misc: do not call autosave on preview pages (#28309)

tests/form_pages/test_all.py

@@ -2707,6 +2707,9 @@ def test_preview_form(pub):
     user.store()
     page = login(get_app(pub), username='foo', password='foo').get('/preview/test/')
 
+    # check the form is marked as a preview (this disables autosave calls)
+    assert page.pyquery('form[data-autosave=false]').length
+
     # check no formdata gets stored
     next_page = page.forms[0].submit('submit')
     assert 'Check values then click submit.' in next_page.text

wcs/forms/preview.py

@@ -31,6 +31,11 @@ class PreviewFormPage(FormPage):
     def check_disabled(self):
         return False
 
+    def create_form(self, *args, **kwargs):
+        form = super().create_form(*args, **kwargs)
+        form.attrs['data-autosave'] = 'false'
+        return form
+
     def submitted(self, *args, **kwargs):
         self.html_top(self.formdef.name)
         r = TemplateIO(html=True)

wcs/qommon/static/js/qommon.forms.js

@@ -123,7 +123,7 @@ Responsive_table_widget.prototype.init = function () {
 
 $(function() {
   var autosave_timeout_id = null;
-  if ($('form[data-has-draft]').length == 1) {
+  if ($('form[data-has-draft]:not([data-autosave=false])').length == 1) {
     var last_auto_save = $('form[data-has-draft]').serialize();
     function autosave() {
       var $form = $('form[data-has-draft]');