Padrino

Application Helpers

Form Builders

Form builders are full-featured objects allowing the construction of complex object-based forms using a simple, intuitive syntax.

A form_for using these basic fields might look like:

= form_for @user, '/register', :id => 'register' do |f|
  = f.error_messages
  %p
    = f.label :username, :caption => "Nickname"
    = f.text_field :username
  %p
    = f.label :email
    = f.text_field :email
  %p
    = f.label :password
    = f.password_field :password
  %p
    = f.label :is_admin, :caption => "Admin User?"
    = f.check_box :is_admin
  %p
    = f.label :color, :caption => "Favorite Color?"
    = f.select :color, :options => ['red', 'black']
  %p
    = fields_for @user.location do |location|
      = location.text_field :street
      = location.text_field :city
  %p
    = f.submit "Create", :class => 'button'

List of Form Builder Helpers

  • form_for(object, url, settings={}, &block)
    • Constructs a form using given or default form_builder
    • Supports form methods 'put' and 'delete' through hidden field
    • Defaults to StandardFormBuilder but you can easily create your own!
    • form_for(@user, '/register', :id => 'register') { |f| ...field-elements... }
    • form_for(:user, '/register', :id => 'register') { |f| ...field-elements... }
  • fields_for(object, settings={}, &block)
    • Constructs fields for a given object for use in an existing form
    • Defaults to StandardFormBuilder but you can easily create your own!
    • fields_for @user.assignment do |assignment| ... end
    • fields_for :assignment do |assigment| ... end

The following are fields provided by AbstractFormBuilder that can be used within a form_for or fields_for:

  • error_messages(options={})
    • Displays list html for the errors on form object
    • f.error_messages
  • label(field, options={})
    • f.label :name, :class => 'long'
  • text_field(field, options={})
    • f.text_field :username, :class => 'long'
  • check_box(field, options={})
    • Uses hidden field to provide a 'unchecked' value for field
    • f.check_box :remember_me, :uncheck_value => 'false'
  • radio_button(field, options={})
    • f.radio_button :gender, :value => 'male'
  • hidden_field(field, options={})
    • f.hidden_field :session_id, :class => 'hidden'
  • text_area(field, options={})
    • f.text_area :summary, :class => 'long'
  • password_field(field, options={})
    • f.password_field :secret, :class => 'long'
  • number_field(field, options={})
    • f.number_field :age, :class => 'long'
  • telephone_field(field, options={})
    • f.telephone_field :mobile, :class => 'long'
  • email_field(field, options={})
    • f.email_field :email, :class => 'long'
  • search_field(field, options={})
    • f.search_field :query, :class => 'long'
  • url_field(field, options={})
    • f.url_field :image_source, :class => 'long'
  • file_field(field, options={})
    • f.file_field :photo, :class => 'long'
  • select(field, options={})
    • f.select(:state, :options => ['California', 'Texas', 'Wyoming'])
    • f.select(:state, :collection => @states, :fields => [:name, :id])
    • f.select(:state, :options => [...], :include_blank => true)
  • submit(caption, options={})
    • f.submit "Update", :class => 'long'
  • image_submit(source, options={})
    • f.image_submit "submit.png", :class => 'long'

last updated: 2016-11-26

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