Feat: Allow raising errors from within a custom whatever(#2718)

CHANGELOG.md

@@ -16,6 +16,19 @@ should change the heading of the (upcoming) version to include a major version b
 
 -->
 
+# 5.20.0
+
+## @rjsf/core 
+
+- Support allowing raising errors from within a custom Widget [#2718](https://github.com/rjsf-team/react-jsonschema-form/issues/2718)
+
+## @rjsf/utils
+
+- Updated the `WidgetProps` type to add `es?: ErrorSchema<T>, id?: string` to the params of the `onChange` handler function
+
+## Dev / docs / playground
+
+-  Update the `custom-widget-fields.md` to add documentation for how to raise errors from a custom widget or field
 # 5.19.4
 
 ## @rjsf/core 

packages/core/src/components/Form.tsx

@@ -34,6 +34,7 @@ import {
   ValidatorType,
   Experimental_DefaultFormStateBehavior,
 } from '@rjsf/utils';
+import _forEach from 'lodash/forEach';
 import _get from 'lodash/get';
 import _isEmpty from 'lodash/isEmpty';
 import _pick from 'lodash/pick';
@@ -421,7 +422,17 @@ export default class Form<
     if (mustValidate) {
       const schemaValidation = this.validate(formData, schema, schemaUtils, _retrievedSchema);
       errors = schemaValidation.errors;
-      errorSchema = schemaValidation.errorSchema;
+      // If the schema has changed, we do not merge state.errorSchema.
+      // Else in the case where it hasn't changed, we merge 'state.errorSchema' with 'schemaValidation.errorSchema.' This done to display the raised field error.
+      if (isSchemaChanged) {
+        errorSchema = schemaValidation.errorSchema;
+      } else {
+        errorSchema = mergeObjects(
+          this.state?.errorSchema,
+          schemaValidation.errorSchema,
+          'preventDuplicates'
+        ) as ErrorSchema<T>;
+      }
       schemaValidationErrors = errors;
       schemaValidationErrorSchema = errorSchema;
     } else {
@@ -581,6 +592,31 @@ export default class Form<
     return newFormData;
   };
 
+  // Filtering errors based on your retrieved schema to only show errors for properties in the selected branch.
+  private filterErrorsBasedOnSchema(schemaErrors: ErrorSchema<T>, resolvedSchema?: S, formData?: any): ErrorSchema<T> {
+    const { retrievedSchema, schemaUtils } = this.state;
+    const _retrievedSchema = resolvedSchema ?? retrievedSchema;
+    const pathSchema = schemaUtils.toPathSchema(_retrievedSchema, '', formData);
+    const fieldNames = this.getFieldNames(pathSchema, formData);
+    const filteredErrors: ErrorSchema<T> = _pick(schemaErrors, fieldNames as unknown as string[]);
+    // If the root schema is of a primitive type, do not filter out the __errors
+    if (resolvedSchema?.type !== 'object' && resolvedSchema?.type !== 'array') {
+      filteredErrors.__errors = schemaErrors.__errors;
+    }
+    // Removing undefined and empty errors.
+    const filterUndefinedErrors = (errors: any): ErrorSchema<T> => {
+      _forEach(errors, (errorAtKey, errorKey: keyof typeof errors) => {
+        if (errorAtKey === undefined) {
+          delete errors[errorKey];
+        } else if (typeof errorAtKey === 'object' && !Array.isArray(errorAtKey.__errors)) {
+          filterUndefinedErrors(errorAtKey);
+        }
+      });
+      return errors;
+    };
+    return filterUndefinedErrors(filteredErrors);
+  }
+
   /** Function to handle changes made to a field in the `Form`. This handler receives an entirely new copy of the
    * `formData` along with a new `ErrorSchema`. It will first update the `formData` with any missing default fields and
    * then, if `omitExtraData` and `liveOmit` are turned on, the `formData` will be filtered to remove any extra data not
@@ -624,6 +660,11 @@ export default class Form<
         errorSchema = merged.errorSchema;
         errors = merged.errors;
       }
+      // Merging 'newErrorSchema' into 'errorSchema' to display the custom raised errors.
+      if (newErrorSchema) {
+        const filteredErrors = this.filterErrorsBasedOnSchema(newErrorSchema, retrievedSchema, newFormData);
+        errorSchema = mergeObjects(errorSchema, filteredErrors, 'preventDuplicates') as ErrorSchema<T>;
+      }
       state = {
         formData: newFormData,
         errors,

packages/core/test/ArrayField.test.jsx

@@ -5,6 +5,8 @@ import sinon from 'sinon';
 
 import { createFormComponent, createSandbox, submitForm } from './test_utils';
 import SchemaField from '../src/components/fields/SchemaField';
+import ArrayField from '../src/components/fields/ArrayField';
+import { TextWidgetTest } from './StringField.test';
 
 const ArrayKeyDataAttr = 'data-rjsf-itemkey';
 const ExposedArrayKeyTemplate = function (props) {
@@ -157,6 +159,26 @@ const ArrayFieldTestItemTemplate = (props) => {
   );
 };
 
