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)

    @raghvendra.singh
    Recommendations Offline Message

    • 0
    • 1
    • 1
    • 1
    • 0
    • 0
    • 0
    • 0
    • 545
    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 : 

    1. <%= form_for @blog do |f| %>
    2.   <%= text_field_with_label f, :title %>
    3. <% end %>


    You can write this as:

    1. <%= form_for @blog, builder: LabelBuilder do |f| %>
    2.   <%= f.text_field :title %>
    3. <% end %>
    4.  
    5. #Define Class LabelBuilder as:
    6. class LabelBuilder < ActionView::Helpers::FormBuilder
    7.   def text_field(attribute, options={})
    8.     label(attribute) + super
    9.   end
    10. 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 

    1. <%= 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:

    1. <%= form_tag 'http://external-url/form', authenticity_token: 'external-token' do %>
    2.   Form contents
    3. <% end %>
    4.  
    5. #Setting authenticity_token false
    6. <%= form_tag 'http://external-url/form', authenticity_token: false do %>
    7.   Form contents
    8. <% end %>
    9.  
    10. #Same can be used for form_for
    11. <%= form_for @payment, url: external-url, authenticity_token: 'external-token' do |f| %>
    12.   Form contents
    13. <% 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

    Rails Form Helpers Ruby on Rails
    Comment on it

 0 Comment(s)

Sign In
Forgot Password?
                           OR                           
Create an account !!
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Reset Password
Fill out the form below and reset your password: