Ruby on Rails

Hi everyone! A few days I can't resolve a task. I want to build a single
page app without any page refresh. So I have a button 'Add', onclick it
inserts in a DOM a simple remote:true form and when I try to submit this
form - nothing happens BUT if i refresh the page - it works. Guess some
handler is absent but not sure. Advise please. Here's my form
<%= form_tag(:add_task, method: 'post', remote: true) do %>
<td>
<span class="glyphicon glyphicon-plus"></span>
</td>
<td>
<%= text_field(:task,:project_id,type: 'hidden',value:
@project.id)%>
<%= text_field(:task,:name,class: 'form-control
task_field', placeholder: 'Start typing here to create a task...')%>
</td>
<td>
<%= button_tag('Add task',class:'btn btn-add_task') %>
</td>
<% end %>

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