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ActiveAdmin plugin to add dynamic behaviors to fields
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.rubocop.yml 🎉 Support ActiveAdmin 2.x and code style improvements Jun 15, 2019

ActiveAdmin Dynamic Fields Gem Version

An Active Admin plugin to add dynamic behaviors to fields.


  • set conditional checks on fields
  • trigger some actions on other fields
  • inline field editing
  • create links to load some content in a dialog

The easiest way to show how this plugin works is looking the examples below.


  • Add to your Gemfile: gem 'activeadmin_dynamic_fields'
  • Execute bundle
  • Add at the end of your ActiveAdmin javascripts (app/assets/javascripts/active_admin.js): //= require activeadmin/dynamic_fields


Options are passed to fields using input_html parameter as data attributes:

  • data-if: check a condition, values:
    • checked: check if a checkbox is checked
    • not_checked: check if a checkbox is not checked
    • blank: check if a field is blank
    • not_blank: check if a field is not blank
    • changed: check if the value of an input is changed (dirty)
  • data-eq: check if a field has a specific value
  • data-not: check if a field hasn't a specific value
  • data-target: target css selector (from parent fieldset, look for the closest match)
  • data-gtarget: target css selector globally
  • data-action: the action to trigger, values:
    • hide: hides elements
    • slide: hides elements (using sliding)
    • fade: hides elements (using fading)
    • addClass: adds classes
    • setValue: set a value
    • callback: call a function
  • data-function: check the return value of a custom function
  • data-arg: argument passed to the custom set function (as array of strings)


Dynamic fields examples

  • A checkbox that hides other fields if is checked (ex. model Article):
form do |f|
  f.inputs 'Article' do
    f.input :published, input_html: { data: { if: 'checked', action: 'hide', target: '.grp1' } }
    f.input :online_date, wrapper_html: { class: 'grp1' }
    f.input :draft_notes, wrapper_html: { class: 'grp1' }
  • Add 3 classes (first, second, third) if a checkbox is not checked:

f.input :published, input_html: { data: { if: 'not_checked', action: 'addClass first second third', target: '.grp1' } }

  • Set another field value if a string field is blank:

f.input :title, input_html: { data: { if: 'blank', action: 'setValue 10', target: '#article_position' } }

  • Use a custom function for conditional check (title_not_empty() must be available on global scope) (with alternative syntax for data attributes):

f.input :title, input_html: { 'data-function': 'title_empty', 'data-action': 'slide', 'data-target': '#article_description_input' }

function title_empty( el ) {
  return ( $('#article_title').val().trim() === '' );
  • Call a callback function as action:

f.input :published, input_html: { data: { if: 'checked', action: 'callback set_title', args: '["Unpublished !"]' } }

function set_title( args ) {
  if( $('#article_title').val().trim() === '' ) {
    $('#article_title').val( args[0] );
    $('#article_title').trigger( 'change' );
  • Custom function without action:

f2.input :category, as: :select, collection: [ [ 'Cat 1', 'cat1' ], [ 'Cat 2', 'cat2' ], [ 'Cat 3', 'cat3' ] ], input_html: { 'data-function': 'on_change_category' }

function on_change_category( el ) {
  var target = el.closest( 'fieldset' ).find( '.pub' );
  target.prop( 'checked', ( el.val() == 'cat2' ) );
  target.trigger( 'change' );

Inline editing examples

  • Prepare a custom member action to save data, an update helper function is available (third parameter is optional, allow to filter using strong parameters):
member_action :save, method: [:post] do
  render ActiveAdmin::DynamicFields::update( resource, params )
  # render ActiveAdmin::DynamicFields::update( resource, params, [:published] )
  # render ActiveAdmin::DynamicFields::update( resource, params, Article::permit_params )
  • In index config:
# Edit a string:
column :title do |row|
  div row.title, ActiveAdmin::DynamicFields::edit_string( :title, save_admin_article_path( ) )
# Edit a boolean:
column :published do |row|
  status_tag row.published, ActiveAdmin::DynamicFields::edit_boolean( :published, save_admin_article_path( ), row.published )
# Edit a select ([''] allow to have a blank value):
column :author do |row|
  select ActiveAdmin::DynamicFields::edit_select( :author_id, save_admin_article_path( ) ) do
    options_for_select( [''] + Author.pluck( :name, :id ), row.author_id )
  • In show config (less useful):
row :title do |row|
  div row.title, ActiveAdmin::DynamicFields::edit_string( :title, save_admin_article_path( ) )

Dialog example

Example with 2 models: Author and Article

Prepare the content dialog - in Active Admin Author config:

ActiveAdmin.register Author do
  # ...
  member_action :dialog do
    content  = '<dl style="margin: 12px">'
    [:name, :age, :created_at].each do |field|
      content += "<dt>#{Author.human_attribute_name(field)}:</dt><dd>#{resource[field]}</dd>"
    content += '</dl>'
    render plain: content
  # ...

Add a link to show the dialog - in Active Admin Article config:

ActiveAdmin.register Article do
  # ...
  show do |object|
    attributes_table do
      # ...
      row :author do
        link_to, dialog_admin_author_path( ), title:, 'data-df-dialog': true, 'data-df-icon': true
  # ...

The link url is loaded via AJAX before opening the dialog.

Do you like it? Star it!

If you use this component just star it. A developer is more motivated to improve a project when there is some interest.

Take a look at other ActiveAdmin components that I made if you are curious.




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