feat: added progress bar and disable buttons when async validation is running

Signed-off-by: blam <ben@blam.sh>

plugins/scaffolder-react/src/next/components/Stepper/Stepper.test.tsx

@@ -22,6 +22,7 @@ import type { RJSFValidationError } from '@rjsf/utils';
 import { JsonValue } from '@backstage/types';
 import { NextFieldExtensionComponentProps } from '../../extensions';
 import { LayoutTemplate } from '../../../layouts';
+import { AsyncDependenciesBlock } from 'webpack';
 
 describe('Stepper', () => {
   it('should render the step titles for each step of the manifest', async () => {
@@ -237,6 +238,50 @@ describe('Stepper', () => {
     expect(getByText('im a custom field extension')).toBeInTheDocument();
   });
 
+  it('should disable the form with progress when async validators are running', async () => {
+    const MockComponent = () => {
+      return <h1>im a custom field extension</h1>;
+    };
+
+    const manifest: TemplateParameterSchema = {
+      title: 'Custom Fields',
+      steps: [
+        {
+          title: 'Test',
+          schema: {
+            properties: {
+              name: {
+                type: 'string',
+                'ui:field': 'Mock',
+              },
+            },
+          },
+        },
+      ],
+    };
+
+    const { getByRole } = await renderInTestApp(
+      <Stepper
+        manifest={manifest}
+        extensions={[
+          {
+            name: 'Mock',
+            component: MockComponent,
+            validation: async () => new Promise(r => setTimeout(r, 1000)),
+          },
+        ]}
+        onCreate={jest.fn()}
+      />,
+    );
+
+    await act(async () => {
+      await fireEvent.click(getByRole('button', { name: 'Review' }));
+
+      expect(getByRole('progressbar')).toBeInTheDocument();
+      expect(getByRole('button', { name: 'Review' })).toBeDisabled();
+    });
+  });
+
   it('should transform default error message', async () => {
     const manifest: TemplateParameterSchema = {
       steps: [

plugins/scaffolder-react/src/next/components/Stepper/Stepper.tsx

@@ -21,6 +21,7 @@ import {
   StepLabel as MuiStepLabel,
   Button,
   makeStyles,
+  LinearProgress,
 } from '@material-ui/core';
 import { type IChangeEvent } from '@rjsf/core-v5';
 import { ErrorSchema } from '@rjsf/utils';
@@ -93,6 +94,7 @@ export const Stepper = (stepperProps: StepperProps) => {
   const { steps } = useTemplateSchema(props.manifest);
   const apiHolder = useApiHolder();
   const [activeStep, setActiveStep] = useState(0);
+  const [isValidating, setIsValidating] = useState(false);
   const [formState, setFormState] = useFormDataFromQuery(props.initialState);
 
   const [errors, setErrors] = useState<undefined | FormValidation>();
@@ -133,12 +135,13 @@ export const Stepper = (stepperProps: StepperProps) => {
   }: {
     formData?: Record<string, JsonValue>;
   }) => {
-    // TODO(blam): What do we do about loading states, does each field extension get a chance
-    // to display it's own loading? Or should we grey out the entire form.
     setErrors(undefined);
+    setIsValidating(true);
 
     const returnedValidation = await validation(formData);
 
+    setIsValidating(false);
+
     if (hasErrors(returnedValidation)) {
       setErrors(returnedValidation);
     } else {
@@ -154,6 +157,7 @@ export const Stepper = (stepperProps: StepperProps) => {
 
   return (
     <>
+      {isValidating && <LinearProgress variant="indeterminate" />}
       <MuiStepper activeStep={activeStep} alternativeLabel variant="elevation">
         {steps.map((step, index) => (
           <MuiStep key={index}>
@@ -183,11 +187,16 @@ export const Stepper = (stepperProps: StepperProps) => {
               <Button
                 onClick={handleBack}
                 className={styles.backButton}
-                disabled={activeStep < 1}
+                disabled={activeStep < 1 || isValidating}
               >
                 Back
               </Button>
-              <Button variant="contained" color="primary" type="submit">
+              <Button
+                variant="contained"
+                color="primary"
+                type="submit"
+                disabled={isValidating}
+              >
                 {activeStep === steps.length - 1 ? reviewButtonText : 'Next'}
               </Button>
             </div>