handle focus during and after upload

app/helpers/application_helper.rb

@@ -79,6 +79,12 @@ module ApplicationHelper
     # rubocop:enable Rails/OutputSafety
   end
 
+  def focus_element(selector)
+    # rubocop:disable Rails/OutputSafety
+    raw("document.querySelector('#{selector}').focus();")
+    # rubocop:enable Rails/OutputSafety
+  end
+
   def disable_element(selector)
     # rubocop:disable Rails/OutputSafety
     raw("document.querySelector('#{selector}').disabled = true;")

app/javascript/shared/activestorage/progress-bar.js

@@ -25,6 +25,7 @@ export default class ProgressBar {
     const element = getDirectUploadElement(id);
     if (element) {
       element.classList.remove(PENDING_CLASS);
+      element.focus();
     }
   }
 

app/views/champs/piece_justificative/show.js.erb

@@ -4,3 +4,5 @@
 <% if attachment.virus_scanner.pending? %>
   <%= fire_event('attachment:update', { url: attachment_url(attachment.id, { signed_id: attachment.blob.signed_id, user_can_upload: true }) }.to_json ) %>
 <% end %>
+
+<%= focus_element("button[data-toggle-target=\".attachment-input-#{attachment.id}\"]") %>