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Starting line in core. The above 4 setup Let's look at them one by one. Usually, radio buttons come with a group so that only one can be selected at one time. Based on PDF spec, each radio button in a radio group is defined as a Widget Annotation, and their group name is the item. The only additional information we need is the "value" associated with each radio, here is how we get it:. We're going to talk about how these item.
Let's move on to PushButton parsing. One is the button label, another is the button action.
More details are in the code:. The purpose of extending CheckBox parsing is to get the "value" associated with the field. Here is the code:. The dropdown or combobox element have a list of item, each item's labels is shown to the user and corresponding "value" is the actual data representation of the selection. PDF stores these information in one dictionary entry as a string array, it makes parsing dropdown to be the simplest:.
With the help of PDF. JS, we can render the PDF read-only parts in canvas and we also extended it to parse out form elements information. Let's see how we use these information to layout HTML forms on top of canvas. Checkbox tag shares the same HTML input template with text input, radio and push buttons, since their only difference is the type attribute values.
Here below is the definition of input template:. Once each item completes the same process, we get an interactive forms laid out on top of PDF content drawn in canvas. JS, also have interactive form parsed and laid out, next step is to bind data to the form. Since we are building a PDF form based web application, our goal is not just viewing PDF, we need to enable the interactivity between forms and users for data exchange.
In real world use case, end user needs to be authenticated then connected to database to retrieve user specific dat. For demonstration purpose, I'll omit this step and just to prove the data binding is viable and reliable in this approach by using DOM storage as the data store.
You can simply replace the DOM data store with Ajax calls for a fully integrated web application. Form data binding involves two aspect, one is to wire up form element's change event in a form agnostic way, and save the user data to the data store when navigate away.
The above approach follows the "separation of concerns" principle, not only to separate out logic user data processing usually in server and presentation client side only , but also to separate out template data PDF file and user data within the presentation layer.
Since the template data is the same for all users those PDF forms and public, while user data is user specific and secure, this further separation makes content and logic to be able to developed in parallel, and using the web app to glue every piece together in a loosed couple way.
Let's take a look at the first part of form data binding: The form ID based storage key will allow us to retrieve the user data back when a new form loads.
UP to now, we have a fully functioned, data bound PDF based interactive form with navigation running within the browser without plugin. The evolution of web and technology always renders some technique obsolete while providing new options to enable great customer experience in a more efficient and secure way.
Beyond the excitement about new capabilities in browsers and HTML5, there are some notes and issues I'd like to point out:. The good news is that those features are gradually adding in, and if not, there is always some alternative options, like Chrome Frame or HTML5 ployfills , etc.
As for the PDF. Besides it's not supporting interactive forms, it renders all text content in canvas, which make it un-selectable, since canvas is pixel based, it might be an issue when accessibility is required.
I'd love to see PDF. The sample project comes with this article is really the first attempt to parse, render, layout and data bound interactive forms. Even for AcroForm, not all elements attributes are fully parsed and utilized, like input constrains max length, digit only, etc.
More works to follow later on. With all that said, it's still exciting to see the browser has growing capabilities to process binary data via typed array and XHR 2, running certain logic asynchronously in Web Worker, drawing graphics and text in canvas, and blending with other HTML content seamlessly with interactivity.
Stats Licenced CPOL. Modesty Zhang , 2 Oct Rate this: Please Sign up or sign in to vote. Background PDF format became an ISO standard in , it's well defined and documented, we're not going to discuss PDF format, instead, we're going to focus on the interactive form elements parsing and rendering on top of PDF.
Here is the code for PDFView 's render function: Extending PDF. The only additional information we need is the "value" associated with each radio, here is how we get it: More details are in the code: PDF Spec p.
PDF Spec: Here is the code: PDF stores these information in one dictionary entry as a string array, it makes parsing dropdown to be the simplest: F4F3EA; z-index: Here below is the definition of input template: Data Binding to Forms Since we are building a PDF form based web application, our goal is not just viewing PDF, we need to enable the interactivity between forms and users for data exchange.
Event Binding Let's take a look at the first part of form data binding: Wrap Up The evolution of web and technology always renders some technique obsolete while providing new options to enable great customer experience in a more efficient and secure way. Beyond the excitement about new capabilities in browsers and HTML5, there are some notes and issues I'd like to point out: Modesty Zhang. Technical Lead.
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If you have questions when implementing or using the library, ask about it in StackOverflow. Pull requests are very welcome! Make sure your patches are well tested: PDF Printing Print. PDF files must be served from the same domain as your app is hosted under.
This helps preventing Cross-site scripting XSS attacks. Example Add a button to print a PDF file located on your hosting server: There is an open bug in Mozilla's website about this.
When using Firefox, Print. Load images on your page with just the necessary resolution you need on screen: Print Image With Header. Print Multiple Images.
When set to false, the library will not process styles applied to the html being printed. Useful when using the css parameter. By default, the library process some styles only, when printing HTML elements. This option allows you to pass an array of styles that you want to be processed.