docs(PdfViewer): add form filling docs (#3098)

* docs(PdfViewer): add form filling docs

* chore(PdfViewer): apply suggestions as per comments

Author: xristianstefanov

components/pdfviewer/form-filling.md

@@ -0,0 +1,33 @@
+---
+title: Form Filling
+page_title: PDFViewer - Form Filling
+meta_title: Form Filling | PDFViewer for Blazor
+position: 17
+description: "Enable users to fill and submit PDF forms in the Blazor PDFViewer."
+tags: telerik,blazor,pdfviewer,form filling,forms
+slug: pdfviewer-form-filling
+---
+
+# Form Filling
+
+The PDFViewer enables users to fill interactive forms directly in PDF documents. You can display and edit form fields such as text boxes, checkboxes, radio buttons, and dropdowns.
+
+## Supported Form Fields
+
+The PDFViewer supports the following form field types:
+
+* `TextBox`
+* `CheckBox`
+* `RadioButton`
+* `DropdownList`
+* `ListBox`
+* `Button`
+
+>caption Edit form fields and download the updated PDF file
+
+<demo metaUrl="client/pdfviewer/form-filling/" height="420"></demo>
+
+## See Also
+
+* [PDFViewer Overview](slug:pdfviewer-overview)
+* [PDFViewer Events](slug:pdfviewer-events)

components/pdfviewer/overview.md

@@ -63,6 +63,10 @@ The [PdfViewer toolbar can render built-in and custom tools](slug:pdfviewer-tool
 
 The PdfViewer provides a built-in option for creating and editing annotations. Explore the [available annotation types and how to work with them](slug:pdfviewer-annotations).
 
+## Form Filling
+
+The PdfViewer supports interactive form filling in PDF documents. You can display and edit form fields such as text boxes, checkboxes, radio buttons, and dropdowns. For more details and examples, see the [Form Filling documentation](slug:pdfviewer-form-filling).
+
 ## Large File Support
 
 In Blazor **Server** apps, the PDF Viewer uses the **SignalR WebSocket** to:
@@ -81,6 +85,7 @@ The table below lists the PDF Viewer parameters. Also check the [PDF Viewer API
 
 | Parameter | Type and Default Value | Description |
 | --- | --- | --- |
+| `AnnotationMode` | `PdfViewerAnnotationMode` <br /> (`Disable`) | Specifies how the PDFViewer handles [form fields](slug:pdfviewer-form-filling) in the loaded document. |
 | `Class` | `string` | An additional CSS class for the `<div class="k-pdf-viewer">` element. Use it to [customize the component styles and override the theme](slug:themes-override). |
 | `Data` | `byte[]` | The source of the currently displayed PDF file. |
 | `EnableLoaderContainer` | `bool` <br /> (`true`) | Determines if the PDF Viewer will show a loading animation during opening, downloading or zooming a PDF file. |
@@ -100,6 +105,7 @@ The PdfViewer exposes methods for programmatic operation. To use them, define a
 | --- | --- |
 | `Print` | Prints the loaded PDF document as an alternative to the [built-in Print button in the PDF Viewer toolbar](slug:pdfviewer-toolbar#built-in-tools). |
 | `Rebind` | Refreshes the PDF Viewer and ensures it is displaying the latest file `Data`. [`Rebind` is necessary when the Blazor framework cannot re-render components automatically](slug:common-features-data-binding-overview#refresh-data). |
+| `GetFileAsync` | Asynchronously retrieves the current PDF file data as a byte array, including any annotations or form filling changes. Returns a `Task<byte[]>`. Returns `null` if no document is loaded. |
 
 >caption PDF Viewer reference and method usage