Rails 4 get value from text_field_tag that contains javascript var

I'm migrating from rails 2.3.10 to rails 4, and I have a app for send message on cellphone to patient schedule. My app show a list of schedule's patient and for each line exist a check_box_tag, when I select one or more and send message. So I have a form that call a partial and this partial contains a list with check_box_tag. Each check box selected is storage on javascript variable selected_ids and return on text_field_tag in the main form. The problem is on event link_to the parameter selected_ids is empty, but I can see on the check_box_tag Below part of form, partial and javascript:

function MultiSelectIDs(FieldName) {
        var selected_ids = new Array()
        var objCheckBoxes = document.getElementsByName(FieldName);
        for(var i = 0; i < objCheckBoxes.length; i++){
                if (objCheckBoxes[i].checked) {
                        var x = selected_ids.splice(selected_ids.length,0, objCheckBoxes[i].id);
                }
        }
        document.getElementById('selected_ids').value = selected_ids.join(", ")
};

<% if !@tagendamento.blank? && !@tagendamento.nil? %>
  <% for tagendamento in @tagendamento do %>
  <tr>
  <%= check_box_tag "#{tagendamento.id}", 0, false, :name=> "chk_agendamento", :onclick => "MultiSelectIDs('chk_agendamento')" %>
<% end %>
  
  
<%= text_field_tag :selected_ids %>
<%= link_to 'Pré-Visualizar SMS',send_sms_queries_path(:sel_ids=>params[:selected_ids],:perfil=>params[:perfil], :visualizar => '1', :dt_envio=>(params[:dt_envio].nil?)? (Date.today - 3) : params[:dt_envio],:t_envio=>params[:t_envio],:tipo_msg=>params[:tipo_msg],:mensagem=>(!params[:mensagem].nil? and !params[:mensagem].blank?)? params[:mensagem] : @standard,:selec_tipotemplate_sms=>params[:selec_tipotemplate_sms],:date_agend_hc=>params[:date_agend_hc]), :target=>'_blank', :style =>     "color:black"%>

    <%= text_field_tag :selected_ids %>
    <%= link_to 'Pré-Visualizar SMS', send_sms_queries_path(:sel_ids        =>  params[:selected_ids],
                                                            :perfil         =>  params[:perfil],
                                                            :visualizar     =>  '1',
                                                            :dt_envio       => (params[:dt_envio].nil?)? (Date.today - 3) : params[:dt_envio],
                                                            :t_envio        =>  params[:t_envio],
                                                            :tipo_msg       =>  params[:tipo_msg], 
                                                            :mensagem       => (!params[:mensagem].nil? and !params[:mensagem].blank?)? params[:mensagem] : @standard,
                                                            :selec_tipotemplate_sms =>  params[:selec_tipotemplate_sms], 
                                                            :date_agend_hc  =>  params[:date_agend_hc]), 
                                    :target =>  '_blank', 
                                    :style  =>  "color:black"%>