thingspeak/app/views/channels/_edit.html.erb

<div class="FL">

  <%= form_for @channel, :html => {:method => 'put'} do |c| %>
   <% unless session[:errors].nil?
      session[:errors].each do |attr, msg|
        @channel.errors.add(attr, msg)
      end
      session[:errors] = nil %>
   <% end %>

    <p>
      <%= error_messages_for 'channel', :header_message => t(:try_again), :message => t(:channel_error) %>
    </p>
    <input name='userlogin' class='userlogin' />
    <table class="table_no_header">
      <tr>
        <td class="left"><%= t(:channel_ranking) %></td>
        <td><%= @channel.ranking %>%</td>
      </tr>
      <tr>
        <td class="left"><%= t(:channel_id) %></td>
        <td><%= @channel.id %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:channel_name) %></td>
        <td><%= c.text_field :name %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:channel_description) %></td>
        <td><%= c.text_area :description, :cols => 30, :rows => 4 %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:metadata).capitalize %></td>
        <td><%= c.text_area :metadata, :cols => 30, :rows => 4 %></td>
      </tr>
      <%= fields_for :tags do |t| %>
        <tr>
          <td class="left"><%= t(:tags) %></td>
          <td><%= t.text_area :name, :cols => 30, :rows => 2, :value => @channel.list_tags %></td>
        </tr>
      <% end %>
      <tr>
        <td class="left"><%= t(:latitude) %></td>
        <td><%= c.text_field :latitude %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:longitude) %></td>
        <td><%= c.text_field :longitude %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:elevation) %></td>
        <td><%= c.text_field :elevation %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:public) %></td>
        <td><%= c.check_box :public_flag %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:channel_url) %></td>
        <td><%= c.text_field :url %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:video_id) %></td>
        <td >
      <%= c.text_field :video_id, :class=>'video_narrow'%>
      <%= c.radio_button :video_type, 'youtube' %>
      <span class="small"><%= t(:youtube) %></span>
      <%= c.radio_button :video_type, 'vimeo' %>
      <span class="small"><%= t(:vimeo) %></span>
        </td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 1</td>
        <td><%= c.text_field :field1, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 2</td>
        <td><%= c.text_field :field2, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 3</td>
        <td><%= c.text_field :field3, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 4</td>
        <td><%= c.text_field :field4, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 5</td>
        <td><%= c.text_field :field5, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 6</td>
        <td><%= c.text_field :field6, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 7</td>
        <td><%= c.text_field :field7, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"><%= t(:field) %> 8</td>
        <td><%= c.text_field :field8, :class => 'field' %></td>
      </tr>
      <tr>
        <td class="left"></td>
        <td><%= c.submit t(:save_model, model: 'Channel'), class: 'btn btn-primary' %></td>
      </tr>
    </table>
  <% end %>

  <br><br>

  <h4><%= t(:channel_clear_message) %></h4>
  <%= button_to t(:channel_clear), "/channels/#{@channel.id}/clear", :data => { :confirm => t(:confirm_channel_clear) }, class: 'btn btn-danger' %>

  <br><br>

  <h4><%= t(:channel_delete_message) %></h4>
  <%= button_to t(:delete_model, model: 'Channel'), channel_path(@channel.id), :method => 'delete', :data => { :confirm => t(:confirm_channel_delete) }, class: 'btn btn-danger' %>
</div>
<div id="sidebar_old">
<ul>
    <li>
      <h2><%= t(:help) %></h2>
      <%= t(:help_channel_public) %>
      <br><br>
      <%= t(:help_channel_url) %>
      <br><br>
      <%= t(:help_channel_video) %>
      <br><br>
      <%= t(:help_channel_fields) %>
      <br><br>
      <%= t(:help_channel_clear) %>
      <br><br>
      <%= t(:help_channel_ranking) %>
      <br><br>
    </li>
  </ul>
</div>
<script type="text/javascript">
  // remember default field label
  var default_label = '<%= t(:channel_default_field) %>';
  // when document is ready
  $(document).on('page:load ready', function() {
    // iterate through each field textbox
    $('.field').each(function() {
      // if a value is present, show the 'remove' checkbox
      if ($(this).val()) {
        $(this).after('<span class="small" id="span_' + $(this).attr('id') + '"><input type="checkbox" onclick="removeField(\'' + $(this).attr('id') + '\')"  /><span class="up2">remove field</span></span>');
      // else disable
      } else {
        $(this).after('<span class="small" id="span_' + $(this).attr('id') + '"><input type="checkbox" onclick="addField(\'' + $(this).attr('id') + '\')"  /><span class="up2">add field</span></span>');
      }
    });

  });

  // adds a field
  function addField(id) {
    $('#span_'+id).remove()
    $('#'+id).val(default_label + ' ' + id.substring(id.length-1));
    $('#'+id).after('<span class="small" id="span_' + id + '"><input type="checkbox" onclick="removeField(\'' + id + '\')"  /><span class="up2">remove field</span></span>');
    $('#'+id).select();
  }

  // removes a field
  function removeField(id) {
    $('#span_'+id).remove();
    $('#'+id).val('');
    $('#'+id).after('<span class="small" id="span_' + id + '"><input type="checkbox" onclick="addField(\'' + id + '\')"  /><span class="up2">add field</span></span>');
  }
</script>