Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 
  • Form Helpers in Rails Part-3 (Customization and Forms for External Resources)

    • 0
    • 1
    • 1
    • 1
    • 0
    • 0
    • 0
    • 0
    • 194
    Comment on it

    Hi friends,
    Previously we talked about form helpers dealing with models in Form Helpers in Rails Part-2. Today we will continue with Form Builders Customizations.
    As we already discussed that objects from form_for and fields_for are instance of FormBuilder class. In addition to that you can also subclass FormBuilder and add the helpers there. For example if previously you have written :

    <%= form_for @blog do |f| %>
      <%= text_field_with_label f, :title %>
    <% end %>
    


    You can write this as:

    <%= form_for @blog, builder: LabelBuilder do |f| %>
      <%= f.text_field :title %>
    <% end %>
    
    #Define Class LabelBuilder as:
    class LabelBuilder < ActionView::Helpers::FormBuilder
      def text_field(attribute, options={})
        label(attribute) + super
      end
    end
    


    If you require to use it again and again you can also define labeled_form_for that is related to builder: LabelBuilder. So now if you do

    <%= render partial: f %>
    


    It will render labelling_form, if 'f' is an instance of class LabelBuilder or FormBuilder will be rendered, if it is an instance of that.


    Forms to External Resource:
    So many times, we need to send the request to external resources like payment gateways etc. In that case we need to set authenticity_token to the form_tag. If the fields are limited by the third party, then you can set authenticity_token to false, for not generating it. Examples are given below:

    <%= form_tag 'http://external-url/form', authenticity_token: 'external-token' do %>
      Form contents
    <% end %>
    
    #Setting authenticity_token false
    <%= form_tag 'http://external-url/form', authenticity_token: false do %>
      Form contents
    <% end %>
    
    #Same can be used for form_for
    <%= form_for @payment, url: external-url, authenticity_token: 'external-token' do |f| %>
      Form contents
    <% end %>
    


    We will be dealing with complex forms in the next part. To go the next part. Click on the link below:
    Form Helpers in Rails Part-4

 0 Comment(s)

Sign In
                           OR                           
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: