preserve the form data so when we update the additionalErrors the dat…

packages/core/src/generators/schema.ts

@@ -177,5 +177,5 @@ export const generateJsonSchema = (
 
   const gen = new Gen(findOption);
 
-  return gen.schemaObject(instance);
+  return gen.property(instance);
 };

packages/vue-vuetify/dev/views/ExampleView.vue

@@ -91,7 +91,6 @@ const onChange = (event: JsonFormsChangeEvent): void => {
       monaco.Uri.parse(toDataUri(props.example.name)),
       event.data !== undefined ? JSON.stringify(event.data, null, 2) : '',
     );
-    state.data = event.data;
   }
   errors.value = event.errors;
 };

packages/vue/src/components/JsonForms.vue

@@ -26,21 +26,24 @@ import {
   defaultMiddleware,
   Middleware,
   JsonFormsSubStates,
+  Layout,
 } from '@jsonforms/core';
 import { JsonFormsChangeEvent, MaybeReadonly } from '../types';
 import DispatchRenderer from './DispatchRenderer.vue';
 
 import type Ajv from 'ajv';
 import type { ErrorObject } from 'ajv';
 
-// TODO fix @typescript-eslint/ban-types
-// eslint-disable-next-line @typescript-eslint/ban-types
-const isObject = (elem: any): elem is Object => {
-  return elem && typeof elem === 'object';
-};
-
 const EMPTY: ErrorObject[] = reactive([]);
 
+const createDefaultLayout = (): Layout => ({
+  type: 'VerticalLayout',
+  elements: [],
+});
+const generateUISchema = (schema: JsonSchema) =>
+  Generate.uiSchema(schema, undefined, undefined, schema) ??
+  createDefaultLayout();
+
 export default defineComponent({
   name: 'JsonForms',
   components: {
@@ -123,13 +126,10 @@ export default defineComponent({
   },
   emits: ['change'],
   data() {
-    const dataToUse = this.data;
-    const generatorData = isObject(dataToUse) ? dataToUse : {};
+    const dataToUse = this.data === undefined ? {} : this.data;
     const schemaToUse: JsonSchema =
-      this.schema ?? Generate.jsonSchema(generatorData);
-    const uischemaToUse =
-      this.uischema ??
-      Generate.uiSchema(schemaToUse, undefined, undefined, schemaToUse);
+      this.schema ?? Generate.jsonSchema(dataToUse);
+    const uischemaToUse = this.uischema ?? generateUISchema(schemaToUse);
     const initCore = (): JsonFormsCore => {
       const initialCore = {
         data: dataToUse,
@@ -189,29 +189,23 @@ export default defineComponent({
   },
   watch: {
     schema(newSchema) {
-      const generatorData = isObject(this.data) ? this.data : {};
-      this.schemaToUse = newSchema ?? Generate.jsonSchema(generatorData);
+      this.schemaToUse = newSchema ?? Generate.jsonSchema(this.dataToUse);
       if (!this.uischema) {
-        this.uischemaToUse = Generate.uiSchema(
-          this.schemaToUse,
-          undefined,
-          undefined,
-          this.schemaToUse
-        );
+        this.uischemaToUse = generateUISchema(this.schemaToUse);
       }
     },
     uischema(newUischema) {
-      this.uischemaToUse =
-        newUischema ??
-        Generate.uiSchema(
-          this.schemaToUse,
-          undefined,
-          undefined,
-          this.schemaToUse
-        );
+      this.uischemaToUse = newUischema ?? generateUISchema(this.schemaToUse);
     },
     data(newData) {
-      this.dataToUse = newData;
+      this.dataToUse = newData === undefined ? {} : newData;
+
+      if (!this.schema) {
+        this.schemaToUse = Generate.jsonSchema(this.dataToUse);
+        if (!this.uischema) {
+          this.uischemaToUse = generateUISchema(this.schemaToUse);
+        }
+      }
     },
     renderers(newRenderers) {
       this.jsonforms.renderers = newRenderers;
@@ -251,6 +245,9 @@ export default defineComponent({
       );
     },
     eventToEmit(newEvent) {
+      // update the data so if we change the additionalErrors this won't reset the form data
+      this.dataToUse = newEvent.data;
+
       this.$emit('change', newEvent);
     },
     i18n: {