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JavaScript programming in PDF
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You ve already introduced JavaScript into your PDF files in section 7.1.3. You ve added document-level JavaScript, and you ve created JavaScript actions triggered from a link annotation or an event. But that isn t the whole story. You didn t know you were using annotations at the time. Now that you do, you can do more cool things. At the end of this section, you ll even create a calculator application in a PDF. Along the way, you ll meet new types of annotations.
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Triggering JavaScript from a button The next chapter will be dedicated entirely to interactive forms. Forms consist of fields, and fields are visualized using a special type of annotations: widget annotations. In this section, we won t create a fillable form yet, but we ll experiment with the interactive features of widget annotations. In a first example, we ll stamp the timetable PDF once again. We ll add two buttons at the bottom of the page to trigger menu actions.
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Listing 7.26 ButtonsActions
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PdfReader reader = new PdfReader(src); int n = reader.getNumberOfPages(); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
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JavaScript programming in PDF
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PushbuttonField saveAs = new PushbuttonField(stamper.getWriter(), new Rectangle(636, 10, 716, 30), "Save"); saveAs.setBorderColor(BaseColor.BLACK); Creates saveAs.setText("Save"); pushbutton saveAs.setTextColor(BaseColor.RED); object saveAs.setLayout(PushbuttonField.LAYOUT_LABEL_ONLY); saveAs.setRotation(90); PdfAnnotation saveAsButton = saveAs.getField(); saveAsButton.setAction( PdfAction.javaScript("app.execMenuItem('SaveAs')", stamper.getWriter())); PushbuttonField mail = new PushbuttonField(stamper.getWriter(), new Rectangle(736, 10, 816, 30), "Mail"); mail.setBorderColor(BaseColor.BLACK); Obtains mail.setText("Mail"); annotation mail.setTextColor(BaseColor.RED); from mail.setLayout(PushbuttonField.LAYOUT_LABEL_ONLY); pushbutton mail.setRotation(90); PdfAnnotation mailButton = mail.getField(); mailButton.setAction( PdfAction.javaScript("app.execMenuItem('AcroSendMail:SendMail')", stamper.getWriter())); for (int page = 1; page <= n; page++) { stamper.addAnnotation(saveAsButton, page); Adds stamper.addAnnotation(mailButton, page); annotations } stamper.close();
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You re no longer using a static method of PdfAnnotation to create an instance. Instead, you use a convenience class named PushbuttonField. This class allows you to define the layout of the annotation in a programmer-friendly way. Once you re done, you use getField() to obtain the corresponding PdfAnnotation object, and you can add a JavaScript action. The JavaScript method execMenuItem() executes a menu item in Adobe Reader. In this case, clicking the buttons will have the same effect as if the user selected File > Save a Copy, and File > Attach to Email. You ve created buttons with a layout that only contained text (LAYOUT_LABEL_ ONLY). In the next example, we ll look at how to introduce icons.
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Showing and hiding an annotation Do you also hate the aggressive advertisements that prevent you from viewing a web page unless you click a button to make them disappear If that s the case, I have bad news for you. I once talked to a manager responsible for a large newspaper group in a very small country (Belgium). I bragged that The New York Times had used iText to publish newspaper archives on the internet in the form of PDF documents. The manager said: Well, that s nice, but we can t do that. We have to make money with our content, and it s almost impossible to add ads to a PDF file. We can only do that in HTML. I immediately created the PDF shown in figure 7.13 to prove him wrong.
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Making documents interactive
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Figure 7.15 An advertisement that can be clicked away, added to an existing document
You ll recognize the original PDF from chapter 4, but I ve added a shameless ad to promote this book on top of the existing content. The user can make it disappear by clicking the top bar. The ad consists of two button fields.
Listing 7.27 Advertisement
Rectangle rect = new Rectangle(400, 772, 545, 792); PushbuttonField button = new PushbuttonField( stamper.getWriter(), rect, "click"); button.setBackgroundColor(BaseColor.RED); button.setBorderColor(BaseColor.RED); button.setFontSize(10); button.setText("Close this advertisement"); button.setImage(Image.getInstance(IMAGE)); button.setLayout( PushbuttonField.LAYOUT_LABEL_LEFT_ICON_RIGHT); button.setIconHorizontalAdjustment(1); PdfFormField menubar = button.getField(); String js = "var f1 = getField('click'); f1.display = display.hidden; var f2 = getField('advertisement'); f2.display = display.hidden;"; menubar.setAction( PdfAction.javaScript(js, stamper.getWriter())); stamper.addAnnotation(menubar, 1); rect = new Rectangle(400, 550, 545, 772); button = new PushbuttonField( stamper.getWriter(), rect, "advertisement"); button.setBackgroundColor(BaseColor.WHITE); button.setBorderColor(BaseColor.RED); button.setText( "Buy the book iText in Action 2nd edition"); button.setTemplate(stamper.getImportedPage(ad, 1)); button.setLayout( PushbuttonField.LAYOUT_ICON_TOP_LABEL_BOTTOM); PdfFormField advertisement = button.getField(); advertisement.setAction( new PdfAction("http://manning.com/lowagie2/")); stamper.addAnnotation(advertisement, 1);
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