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ToXod(PDFDoc, String,

Convert.XODOutputOptions)

Convert the PDFDoc to XOD

format and save to the

specified path.

To specify the convert options for the conversion, the user should use the Convert.XODOutputOptions

class and pass it as a parameter in the ToXod() method. Here are all the options that can be set in

XODOutputOptions:

Name

Description

SetElementLimit

If rendering is permitted, sets

the maximum number of page

elements before that page will

be rendered. the default value

is 10000 elements

SetFlattenContent

Flatten images and paths into a

single background image

overlaid with vector text. This

option can be used to improve

speed on devices with little

processing power such as

iPads.

SetMaximumImagePixels

Specifies the maximum image

size in pixels.

SetOpacityMaskWorkaround

If rendering is permitted, sets

whether pages containing

opacity masks should be

rendered. This option is used as

a workaround to a bug in

Silverlight where opacity masks

are transformed incorrectly. the

default setting is not to render

pages with opacity masks

SetOutputThumbnails

Sets whether per page

thumbnails should be included

in the file the default setting is

to output thumbnails

SetPreferJPG

Where possible output JPG files

rather than PNG. This will apply

to both thumbnails and

document images.

SetSilverlightTextWorkaround

Outputs rotated text as paths.

This option is used as a

workaround to a bug in

Silverlight where pages with

rotated text could cause the

plugin to crash.

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SetThumbnailSize

The width and height of a

square in which all thumbnails

will be contained.

For more information, see

http://www.pdftron.com/pdfnet

. For sample code to convert PDF documents

to XOD documents, see

http://www.pdftron.com/pdfnet/samplecode.html

DocPub command-line converter

DocPub is a command-line tool that allows conversion from PDF to XOD.

The command is docpub [<options>] file. Here is a list of common options used:

--file... arg

A list of folders and/or file names to process.

-s [ --subfolders ]

Process all subfolders.

-f [ --format ] arg

The output format. The following is a list of

supported export formats:

pdf

xps (Print XPS)

xod (Web optimized XPS)

-o [ --outdir ] arg

The output directory. The folder can be relative

to the current working folder. If the folder

does not exist DocPub will attempt to create the

required path. If this parameter is not specified

all files will be saved relative to the

current working folder.

--fname arg

The explicit name for the converted file. The

parameter is used only when converting one file

at a time. The output file will be stored in the

'outdir' folder.

--extension arg

The file extension which filters the files to be

processed by the specified type.

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-p [ --pass ] arg

The password to process the input file. The

password is required only when the input

document is encrypted.

-d [ --dpi ] arg (=92)

For conversions to .xod only. The output

resolution, from 1 to 1000, in Dots Per Inch

(DPI) at which to render elements which cannot

be directly converted. The higher the DPI, the

larger the image. The default resolution is 92

DPI.

For example, here is the command used to batch convert a directory of PDF files to Web optimized

XPS (XOD):

docpub -f xod --subfolders --extension pdf mypdfdir

For more information, please see the usage documentation included in the DocPub CLI package.

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Customization Framework

The HTML5 WebViewer was designed for easy customization of the user interface and custom

features. The ReaderControl control offers a configuration file. While it is possible to customize the

Silverlight and Flash viewers as well, it is not compatible with the customization framework and will

not be discussed in this document.

Configuration Options

For common user interface customizations, WebViewer makes this easy by loading configuration

options before initializing ReaderControl. Some configurable options include hiding the toolbar, hiding

the side panel, providing a server URL for annotation saving, and alert message string.

To find out more about the options available, please see the “ReaderControl.config” in the WebViewer

HTML5 API Reference.

By default, the viewer will read the options in ReaderControlConfig.js. You can either change this

directly, or load an external configuration file.

External Configuration File

To make customizations simple and clean, you can define all your customizations in an external

JavaScript configuration file. When the query parameter “config” is provided, the viewer will

download this script dynamically.

