Errors do not receive focus on submit (Accessibility) (#8278)

src/Umbraco.Web.UI.Client/src/common/services/formhelper.service.js

@@ -33,6 +33,7 @@ function formHelper(angularHelper, serverValidationManager, notificationsService
             if (!args.scope) {
                 throw "args.scope cannot be null";
             }
+
             if (!args.formCtrl) {
                 //try to get the closest form controller
                 currentForm = angularHelper.getRequiredCurrentForm(args.scope);
@@ -44,9 +45,12 @@ function formHelper(angularHelper, serverValidationManager, notificationsService
             //the first thing any form must do is broadcast the formSubmitting event
             args.scope.$broadcast("formSubmitting", { scope: args.scope, action: args.action });
 
+            this.focusOnFirstError(currentForm);
+
             //then check if the form is valid
             if (!args.skipValidation) {
                 if (currentForm.$invalid) {
+
                     return false;
                 }
             }
@@ -57,6 +61,32 @@ function formHelper(angularHelper, serverValidationManager, notificationsService
             return true;
         },
 
+         /**
+         * @ngdoc function
+         * @name umbraco.services.formHelper#focusOnFirstError
+         * @methodOf umbraco.services.formHelper
+         * @function
+         *
+         * @description
+         * Called by submitForm when a form has been submitted, it will fire a focus on the first found invalid umb-property it finds in the form..
+         * 
+         * @param {object} form Pass in a form object.
+         */
+        focusOnFirstError: function(form) {
+            var invalidNgForms = form.$$element.find(`.umb-property ng-form.ng-invalid, .umb-property-editor ng-form.ng-invalid-required`);
+            var firstInvalidNgForm = invalidNgForms.first();
+
+            if(firstInvalidNgForm.length !== 0) {
+                var focusableFields = [...firstInvalidNgForm.find("umb-range-slider .noUi-handle,input,textarea,select,button")];
+                if(focusableFields.length !== 0) { 
+                    var firstErrorEl = focusableFields.find(el => el.type !== "hidden" && el.hasAttribute("readonly") === false);
+                    if(firstErrorEl.length !== 0) {
+                        firstErrorEl.focus();
+                    }
+                }
+            }
+        },
+
         /**
          * @ngdoc function
          * @name umbraco.services.formHelper#submitForm

src/Umbraco.Web.UI.Client/src/views/propertyeditors/dropdownFlexible/dropdownFlexible.controller.js

@@ -18,7 +18,7 @@ angular.module("umbraco").controller("Umbraco.PropertyEditors.DropdownFlexibleCo
         
         //ensure when form is saved that we don't store [] or [null] as string values in the database when no items are selected
         $scope.$on("formSubmitting", function () {
-            if ($scope.model.value.length === 0 || $scope.model.value[0] === null) {
+            if ($scope.model.value !== null && ($scope.model.value.length === 0 || $scope.model.value[0] === null)) {
                 $scope.model.value = null;
             }
         });