This can be achieved with the search object using code in listing 3. Let’s say the movies are sorted by date and time, but you’d like to offer extra functionality that allows the end user to search for the occurrence of a specific director in the document. Suppose you had a day-to-day overview of all the movies that are screened at a festival. It works, but the addJavaScript() method should only be used to add JavaScript functions that can be called from a JavaScript action. Note that what we’re doing in listing 1 and 2 isn’t very elegant. Stamper.addJavaScript(Utilities.readFileToString(RESOURCE)) New PdfStamper(reader, new FileOutputStream(RESULT)) PdfReader reader = new PdfReader(HelloWorld.RESULT) Listing 1 was added to an existing PDF document using the code in listing 2. In our example, we print the value of the viewerType and viewerVersion property of the application (the app object) to the console.įigure 1 shows that I’ve opened the document in Adobe Reader version 9.2. It was introduced in Adobe Reader 7.0 to report errors and show messages. The console is an object that originally wasn’t available in Adobe Reader-only in Acrobat.
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I will provide an example of how to generate a PDF using the library and some methods for testing PDF content. Listing 1 is an example of a simple script that clears the JavaScript console window, makes it visible, and writes information about the viewer and its version number.Ĭonsole.println("You are using: " + app.viewerType) Ĭonsole.println("The version of " + app.viewerType In this article, I will introduce the latest version of the iText 7 library.
To add iText into your application, include the following maven repository into our pom.xml file.
There are many more features available with iText which I will leave on you to explore. We’re going to use some of the objects listed in that reference to learn how to introduce JavaScript in a PDF document using iText. The iText library contains classes to generate PDF text in various fonts, create tables in PDF documents, add watermarks to pages, and so on.
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If you want to know more about the complete set of objects and functions, you can download the PDFs “Developing Acrobat Applications Using JavaScript” and the “JavaScript for Acrobat API Reference” from the site. The most recent versions of Acrobat and Adobe Reader (since 8.0) use JavaScript 1.6. Since Acrobat 5.0, the API is based on JavaScript 1.5. There’s a JavaScript API for PDF documents that extends the core Client-Side JavaScript specification and gives you access to Acrobat and Adobe Reader objects. JavaScript is also available in PDF viewers such as Adobe Reader. It allows programmatic access to objects within the web browser. JavaScript is a scripting language that is primarily used to add client-side functionality to an HTML page and to create dynamic web sites. When mobile formats become available all customers will be contacted and upgraded. All pBook purchases include free PDF, mobi and epub. Manning publishes MEAP (Manning Early Access Program,) eBooks and pBooks. It is being reproduced here by permission from Manning Publications. This article is based on iText in Action, Second Edition, published on October, 2010.
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