Nubexx UI5 PDF Viewer

The Nubexx PDF Viewer can be used on all device types (desktop, tablet and phone).

It extends the UI5 PDF Viewer (sap.m.PDFViewer), so this control can replace the SAP control transparently.
The PDF render engine is based on Mozilla's PDF.js with enhanced customizing features for this PDF viewer.

Advantages

Works in mobile browsers on phone and tablet
Extended PDF format compatibility
Visual appearance is almost identical in all browsers
Various options to manage the control via API
Client-side watermark option

Integrated Document Protection Architecture

The Nubexx PDF Viewer is engineered to bridge the significant security gaps found in standard browser-based PDF displays. Especially in HR and legal departments, preventing unauthorized local copies of sensitive data is a primary requirement. Our control achieves this through a multi-layered security approach:

1. Signature-Safe Visual Watermarking

To maintain the legal integrity of digitally signed PDFs, our viewer avoids any modification of the original file, which would otherwise break the cryptographic signature. Instead, watermarks are applied as a dynamic overlay on the PDF canvas. This ensures that the document remains legally valid while every preview and print-out is clearly marked with traceable metadata (e.g., User-ID, Timestamp).

Unlike the native sap.m.PDFViewer, which acts as a wrapper for browser-dependent plugins, the Nubexx viewer utilizes a custom toolbar. This gives developers full programmatic authority to hide or disable the Save, Download, and Print functions. Access rights can be tied directly to SAP backend permissions, ensuring that only authorized personnel can generate local copies.

3. Data Leakage Prevention: Disabling the Text Layer

For maximum protection against manual data extraction, the viewer allows the deactivation of the text selection layer. When enabled, users are prevented from highlighting and copying text via the clipboard CTRL + C.

The technical advantage: While the visual selection is disabled, the internal search functionality remains fully operational. The viewer can still navigate to specific search hits without exposing the raw text layer to the user's cursor.

4. End-to-End Encryption with In-Memory Decryption

In tandem with the Nubexx Encryption Service, document payloads are transmitted as encrypted AES-256 streams. Decryption occurs strictly within the browser's memory during the rendering process. This architecture ensures that the "plain" PDF file never hits the browser's permanent cache and is not easily accessible via the browser's network console F12, closing a common vulnerability in standard Fiori apps.

For more information about this control see the API Reference and the Examples.

tip

If you would like to see the control in action, please register to access our demo app.

Screenshots

Full control-set with watermark	Minimal control-set

Delta Chart

Comparison Nubexx vs. Standard sap.m.PDFViewer

	Nubexx PDF Viewer	SAP PDF Viewer
Supported platforms
Desktop
Tablet
Phone

Elements or functions that can be activated or deactivated
Hide toolbar by viewport size
Hide toolbar by configuration
Print
Download / Save
Open files from Open-Dialog or `STRG`+`O`
Presentation mode
Ask for filename on save	¹

Additional Functions
Enable / disable text selection / copy
Client-side watermark on Display / Print
End-to-End Encryption (AES)	²

Supported PDF file formats
Standard PDF files
PDF XFA		³
PDF portfolio	⁴	³

Installation on SAP

Import SAP transport request to target SAP Gateway/FES host
Check transaction SMW0 for existing mime types .mjs and .wasm. See next section Prerequisites for SAP.

Prerequisites for SAP

The provided transport request can be installed on SAP systems 750++. Minimum sapui5 core release is 1.71

info

Some files of this library use ECMAScript modules that are delivered as .mjs files and also .wasm files. Therefore the SAP host system must support these mime-types

So the mime-types must be added in the SAP backend (should the SAP transport request not have created them automatically)

Run transaction SMW0
Select "Web-Object" HTML Patterns for WebRFC-Applications press F8.
In view "HTML templates for WebRFC" press F8 again.
In the next view (Object type) select the menu item Settings -> Maintain mime-types
In the Mime-Types Table create a new item F5 and enter the following data and save this values.
- Type: application/javascript
- Extension *.mjs
Repeat the creation of mime-Type for .wasm
- Type: application/wasm
- Extension *.wasm

Keyboard shortcuts

Modifier Keys	Key	ASCII-Codes	Function	Note
`Ctrl`, `⌘`	`f`	70	Open Find bar
`Ctrl`, `⌘`	`g`	71	Find again
`Ctrl`, `⌘`	`+`	61, 107, 187, 171	Zoom in
`Ctrl`, `⌘`	`-`	173, 109, 189	Zoom out
`Ctrl`, `⌘`	`0`	48, 96	Zoom reset
`Ctrl`, `⌘`	`↑`	38	Go to first page
`Ctrl`, `⌘`	`↓`	40	Go to last page
`Ctrl`, `⌘`	`s`	83	Save document	if allowed
`Ctrl`, `⌘`	`o`	79	Open document	if allowed
`Ctrl`+`Alt`, `⌥`+`⌘`	`p`	89	Start full screen / presentation mode	if allowed
`Ctrl`+`Alt`, `⌥`+`⌘`	`g`	71	Focus the page number input field	if visible
	`↑`	38	moveCaret up	if caret browsing mode is supported
	`PgUp`	33	Page back
	`⌫`	8	Page back	if viewer is in presentation mode
	`←`	37	Page back	if viewer is not in caret browsing mode
	`k`	75	Page back
	`p`	80	Page back
	`Esc`	27	Close secondary toolbar, Close Find bar
	`↓`	40	Next page	if not in caret browsing mode
	`PgDown`	34	Next page
	`↵`	13	Next page
	`Space`	32	Next page
	`→`	39	Next page
	`j`	74	Next page
	`n`	78	Next page
	`Pos1`, `Home`	36	Go to first page
	`End`	35	Go to last page
	`s`	83	Activate cursor tool
	`h`	72	Activate hand tool
	`r`	82	Rotate clockwise
	`F4`	115	Toggle sidebar
`Shift`	`↵`	13	Page back
`Shift`	`Space`	32	Page back	if in presentation mode and zoom = "page-fit"
`Shift`	`↑`	38	moveCaret up
`Shift`	`↓`	40	moveCaret down
`Shift`	`r`	82	Rotate anti-clockwise

This function is provided by the file system access API (showSaveFilePicker()) and will not work in all browsers like Firefox, Safari, Samsung Internet, WebView on iOS, Deno etc. In unsupported browsers the default behavior is used. ↩
In combination with the Nubexx Encryption Service. Documents are encrypted on the server and decrypted strictly in-memory within the viewer, preventing unauthorized access via browser cache or network console. ↩
Usually also works in Firefox. ↩ ↩²
Files of the portfolio will open in a new window. ↩

Advantages​

Integrated Document Protection Architecture​

1. Signature-Safe Visual Watermarking​

2. Advanced Toolbar & Save-Button Control​

3. Data Leakage Prevention: Disabling the Text Layer​

4. End-to-End Encryption with In-Memory Decryption​

Screenshots​

Delta Chart​

Installation on SAP​

Prerequisites for SAP​

Keyboard shortcuts​

Footnotes​