This is the preferred way to make customizations. In fact, all the WebViewer HTML5 samples use this

method of customization. The samples show a wide range of customizations, from

changing the theme to adding custom buttons and other functionality.

Customization with PDFNet Cloud API

If you choose to use PDFNet Cloud API for your XOD conversions, your documents with be loaded

with a hosted WebViewer instance. While you cannot modify this WebViewer instance directly, you can

use the external configuration file setting to make your customizations. To do so, log in to the Cloud

API management console and set a URL path for your viewer configuration.

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Annotations and Forms

PDFTron WebViewer offers a powerful annotations framework that enables your application to have

interactive documents. The WebViewer annotation framework includes features for both markup

annotations and form widgets. Please note that this feature is only available for the HTML5 and mobile

viewers.

Markup Annotations

With the PDFTron WebViewer, users can annotate their documents freely. The annotations can be

saved to an XFDF (XML Forms Data Format) file from the WebViewer, and be loaded back into the

document next time it is opened. The WebViewer runs in a client-server architecture. Some common

use cases include:

●

creating and saving annotations for a document

●

loading annotation files (XFDF files) into a document

●

collaboration: multiple users can view the same document, adding their own annotations, while

seeing the annotations that others have added

●

merging annotations from an XFDF file into a document

●

merging annotations from different XFDF files into one single XFDF annotations file

Permission Checking

When the WebViewer first loads up a document, some user information is passed to it through the

URL. This includes the “user” and “admin” attributes. “user” specifies the user name of the current

user viewing the document, while “admin” specifies whether the user has administrative privileges.

The WebViewer has two levels of user permissions: admin and normal. Users with admin level rights

can do anything with annotations with no restrictions. Normal users on the other hand, are restricted to

editing the annotations that they put into the document. They are not allowed to modify or delete

annotations created by other users. Alerts will show up when they try to perform illegal operations on

the WebViewer. A special case is when the author of an annotation is undefined or null. In this case,

every user has permission to edit the annotation.

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Read-only Mode

Read-only mode can be enabled by passing 'true' into the 'readonly' query parameter. In read-only

mode, existing annotations on the document cannot be deleted or modified in any way, regardless of the

permission level of the current user. However, the user is still able to select them and read their popup

messages if they have any. Furthermore, new annotations cannot be added into the document. Read-

only mode ensures that existing markups are not changed and remain the only annotations on the

document.

Note that the annotations toggle button can still be used in read-only mode to toggle all the annotations

on or off.

Toggle Annotations

With the toggle annotations button located on the Annotation Panel, the user can toggle between

showing and hiding all the annotations on the currently displayed document. This is similar to changing

the query parameter 'a' which decides whether annotations are enabled, but the ability is dynamic, and

the user can switch between having annotations on or off quickly while reading the document.

By default, annotations are toggled on. Depending on the current state, the toggle annotations button

will show either 'Show' or 'Hide'. Note that when annotations are toggled off, new annotations cannot

be added to the document unless visibility is enabled again. This is to ensure that no annotations are

displayed when the user has opted to hide all annotations. Also note that while annotations do not

appear on the document or the annotations list when annotations are toggled off, they are not removed

from the document; they are merely visually removed from the viewer.

Filter Annotations

On the Annotation Panel, there is a textbox which allows user input to filter out the annotations

currently displayed on the viewer. Annotations are filtered by user name: only the annotations whose

author name contains the filter string will get displayed on the document and the annotations list on the

Annotation Panel. The filtering is dynamic and is triggered every time there is a change in the value of

the filter textbox.

Similar to toggling off of annotations, filtered annotations remain part of the document and are not

removed completely. To add back all the filtered annotations into the document, the user simply

empties the input filter textbox.

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Forms

The PDFTron WebViewer provides support for interactive forms, sometimes known as AcroForms. An

AcroForm is simply a collection of fields for gathering information interactively from the user. In a

PDF document there may be any number of fields appearing on any combination of pages. The

combined fields make up a single interactive form that can be imported or exported from the document.

