How can I set the tab order option on a PDF document using programming code?

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To set the tab order option on a PDF document using programming code, you can use the following steps:

1. Open the PDF document using a programmatic PDF library, such as iText or PDFBox.
2. Retrieve the page object on which you want to set the tab order option.
3. Set the page object's /Tabs property to a new TabOrder object, which specifies the order in which focus moves through the interactive elements on the page.
4. You can use several different methods to set the tab order, including:

• Explicit order: set the /S property of the TabOrder object to "/R", and then add individual elements to the /O array in the desired tab order.
• Order by rows or columns: set the /S property of the TabOrder object to "/C" or "/S", respectively, and then add the elements in the desired order.
• Automatic order: set the /S property of the TabOrder object to "/A", and the PDF viewer will automatically determine the order based on the spatial relationships of the interactive elements.

1. Save the modified PDF document.

Here is an example code snippet using iText in Java:

PdfReader reader = new PdfReader("input.pdf"); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("output.pdf"));

// Get the first page of the PDF PdfDictionary page = reader.getPageN(1);

// Create a new TabOrder object for the page and set its /S property to "/R" PdfArray tabOrder = new PdfArray(); tabOrder.add(PdfName.R);

// Define the tab order of the page by adding elements to the /O array PdfArray tabArray = new PdfArray(); tabArray.add(new PdfName("firstElement")); tabArray.add(new PdfName("secondElement")); tabArray.add(new PdfName("thirdElement")); tabOrder.add(tabArray);

// Set the /Tabs property of the page to the new TabOrder object page.put(PdfName.Tabs, tabOrder);

// Save the modified PDF document stamper.close(); reader.close();