CODEWITHSUNDEEP
javascriptjqueryruby-on-railsformsnested-forms
Abdul Baig
Abdul Baig

Reputation: 3721

dynamically add fields to nested form onchange of select

i am adding and removing fields successfully on click to add_fields and remove_fields. But now i want to add fields N times at once depending on the value of drop down in the parent form. How to do it any idea? here is my parent form

= f.select :total_section, (0..10),{}, :onchange => "generate_form(this.value)"
    .field
      = f.fields_for :score_sheet_sections do |s|
        %div.fields
          = render 'score_sheet_section_fields', :f => s
      %div.fields
        = link_to_add_fields "Add Score Sheet Sections", f, :score_sheet_sections

In my generate form function i only have this:

function generate_form(number) {
      for (i = 1; i <= number; i++) {
          console.log(i);
      }
  }

i want to select number of sections(say N or store it in N) and then add score_sheet_sections N times

Upvotes: 1

Views: 1227

Answers (2)

Richard Peck
Richard Peck

Reputation: 76774

select number of sections(say N or store it in N) and then add score_sheet_sections N times)

I don't know how you're handling this currently, but if you're using a similar method to this (I.E using Ajax to call a separate method) , you may wish to include an argument in the method which allows you to return the number of rows depending on the argument, like so:

--

Route

#config/routes.rb
resources :controller do
   collection do
      get :new_field
   end
end

--

Controller

#app/controllers/your_controller.rb
respond_to :js, only: :new_field

def new_field num = 1 #-> arg defaults to 1
   num = params[:num] if params[:num]

   @model = Model.new
   @model.nested_categories.build

   render "controller/form", num: num
end

#app/views/controller/new_field.html.erb
<%= form_for @model do |f| %>
    <%= render partial: "field", locals: { num: parmas[:num], f: f } %>
<% end %>

#app/views/controller/_field.html.erb
<% num.each do |i| %>
    <%= f.fields_for :association, child_index: Time.now.to_i do |a| %>
         <%= a.text_field :attribute %>
    <% end %>
<% end %>

--

** JS **

= f.select :total_section, (0..10),{}, :onchange => "generate_form(this.value)"

#app/assets/javascripts/application.js.erb
var generate_form = function( num ){
   $.ajax({
       url: "new_fields/?num=" + num,
       type: "GET",
       success: function(data) {
           //append returned data to view
       }          
   })
}
  • According to this SO post, you can append data to the URL in a GET request

This will return a built form to your ajax request, allowing you to parse it & append to the view

Upvotes: 2

Mohanraj
Mohanraj

Reputation: 4200

Just follow this railscasts tutorial to add and remove the nested resources fields http://railscasts.com/episodes/197-nested-model-form-part-2?view=asciicast, http://railscasts.com/episodes/196-nested-model-form-revised?view=comments.

If need more help please let me know.

Upvotes: 1

Related Questions