form: validate forms only when submitting dossier, not on draft saves

app/assets/javascripts/new_design/direct_uploads.js

@@ -55,7 +55,15 @@ addEventListener('turbolinks:load', function() {
         // the attached files, and then fire the submit action again – but forgetting
         // which button was clicked. So we manually set the type of action that trigerred
         // the form submission.
-        hiddenInput.value = button.getAttribute('data-action');
+        var action = button.getAttribute('data-action');
+        hiddenInput.value = action;
+        // Some form fields are marked as mandatory, but when saving a draft we don't want them
+        // to be enforced by the browser.
+        if (action === 'submit') {
+          button.form.removeAttribute('novalidate');
+        } else {
+          button.form.setAttribute('novalidate', 'novalidate');
+        }
       });
     });
 });

app/views/shared/dossiers/_edit.html.haml

@@ -11,7 +11,7 @@
   - if apercu
     - form_options = { url: '', method: :get, html: { class: 'form', multipart: true } }
   - else
-    - form_options = { html: { class: 'form', multipart: true } }
+    - form_options = { html: { class: 'form', multipart: true, novalidate: dossier.brouillon? } }
 
   = form_for dossier, form_options do |f|
     = f.fields_for :champs, dossier.champs do |champ_form|