@botz1991/ngx-extended-pdf-viewer NPM

ngx-extended-pdf-viewer

What's new in version 4.0?

Version 4.0 is a major internal change. Now it's easier to update to the latest version of pdf.js. Your benefit is that you can finally use the minified pdf.js libraries. You'll notice the performance boost. There's also a new option in the findbar: "fuzzy search" is slow but useful if just ignoring diacritics and accents isn't enough flexibility.

Breaking changes

defaultOptions has been renamed to pdfDefaultOptions. You'll also have to modify the import statement.

New: transition to a UI design inspired by Material Design (work in progress)

Version 3.0.0 comes with a slightly modified design. That's work in progress. The goal is to give you a highly customizable, easily themeable library with a fresh and modern look inspired my Material Design. As an unintended side effect, it resembles the redesign called "Photon" of pdf.js. Among other things, you'll soon be able to select between the light mode and the dark mode.

Talking of which: if you're a UX- or UI-designer with some time to spear, don't hesitate to send me suggestions on how to improve the look and feel of the library. Or send me your complaints if you don't like my attempts at UI-design. I can't promise to implement every suggestion, but I'm looking forward to your valuable feedback!

Showcase and manual

There's a showcase at https://pdfviewer.net. Check this page for live demos, source code examples, and a handbook.

Bringing PDF to the Angular world

This library provides an embeddable PDF viewer component. It's different from other approaches like ng2-pdf-viewer in that it shows the full suite of UI widgets. In other words, it strongly resembles the PDF viewer of your browser:

Features

Support for Internet Explorer 11
Searching (including a programmatic API)
Printing
Sidebar with thumbnails, outlines, and attachments
Rotating
Download and upload
Zoom (with optional two-way binding to an attribute)
Full-screen mode
various selection tools
standard display or even / odd spreads (like a book)
several event listeners
multiple approaches to scrolling (vertical, horizontal, "wrapped" scrolling)
Internationalization (providing translations to several dozen languages)
direct access to the core API of pdf.js (including TypeScript definition files)
plus the ability to deactivate each of these features
and to customize the toolbars and menus according to your needs.

Not to mention the ability to display PDF files, running on Mozilla's pdf.js 2.4.456, released in March 2020. If you're the daring one, you can also use the developer version 2.5. It's bleeding edge, so use it at own risk, but it fixes at least one bug (#285), so it may be worth a look.

Alternatives

There's also a direct counterpart to my library: ng2-pdfjs-viewer. As far as I can see, it's also a good library. Recently (May 24, 2019), it has been updated to PDF.js 2.2.171. It wraps the PDF viewer in an iFrame. That's a more reliable approach, but it also offers fewer options. The list of attributes is shorter, and the PDF viewer can't emit events to your application. If you're not happy with my library, check out ng2-pdfjs-viewer. It's a good library, too. Its unique selling point is displaying multiple PDF files simultaneously on the same page.

You might also try to use the native PDF viewer of your browser. That's a valid approach. It's even the preferred approach. The advantages of both ngx-extended-pdf-viewer and ng2-pdfjs-viewer are they also support Internet Explorer 11 (with some help of the polyfills). ngx-extended-pdf-viewer also gives you a wide range of options that aren't available using the native API.

How to use the library

As a rule of thumb, I recommend cloning the showcase project from GitHub before doing anything else. It's a standard Angular CLI application, so you'll get it up and running in less than ten minutes. It's a good starting point to do your own experiments. Maybe even more important: you'll learn if the library works on your machine. (Of course, it does, but it's always good to double-check!)

The detailed instructions for JHipster and Angular 2, 4, and 5 are available on the showcase.

Install the library with npm i ngx-extended-pdf-viewer --save
Open the file angular.json (or .angular-cli.json if you're using an older version of Angular) and configure Angular to copy the assets folder of the library into the assets folder of your application:
```
  "assets": [
    "src/favicon.ico",
    "src/assets",
    {
      "glob": "**/*",
      "input": "node_modules/ngx-extended-pdf-viewer/assets/",
      "output": "/assets/"
    }
  ],
  "scripts": []
```
This simply copies the entire assets folder. If you're concerned about disk memory, you can omit the subfolders inline-locale-files and additional-locale. If you need only one language, you can reduce the list to locale.properties and your language folder.
If you want to use the developer preview of pdf.js 2.5, add a second import like this:
```
"assets": [
  "src/favicon.ico",
  "src/assets",
  {
    "glob": "**/*",
    "input": "node_modules/ngx-extended-pdf-viewer/assets/",
    "output": "/assets/"
  },
  {
    "glob": "**/*",
    "input": "node_modules/ngx-extended-pdf-viewer/assets-2.5/",
    "output": "/assets/"
  }
],
"scripts": []
```
Hint: There are two ways to define the language files needed for the labels of the buttons and screen elements. The second method is described below in the "internationalization" section.