+const ArrayFieldTest = (props) => {
+  const onChangeTest = (newFormData, errorSchema, id) => {
+    if (Array.isArray(newFormData) && newFormData.length === 1) {
+      const itemValue = newFormData[0]?.text;
+      if (itemValue !== 'Appie') {
+        const raiseError = {
+          ...errorSchema,
+          0: {
+            text: {
+              __errors: ['Value must be "Appie"'],
+            },
+          },
+        };
+        props.onChange(newFormData, raiseError, id);
+      }
+    }
+  };
+  return <ArrayField {...props} onChange={onChangeTest} />;
+};
+
 describe('ArrayField', () => {
   let sandbox;
   const CustomComponent = (props) => {
@@ -3196,5 +3218,101 @@ describe('ArrayField', () => {
         },
       });
     });
+
+    it('raise an error and check if the error is displayed', () => {
+      const { node } = createFormComponent({
+        schema,
+        formData: [
+          {
+            text: 'y',
+          },
+        ],
+        templates,
+        fields: {
+          ArrayField: ArrayFieldTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'test' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_0_text__error');
+      expect(errorMessages).to.have.length(1);
+      const errorMessageContent = node.querySelector('#root_0_text__error .text-danger').textContent;
+      expect(errorMessageContent).to.contain('Value must be "Appie"');
+    });
+
+    it('should not raise an error if value is correct', () => {
+      const { node } = createFormComponent({
+        schema,
+        formData: [
+          {
+            text: 'y',
+          },
+        ],
+        templates,
+        fields: {
+          ArrayField: ArrayFieldTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'Appie' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_0_text__error');
+      expect(errorMessages).to.have.length(0);
+    });
+
+    it('raise an error and check if the error is displayed using custom text widget', () => {
+      const { node } = createFormComponent({
+        schema,
+        formData: [
+          {
+            text: 'y',
+          },
+        ],
+        templates,
+        widgets: {
+          TextWidget: TextWidgetTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'hello' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_0_text__error');
+      expect(errorMessages).to.have.length(1);
+      const errorMessageContent = node.querySelector('#root_0_text__error .text-danger').textContent;
+      expect(errorMessageContent).to.contain('Value must be "test"');
+    });
+
+    it('should not raise an error if value is correct using custom text widget', () => {
+      const { node } = createFormComponent({
+        schema,
+        formData: [
+          {
+            text: 'y',
+          },
+        ],
+        templates,
+        widgets: {
+          TextWidget: TextWidgetTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'test' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_0_text__error');
+      expect(errorMessages).to.have.length(0);
+    });
   });
 });

packages/core/test/ObjectField.test.jsx

@@ -5,8 +5,26 @@ import sinon from 'sinon';
 import { UI_GLOBAL_OPTIONS_KEY } from '@rjsf/utils';
 
 import SchemaField from '../src/components/fields/SchemaField';
+import ObjectField from '../src/components/fields/ObjectField';
+import { TextWidgetTest } from './StringField.test';
 import { createFormComponent, createSandbox, submitForm } from './test_utils';
 
+const ObjectFieldTest = (props) => {
+  const onChangeTest = (newFormData, errorSchema, id) => {
+    const propertyValue = newFormData?.foo;
+    if (propertyValue !== 'test') {
+      const raiseError = {
+        ...errorSchema,
+        foo: {
+          __errors: ['Value must be "test"'],
+        },
+      };
+      props.onChange(newFormData, raiseError, id);
+    }
+  };
+  return <ObjectField {...props} onChange={onChangeTest} />;
+};
+
 describe('ObjectField', () => {
   let sandbox;
 
@@ -208,6 +226,78 @@ describe('ObjectField', () => {
         expect(node.querySelector(`code#${formContext[key]}`)).to.exist;
       });
     });
+
+    it('raise an error and check if the error is displayed', () => {
+      const { node } = createFormComponent({
+        schema,
+        fields: {
+          ObjectField: ObjectFieldTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'hello' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_foo__error');
+      expect(errorMessages).to.have.length(1);
+      const errorMessageContent = node.querySelector('#root_foo__error .text-danger').textContent;
+      expect(errorMessageContent).to.contain('Value must be "test"');
+    });
+
+    it('should not raise an error if value is correct', () => {
+      const { node } = createFormComponent({
+        schema,
+        fields: {
+          ObjectField: ObjectFieldTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'test' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_foo__error');
+      expect(errorMessages).to.have.length(0);
+    });
+
+    it('raise an error and check if the error is displayed using custom text widget', () => {
+      const { node } = createFormComponent({
+        schema,
+        widgets: {
+          TextWidget: TextWidgetTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'hello' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_foo__error');
+      expect(errorMessages).to.have.length(1);
+      const errorMessageContent = node.querySelector('#root_foo__error .text-danger').textContent;
+      expect(errorMessageContent).to.contain('Value must be "test"');
+    });
+
+    it('should not raise an error if value is correct using custom text widget', () => {
+      const { node } = createFormComponent({
+        schema,
+        widgets: {
+          TextWidget: TextWidgetTest,
+        },
+      });
+
+      const inputs = node.querySelectorAll('.field-string input[type=text]');
+      act(() => {
+        fireEvent.change(inputs[0], { target: { value: 'test' } });
+      });
+
+      const errorMessages = node.querySelectorAll('#root_foo__error');
+      expect(errorMessages).to.have.length(0);
+    });
   });
 
   describe('fields ordering', () => {