fix(Forms): add support for sessionStorageId in Field.Upload

packages/dnb-design-system-portal/src/docs/uilib/extensions/forms/feature-fields/more-fields/Upload/Examples.tsx

@@ -1,6 +1,11 @@
 import { Flex } from '@dnb/eufemia/src'
 import ComponentBox from '../../../../../../../shared/tags/ComponentBox'
-import { Field, Form, Tools } from '@dnb/eufemia/src/extensions/forms'
+import {
+  Field,
+  Form,
+  Tools,
+  Value,
+} from '@dnb/eufemia/src/extensions/forms'
 import { createMockFile } from '../../../../../../../docs/uilib/components/upload/Examples'
 import useUpload from '@dnb/eufemia/src/components/upload/useUpload'
 import { UploadValue } from '@dnb/eufemia/src/extensions/forms/Field/Upload'
@@ -252,3 +257,27 @@ export const WithAsyncOnFileClick = () => {
     </ComponentBox>
   )
 }
+
+export function SessionStorage() {
+  return (
+    <ComponentBox>
+      <Form.Handler sessionStorageId="documents">
+        <Flex.Stack>
+          <Form.Card>
+            <Field.Upload path="/documents" />
+            <Value.Upload
+              path="/documents"
+              label="Uploaded files"
+              placeholder="No files uploaded."
+              variant="ol"
+              showEmpty
+            />
+          </Form.Card>
+
+          <Form.SubmitButton />
+          <Tools.Log />
+        </Flex.Stack>
+      </Form.Handler>
+    </ComponentBox>
+  )
+}

packages/dnb-design-system-portal/src/docs/uilib/extensions/forms/feature-fields/more-fields/Upload/demos.mdx

@@ -26,6 +26,12 @@ import * as Examples from './Examples'
 
 <Examples.Customized />
 
+### Session storage support
+
+The `sessionStorageId` property can be used to store the files in the session storage so they persist between page reloads.
+
+<Examples.SessionStorage />
+
 ### With asynchronous file handler
 
 The `fileHandler` property supports an asynchronous function, and can be used for handling/validating files asynchronously, like to upload files to a virus checker and display errors based on the outcome:

packages/dnb-design-system-portal/src/docs/uilib/extensions/forms/feature-fields/more-fields/Upload/info.mdx

