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Page open close action

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfAction; import com.lowagie.text.pdf.PdfWriter; public class MainClass {   public static void main(String[] args) throws Exception {     Document document = new Document();     PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));     document.open();     document.add(new Paragraph("alert messages."));     writer.setPageAction(PdfWriter.PAGE_OPEN, PdfAction.javaScript(         "app.alert('You have reached page 3');\r", writer));     writer.setPageAction(PdfWriter.PAGE_CLOSE, PdfAction.javaScript(         "app.alert('You have left page 3');\r", writer));     document.add(new Paragraph("Page 3"));     document.close();   } }