Adding additional fields dynamically to a rails form

Question

Seeing some tutorials I tried to build some nested forms with option to add fields dynamically when a add button is clicked. I am completely new here and finding it difficult to solve the problem as my code does not work , neither it gives any error ! Here is the form

<%= form_for [@project, @feature], class: "form-group inline", remote: true  do |builder| %>

    <%= builder.fields_for :tasks, remote: true do |form| %>
      <%= render "task_fields", f: form %>
    <% end %>

    <%= link_to_add_fields "Add Field", builder, :tasks %>

    <%= builder.submit class: "btn btn-primary m-2" %>

<% end %>

And the Application helper method link_to_add_fields is->

  def link_to_add_fields(name, f, association)
    new_object = f.object.send(association).klass.new
    id = new_object.object_id
    fields = f.fields_for(association, new_object, child_index: id) do |builder|
      render(association.to_s.singularize + "_fields", f: builder)
    end
    link_to(name, '#', class: "add_fields", data: {id: id, fields: fields.gsub("\n", "")})
  end

And the js code is ->

$(document).on 'click', 'form .add_fields', (event) ->
  time = new Date().getTime()
  regexp = new RegExp($(this).data('id'), 'g')
  $(this).before($(this).data('fields').replace(regexp, time))
  event.preventDefault()

The problem is there shows no error but does nnothing(only performs the href="#" action). How can I achieve the functionality such that I can add fields dynamically to nested form

Answer 1

It was actually only for those dependencies in application.js

//= require jquery
//= require jquery_ujs