@@ -160,3 +160,9 @@ function MyForm() {
   )
 }
 ```
+
+### Persist files in session storage
+
+The `sessionStorageId` property can be used to store the files in the session storage so they persist between page reloads.
+
+But the persisted files only render the file name, and not the file itself. The file blob will be lost during the serialization process.

packages/dnb-eufemia/src/extensions/forms/Field/Upload/Upload.tsx

@@ -83,9 +83,22 @@ function UploadComponent(props: Props) {
     [formsTr.errorRequired]
   )
 
+  const fromInput = useCallback((value: UploadValue) => {
+    value.forEach((item, index) => {
+      value[index] = item
+
+      // Store the name in the value, to support session storage (serialization)
+      value[index]['name'] = item['name'] || item.file?.name
+    })
+
+    return value
+  }, [])
+
   const preparedProps = {
     errorMessages,
     validateRequired,
+    fromInput,
+    toInput: transformFiles,
     ...props,
   }
 
@@ -128,11 +141,7 @@ function UploadComponent(props: Props) {
   }, [files])
 
   useEffect(() => {
-    // Files stored in session storage will not have a property (due to serialization).
-    const hasInvalidFiles = value?.some(({ file }) => !file?.name)
-    if (!hasInvalidFiles) {
-      setFiles(value)
-    }
+    setFiles(value)
   }, [setFiles, value])
 
   const handleChangeAsync = useCallback(
@@ -173,7 +182,7 @@ function UploadComponent(props: Props) {
         handleChange(existingFiles)
       }
     },
-    [files, setFiles, fileHandler, handleChange]
+    [setFiles, fileHandler, handleChange]
   )
 
   const changeHandler = useCallback(
@@ -241,3 +250,21 @@ function UploadComponent(props: Props) {
 export default UploadComponent
 
 UploadComponent._supportsSpacingProps = true
+
+export function transformFiles(value: UploadValue) {
+  if (Array.isArray(value)) {
+    if (value.length === 0) {
+      return undefined
+    }
+
+    value.map((item) => {
+      if (item?.file && !(item.file instanceof File)) {
+        // To support session storage, we recreated the file blob.
+        item['file'] = new File([], item['name'])
+      }
+      return item
+    })
+  }
+
+  return value
+}

packages/dnb-eufemia/src/extensions/forms/Field/Upload/__tests__/Upload.test.tsx

@@ -207,11 +207,13 @@ describe('Field.Upload', () => {
               file: file1,
               id: expect.any(String),
               exists: expect.any(Boolean),
+              name: 'fileName-1.png',
             },
             {
               file: file2,
               id: expect.any(String),
               exists: expect.any(Boolean),
+              name: 'fileName-2.png',
             },
           ],
         },
@@ -256,6 +258,7 @@ describe('Field.Upload', () => {
               file: file1,
               exists: false,
               id: expect.anything(),
+              name: 'fileName-1.png',
             },
             {
               errorMessage: nbShared.Upload.errorLargeFile.replace(
@@ -265,6 +268,7 @@ describe('Field.Upload', () => {
               file: file2,
               exists: false,
               id: expect.anything(),
+              name: 'fileName-2.png',
             },
           ],
         },
@@ -276,6 +280,7 @@ describe('Field.Upload', () => {
           file: file1,
           exists: false,
           id: expect.anything(),
+          name: 'fileName-1.png',
         },
         {
           errorMessage: nbShared.Upload.errorLargeFile.replace(
@@ -285,6 +290,7 @@ describe('Field.Upload', () => {
           file: file2,
           exists: false,
           id: expect.anything(),
+          name: 'fileName-2.png',
         },
       ])
 
@@ -310,6 +316,7 @@ describe('Field.Upload', () => {
               file: file1,
               exists: false,
               id: expect.anything(),
+              name: 'fileName-1.png',
             },
           ],
         },
@@ -353,6 +360,7 @@ describe('Field.Upload', () => {
               exists: false,
               file: file1,
               id: expect.any(String),
+              name: 'fileName-1.png',
             }),
           ],
         },
@@ -399,6 +407,7 @@ describe('Field.Upload', () => {
               exists: false,
               file: file1,
               id: expect.any(String),
+              name: 'fileName-1.png',
             }),
           ],
         },
@@ -468,6 +477,7 @@ describe('Field.Upload', () => {
               file: file1,
               exists: false,
               id: expect.anything(),
+              name: 'fileName-1.png',
             },
           ],
         },
@@ -734,6 +744,7 @@ describe('Field.Upload', () => {
               file: file1,
               exists: false,
               id: expect.anything(),
+              name: 'fileName-1.png',
             },
           ],
         },
@@ -1475,7 +1486,7 @@ describe('Field.Upload', () => {
     })
   })
 
-  it('should not set files from session storage if they are invalid', async () => {
+  it('should recreate files from session storage', async () => {
     const file = createMockFile('fileName.png', 100, 'image/png')
 
     const { unmount } = render(
@@ -1517,15 +1528,16 @@ describe('Field.Upload', () => {
     expect(dataContext.internalDataRef.current.myFiles).toEqual([
       {
         exists: false,
-        file: {},
+        file: new File([], 'fileName.png'),
         id: expect.any(String),
+        name: 'fileName.png',
       },
     ])
     const [title] = Array.from(document.querySelectorAll('p'))
     expect(title).toHaveTextContent(nbShared.Upload.title)
     expect(
       document.querySelectorAll('.dnb-upload__file-cell').length
-    ).toBe(0)
+    ).toBe(1)
   })
 
   describe('transformIn and transformOut', () => {

packages/dnb-eufemia/src/extensions/forms/Field/Upload/stories/Upload.stories.tsx

@@ -1,4 +1,4 @@
-import { Field, Form, Tools } from '../../..'
+import { Field, Form, Tools, Value } from '../../..'
 import { Flex } from '../../../../../components'
 import { UploadFileNative } from '../../../../../components/Upload'
 import { createRequest } from '../../../Form/Handler/stories/FormHandler.stories'
@@ -216,8 +216,6 @@ export function TransformInAndOut() {
     >
       <Flex.Stack>
         <Field.Upload
-          label="Label"
-          placeholder="This is a Field"
           path="/documents"
           transformIn={transformIn}
           transformOut={transformOut}
@@ -233,3 +231,25 @@ export function TransformInAndOut() {
     </Form.Handler>
   )
 }
+
+export function SessionStorage() {
+  return (
+    <Form.Handler sessionStorageId="documents">
+      <Flex.Stack>
+        <Form.Card>
+          <Field.Upload path="/documents" />
+          <Value.Upload
+            path="/documents"
+            label="Uploaded files"
+            placeholder="No files uploaded."
+            variant="ol"
+            showEmpty
+          />
+        </Form.Card>
+
+        <Form.SubmitButton />
+        <Tools.Log />
+      </Flex.Stack>
+    </Form.Handler>
+  )
+}

packages/dnb-eufemia/src/extensions/forms/Value/Upload/Upload.tsx

@@ -9,7 +9,10 @@ import ListFormat, {
 import type { UploadFile } from '../../../../components/upload/types'
 import { getFileIcon } from '../../../../components/upload/UploadFileListCell'
 import { BYTES_IN_A_MEGA_BYTE } from '../../../../components/upload/UploadVerify'
-import { Props as FieldUploadProps } from '../../Field/Upload/Upload'
+import {
+  Props as FieldUploadProps,
+  transformFiles,
+} from '../../Field/Upload/Upload'
 import { format } from '../../../../components/number-format/NumberUtils'
 import { UploadFileLink } from '../../../../components/upload/UploadFileListLink'
 import { isAsync } from '../../../../shared/helpers/isAsync'
@@ -21,8 +24,12 @@ export type Props = ValueProps<Array<UploadFile>> &
   }
 
 function Upload(props: Props) {
+  const preparedProps = {
+    fromExternal: transformFiles,
+    ...props,
+  }
+
   const {
-    path,
     value,
     format,
     className,
@@ -32,7 +39,7 @@ function Upload(props: Props) {
     displaySize = false,
     onFileClick,
     ...rest
-  } = useValueProps(props)
+  } = useValueProps(preparedProps)
 
   const list = useMemo(() => {
     const valueToUse =
@@ -62,7 +69,15 @@ function Upload(props: Props) {
         />
       )
     }
-  }, [path, value, variant, listType])
+  }, [
+    value,
+    download,
+    displaySize,
+    onFileClick,
+    format,
+    variant,
+    listType,
+  ])
 
   return (
     <ValueBlock