= semantic_form_for [:admin, @user] do |f|
  = f.inputs 'Basic Information' do
    = f.input :is_admin, hint: 'An admin can create a new conference, manage users and make other users admins.'
    = f.input :name, :as => :string
    = f.input :email
    = f.input :affiliation, as: :string
    = f.input :biography, input_html: { rows: 5, "onkeyup" => "word_count(this, 'biography-count', 150)" }
    You have used
    %span#biography-count #{@user.biography_word_count}
    words.  Biographies are limited to 150 words.
    %br
    %br
    = f.actions do
      = f.action :submit, button_html: { class: 'btn btn-primary' }