called index.js.erb and fill that file with Javascript code to update your place field, the simplest way is like:
On index.html.erb make sure you have this kind of code:
<div id="place_field_section"><%= render 'place_field' %></div>
Of course you should have a partial called _place_field.html.erb for example:
<table>
<tr>
<th>Foo</th>
<th>Bar</th>
</tr>
<% #place_fields.each do |place_field| %>
<tr>
<td><%= place_field.foo %></td>
<td><%= place_field.bar %></td>
</tr>
<% end %>
</table>
then on your index.js.erb:
$("#place_field_section").html("<%= escape_javascript(render('place_field')) %>");
Is this what you intent to? Please correct me if I'm wrong.