Now you can display the PDF file like so:

<ngx-extended-pdf-viewer [src]="'assets/example.pdf'" useBrowserLocale="true" height="80vh"></ngx-extended-pdf-viewer>

If you want to display a PDF file you have downloaded from a server, you probably have a Blob or a Base64 encoded string. Blobs can be passed directly to the attribute [src]. Base64 string must be passed to the attribute [base64Src] instead.

Configuration

Do you miss a configuration option? File an issue on the project bug tracker. If the base library pdf.js supports the requested option, I'll probably add it. BTW, you can speed up the process by providing a code snippet telling me how to implement the feature or by submitting a pull request.

Legend:

(attribute) describes an attribute with two-way-binding
attribute means that PDF-viewer reacts when the attribute changes
(attribute) means an event is raised when the user changes a setting
attribute (without special characters) means the attribute is used at load time only. Subsequent changes are ignored.

Also see the attribute list on the showcase. It's the same list, just a little more useful because the showcase doesn't truncate the table on the right-hand side.

Attribute	default value	description
(src)		If `[src]` is a string: defines the URL of the PDF file to display. `src` may also be a `Blob`, a `Uint8Array` or an `ArrayBuffer`. To a limited extend, `[(src)]` is also a two-way binding attribute. If the user opens another PDF file, the event (srcChange) is fire. There's a catch: for security reasons, most browsers don't display the correct filename. Most often than not, the path is `C:\fakepath\`. The (srcChange) event removes the fakepath bit of the path. The $event attribute is simply the filename. But don't rely on it: it's up to the browser to implement that feature, and if you add the page to the "trusted pages" list in the Internet Explorer, the fully qualified file name is provided.
base64Src		accepts a PDF file as base64 encoded string
(afterPrint)		This event is fired after the print jov has either been sent to the printer, or after the user has cancelled the print job. Note there's no way to tell printing from aborting the print.
authorization	undefined	This attribute is designed to activate server-side authorization. If this attribute has a value, the attribute `withCredentials` is set to true. If you're using Keycloak, you can pass the bearer token with this attribute. Note that you have to add the prefix "Bearer: " (with a capital B and a trailing space). To support other authorization servers, you can also set additional headers using the attribute `[httpHeaders]`.
(beforePrint)		This event is fired when the print is initiated. Note that this simply means the print preview window is opened. There's no way to predict if the user is actually going to print.
backgroundColor	?	background color
contextMenuAllowed	true	should the context menu show when the right-hand side button is clicked?
(currentZoomFactor)	n/a	fires each time the viewer changes the zoom level. The parameter is the numeric scale factor. Note that it's not a percentage; instead, `[zoom]="'100%'"` results in `(currentZoomFactor)` sending a value of `1.0`. This event seems to fire often enough to make it reliable for detecting the current zoom factor all the time.
customFindbarInputArea	(none)	Allows you to customize the pop-up dialog that opens when you click the "find" button. See https://pdfviewer.net/custom-toolbar.
customFindbarButtons	(none)	Allows you to customize the pop-up dialog that opens when you click the "find" button. See https://pdfviewer.net/custom-toolbar.
customSecondaryToolbar	(none)	Allows you to replace the kebab menu on the right-hand side with your custom menu.
customSidebar	(none)	Allows you to replace the entire toolbar with your own custom toolbar. See https://pdfviewer.net/custom-sidebar.
customThumbnail	(none)	Allows you to implement custom thumbnails in the sidebar. See https://pdfviewer.net/custom-thumbnails.
customToolbar	(none)	Allows you to replace the entire toolbar with your own custom toolbar. See https://pdfviewer.net/custom-toolbar.
customFreeFloatingBar	(none)	Allows you to add a toolbar you can place anywhere on the PDF viewer. The original use case was to let the zoom controls hover as a separate window at the bottom of the PDF file. See https://pdfviewer.net/custom-toolbar.
delayFirstView	0	Number of milliseconds to wait between initializing the PDF viewer and loading the PDF file. Most users can let this parameter safely at it's default value of zero. Set this to 1000 or higher if you run into timing problems (typically caused by loading the locale files after the PDF files, so they are not available when the PDF viewer is initialized).
enablePinchOnMobile	false	By default, the pinch gesture zooms the entire window on mobile devices. If you prefer to zoom the PDF viewer only, you can activate `enablePinchOnMobile="true"`.
enablePrint	true	Setting this flag to false disables printing the PDF file.
filenameForDownload	document.pdf	Allows the user to define the name of the file after clicking "download"