During the conversion process from PDF to XOD, the form fields' name-value pairs, as well as all the

information needed to recreate the fields' appearances, are saved into the internal XFDF embedded in

the XOD document. This information that is stored inside the internal XFDF is used by the PDFTron

WebViewer to re-create the field widgets elements on the viewer.

Here are the major features of the PDFTron WebViewer form support:

●

rendering of the form field widgets as from the original PDF document

●

dynamic data entry into form field widgets

●

loading and saving of form field data

●

support for common form actions, such as submit form action, JavaScript action

Supported Field Widget Types

The PDFTron WebViewer supports all the form field types outlined in the PDF specification, except the

signature field.

Button Fields

A button field is an interactive control that the user can manipulate with the mouse. They include the

following:

●

Push button: a purely interactive control that responds to user inputs without retaining a

permanent field value

●

Checkbox: a control that can be toggled between two states: on and off

●

Radio buttons: a group of related toggles. Selecting any one from the group automatically

deselects all the others, such that at most one may be on at any given time

Text Fields

A text field is a box or space in which the user can enter text by using the keyboard.

Choice Fields

A choice field contain one or more text items, where at most one of which may be selected as the field

value. They include the following:

●

list box: a scrollable control listing all the items that can be chosen

●

combo box: a dropdown menu containing all the items that can be chosen

Supported Form Actions

The PDFTron WebViewer supports a subset of the standard PDF form action types that can be attached

to form widgets. These include the following:

Submit Form Actions

A submit form action transmits the name-value pairs of selected interactive form fields to a specified

URL, presumably the address of a server that will process the submitted data and send back a response.

The form data may be submitted in either HTML Form format, or XFDF format.

Reset Form Actions

A reset form action resets selected interactive form fields to their default values.

JavaScript Actions

A JavaScript action causes a script to be executed when the widget is clicked. The script can be any

JavaScript that is stored in the action attribute of the widget of the PDF document. When the widget is

clicked, eval() is called to execute the stored JavaScript.

Hide Actions

A hide action either hides or shows a widget element on the screen.

Note that these form actions must be attached to the field widgets before the document is converted

from PDF to XOD. The attributes describing the action are exported into the widget XFDF elements,

and the WebViewer will create appropriate event handlers upon reading these action attributes while

loading the XFDF file.

Processing Annotations and Forms

Once users create markup annotations and fill in form fields, you will want to manage and process this

data. The sections below we discuss how to save, load and merge annotation data in WebViewer.

Loading Annotations and Form Fields

The WebViewer works by loading XOD files, therefore the user needs to convert the PDF source

document into a XOD document first. During the convert process, an XFDF file is embedded into the

XOD document, which stores all the existing annotations, links, and form data of the PDF document.

When a XOD document is first loaded into the PDFTron WebViewer, it looks into the internal XFDF

embedded into the XOD document itself during the convert process, and uses that XFDF to load all of

the following stored in the XFDF: annotations, links, and form field widgets. Please note that the query

parameter 'a', which specifies whether annotations are enabled or not, must be set to 1 so that both

annotations and widgets are loaded in the viewer.

While the user can provide an external XFDF file to load annotations from in the onDocumentLoaded()

callback function in ReaderControl.js, it is important to note that this external XFDF file would replace

the internal XFDF file as the source of annotations and form data loading. That is, only the annotations

and widgets stored in the external XFDF would get loaded, while the internal XFDF would be ignored.

Therefore, if the original PDF document contains an AcroForm, the external XFDF the user provides

must contain the form field widgets information inside it as well so that the PDFTron WebViewer can

recreate the form field widgets.

Exporting Annotations and Form Fields

The WebViewer allows multiple methods of exporting annotations and form fields in order to

accommodate the different needs of users. Both annotations and form field data are exported into one

single XFDF file. Here are the 3 most common methods to export annotations.

Export to XFDF as local download

The user can download the XFDF file containing the annotations and form data of the document

directly from the WebViewer, by the use of dataURLs.

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