Show password checkbox

new.html.erb

<%= form_for @user, url: :signup do |f| %>
  <%= f.label :email %>
  <%= f.email_field :email %>
  
  <%= f.label :password %>
  <%= f.password_field :password, autocomplete: 'off' %>
  
  <input type="checkbox" id="show_password" />
  <label for="show_password">Show Password</label>

  <%= f.submit "Sign Up" %>
<% end %>

signup.js.coffee

show_password.addEventListener 'change', ->
  user_password.type = if @checked then 'text' else 'password'

# Notes:
# - Rails filters password parameter (Rails.application.config.filter_parameters)
# - Disable the password field autocompletion!