(handTool)	true	setting this flag to true, activates the "hand tool" to scroll the PDF file by dragging. Setting this to false activates the "text selection" tool. You can also use this flag as a two-way binding attribute. If you're only interested in the event, the event name is `(handToolChange)`. Deactivating this flag also activates the "text layer". This, in turn, enables marking text and highlighting search result.
height	(see text)	define the height of the PDF window. By default, it's 100%. On most web pages, this results in a height of 0 pixels. In this case, the height is set to fill all the available space. More precisely, the all the space to the bottom of the window. If that's less then 100 pixel, the height is set to 100 pixel. Note that this is just an initial setting. It doesn't change when the window is resized.
httpHeaders	(none)	If you pass a JSON object to `httpHeaders`, the content of the JSON object is sent to the server as an array of additional httpHeaders.
ignoreKeyboard	false	if this flag is set to true, the PDF viewer ignores every keyboard event.
ignoreKeys	(none)	Accepts a comma-separated list of keys. For example, a legal value is `"['P', 'N']"`. Every key in the list is ignored. In the example, the key "k" navigates to the next page but "n" does not.
acceptKeys	(none)	Accepts a comma-separated list of keys. For example, a legal value is `"['P', 'N']"`. Every key in the list is accepted, and every other key is ignored. In the example, the key "n" navigates to the next page but "k" does not.
~~ignoreResponsiveCSS~~	n/a	This property has been removed in version 3.0.0-beta.6.
imageResourcesPath	./assets/images	allows you to put the viewer's SVG files into an arbitrary folder.
language	undefined	Language of the UI. Must the the complete locale name, such as "es-ES" or "es-AR". It may be all lowercase.
listenToURL	false	deactivates the URL listener of the PDF viewer. You can set it to "true" to allow for anchor tags like "#page=23" or "#nameddest=chapter_3". Only activate this flag if you don't use the anchor to encode the URLs for the router.
logLevel	1	Log level. Legal values: VerbosityLevel.ERRORS (=0),VerbosityLevel.WARNINGS (=1), and VerbosityLevel.INFOS (=5). The higher the log level, the more is logged. Please note that the log level is only updated when a new PDF document is loaded programmatically (i.e. when `[src]`changes).
nameddest	undefined	allows you to jump to a "named destination" inside the document. Typical examples of names destinations are "chapter_7" oder "image_3". The named destination are defined within the PDF document; you can only jump to destinations defined by the author of the PDF file.
showSidebarButton	true	Show or hide the button to toggle the sidebar
minifiedJSLibraries	true	Since version 4.0.0, ngx-extended-pdf-viewer loads the minified pdf.js libraries by default. You can set this flag to load the human-readable files. In most cases this shouldn't be necessary due to the source map files, but sometimes the debugger doesn't cope well with the sourcemaps. Caveat: Using the human-readable files gives you a performance penalty.
minZoom	0.1	Minimum zoom factor you can achieve by pinching or by hitting the "-" button or the "+" key.
maxZoom	10	Maximum zoom factor you can achieve by pinching or by hitting the "+" button or the "+" key.
mobileFriendlyZoom	100%	Increases the size of the UI elements so you can use them on small mobile devices. Must be a percentage (`'150%'`) or a floating-point number (`'1.5'`). Alternatively you can set this attribute to `'true'` (= `'150%'`) or `'false'` (= `'100%'`).
password	undefined	Allows you to pass a password programatically. If you pass the wrong password, a red error message claiming "corrupt pdf file" is show in below the toolbar. Caveat: the password must be a string. During my test I accidentially used a numerical value. This fails even if the password consists only of digits. Please note that the password is stored in the main memory without encryption. If you're really serious about protecting your user's data from hackers, this might be a security issue. Please note that the log level is only updated when a new PDF document is loaded programmatically (i.e. when `[src]`changes).
(page)	undefined	two-way binding attribute to determine the page to display; more precisely: `[page]="25"` makes the PDF viewer show page 25 (at any time - even after load time); `[(page)]="attribute"` updates the attribute each time the user scrolls to another page. If you're only interested in the event, that's `(pageChange)`.
(pageLabel)	undefined	two-way binding attribute to determine the page to display; more precisely: `[pageLabel]="25"` makes the PDF viewer show the page the author called page "25". This may or may not be a numeric value. For instance, many books use roman numbers for the preface and arab numbers for the rest of the document. In this case, `[pageLabe]="iv"` usually refers to the same page as `[page]="4"`. `[(pageLabel)]="attribute"` updates the attribute each time the user scrolls to another page. If you're only interested in the event, that's `(pageLabelChange)`.
