set default email domain in ENV

app/views/about/_registration.html.haml

@@ -6,9 +6,8 @@
       = f.simple_fields_for :account do |account_fields|
         = account_fields.input :username, wrapper: :with_label, label: false, required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off', placeholder: t('simple_form.labels.defaults.username') }, append: "(@#{site_hostname})", hint: false, disabled: closed_registrations?
 
-      /= f.input :email, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
-
-      = f.input :email, wrapper: :with_label, label: false, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off', :type => 'text' }, append: "@mails.tsinghua.edu.cn", hint: false, disabled: closed_registrations?
+      - email_domain = Rails.configuration.x.email_default_domain
+      = f.input :email, wrapper: :with_label, label: false, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off', :type => 'text' }, append: "@#{email_domain}", hint: false, disabled: closed_registrations?
       = f.input :password, placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
       = f.input :password_confirmation, placeholder: t('simple_form.labels.defaults.confirm_password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_password'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
 

app/views/auth/registrations/new.html.haml

@@ -17,7 +17,8 @@
       = ff.input :username, wrapper: :with_label, autofocus: true, label: t('simple_form.labels.defaults.username'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off' }, append: "(@#{site_hostname})", hint: t('simple_form.hints.defaults.username', domain: site_hostname)
 
   .fields-group
-    = f.input :email, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off', :type => 'text' }, append: "@mails.tsinghua.edu.cn"
+    - email_domain = Rails.configuration.x.email_default_domain
+    = f.input :email, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off', :type => 'text' }, append: "@#{email_domain}"
 
   .fields-group
     = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off' }

config/initializers/blacklists.rb

@@ -3,4 +3,5 @@
 Rails.application.configure do
   config.x.email_domains_blacklist = ENV.fetch('EMAIL_DOMAIN_BLACKLIST') { 'mvrht.com' }
   config.x.email_domains_whitelist = ENV.fetch('EMAIL_DOMAIN_WHITELIST') { '' }
+  config.x.email_default_domain = ENV.fetch('EMAIL_DEFAULT_DOMAIN') { '???.edu.cn' }
 end

public/auto_comp_email.js

@@ -1,4 +1,6 @@
-var em = document.getElementById("user_email");
+var em = document.getElementById("registration_user_email");
+if(!em)
+  em = document.getElementById("user_email");
 var ap = em.nextSibling;
 em.addEventListener("blur", function( event ) {
 	if(ap.style.display != 'none' && em.value) {