(pagesLoaded)	undefined	emits the number of pages when a document is loaded; more precisely: emits an instance of `PagesLoadedEvent`. The attribute `pagesCount` tells how many pages the document has. The source attribute contains a reference to the PDF viewer. You can also use this event to detect when a document has been loaded.
(pageRendered)	undefined	fires each time a page is rendered. Emits an instance of `PageRenderedEvent`. The `pageNumber` attribute tells you which page has been rendered.
(pdfDownloaded)	undefined	fires when a user downloads a document. Strictly speaking, it fires when they click the "download" button. Caveat: Even if the user cancels the download, the event is fired.
(pdfLoaded)	undefined	emits when the PDF file has been load successfully. The paramter \$event is an `PdfLoadedEvent`, containing the number of pages of the PDF file.
(pdfLoadingFailed)	undefined	emits when trying to load and open a PDF file has failed. The parameter `$event` is an `Error`, which may or may not contain the stacktrace and additional info about the root cause of the error.
printResolution	150	set the print resolution in DPI. Sensible values are 300, 600, and maybe even 900. Note that higher values result in more memory consumption, more CPU uses, and may even cause browser crashes. During my tests setting the resolution to 1100 dpi worked, but 1150 failed. In my case, the browser seemed to ignore the print request without displaying any error message.
showBorders	true	By default, the PDF file is displayed with page borders. You hide them by setting `[showBorders]="false"`. Note that the page borders can be switched off and on even after the PDF file is diplayed, but if you're using one of the zoom presets (`auto`, `page-width` etc.), the page isn't resized correctly.
(rotation)	0	rotation allows you to rotate every page. Note that this attribute is not responsible to rotate individual pages - it always rotates the entire document. (rotationChange) notifies you when the user rotates the document. This attribute can be used as a two-way binding attribute, i.e. (rotation)="angle". Legal values are 0, 90, 180, and 270. Every other value is ignored.
showBookmarkButton	true	Show or hide the "bookmark" button
showDownloadButton	true	Show or hide the "download" button (aka "save" button)
showFindButton	true	Show or hide the "find" button
showHandToolButton	false	Show or hide the "hand tool" menu item in the secondary toolbar. (The hand tool allows you to move the page by clicking and dragging). This activates also the opposite menu item: "text selection tool". As a side effect, the hand tool also activates the "text layer". This, in turn, enables marking text and highlighting search result.
showOpenFileButton	true	Show or hide the "open file" button
showPagingButtons	true	Show or hide the buttons to navigate between pages and the input field to navigate to a particular input field
showPresentationModeButton	true	Show or hide the "full screen" button
showPrintButton	true	Show or hide the "print" button
showPropertiesButton	true	Show or hide the "show document properties" menu item in the secondary toolbar
showRotateButton	true	Show or hide the "rotate" menu items in the secondary toolbar
showScrollingButton	true	show or hide the button switching between horizontal and vertical scrolling
showSecondaryToolbarButton	true	Show or hide the secondary toolbar (the menu hiding behind the arrows at the right-hand side)
showSelectToolButton	n/a	This attribute has been removed with version 0.9.47. Use showHandToolButton instead.
showSidebarOnLoad	undefined	If this flag is set to "false", the sidebar is hidden until the user clicks the "show sidebar" button. If this flag is set to "true", the sidebar is shown (unless `[showSidebarButton]="false"`). If the flag is `undefined`, the setting used when the PDF file was shown previously is used. Note that since version 1.5.0, there's also an attribute `[(sidebarVisible)]`. If the new attribute has a value, it always overrides `showSidebarOnLoad`.
showSpreadButton	true	Show or hide the "spread" menu items in the secondary toolbar. Also see the attribute `[(spread)]` below.
showZoomButtons	true	Show or hide the "zoom" area (containing of the buttons "+" and "-" and the dropdown menu)
(sidebarVisible)	undefined	Two-way-binding attribute determining whether the sidebar is visible. If you're only interested in the event, the event name is `(sidebarVisibleChange)`. Note that there's an overlap with the attribute `showSidebarOnLoad`. The value of `showSidebarOnLoad` is only considered if the attribute `sidebar` is undefined.
(spread)	off	determines if you're seeing one page or two pages at once (like a paper book). `'off'` means there's only one page. `'odd'` is the traditional book-like view, with two pages side-by-side. `'even'` is similar, only the first page is displayed alone.

PDF pdfjs PDF viewer Angular ng2 Angular 7 Angular 8 Angular 9 Angular 10 customizable PDF viewer

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