How to enable annotation in PDFJS viewer - pdf.js

Question

I am using PDFJS and the viewer. I do however have the problem that annotation are not shown correctly like the are in the pdfs demo viewer https://mozilla.github.io/pdf.js/web/viewer.html.
Annotation correctly displayed in pdfs demo viewer:
Here is now it is displayed in my app using Chrome:
Here is how it is displayed I Safari using my app:
This is now I initialise the pdfs viewer:
function initPdfjs() {
// Enable hyperlinks within PDF files.
pdfLinkService = new (pdfjsViewer as any).PDFLinkService({
eventBus,
});
// Enable find controller.
pdfFindController = new (pdfjsViewer as any).PDFFindController({
eventBus,
linkService: pdfLinkService,
});
const container = document.getElementById('viewerContainer');
if (container) {
// Initialize PDFViewer
pdfViewer = new (pdfjsViewer as any).PDFViewer({
eventBus,
container,
removePageBorders: true,
linkService: pdfLinkService,
findController: pdfFindController,
});
// pdfViewer.textLayerMode = Utils.enableTextSelection() ? TextLayerMode.ENABLE : TextLayerMode.DISABLE;
pdfViewer.textLayerMode = TextLayerMode.ENABLE_ENHANCE;
// See https://github.com/mozilla/pdf.js/issues/11245
if (Utils.isIos()) {
pdfViewer.maxCanvasPixels = 4000 * 4000;
}
pdfLinkService.setViewer(pdfViewer);
return;
} else {
console.error(`getElementById('viewerContainer') failed`);
}
}
What do I need to do in order to get the annotations to display correctly in my app?

Answer 1

I got it working. I don't know if it is the right way, but I post it in case somebody can use it.
First I setup webpack to copy the content from ./node_modules/pdfjs-dist/web/images to my dist folder so the images got included. That solved all the display errors except {{date}}, {{time}}.
new CopyPlugin({
patterns: [
{ from: './node_modules/pdfjs-dist/web/images', to: '' },
{ from: './l10n', to: 'l10n' },
],
}),
To solve the {{date}}, {{time}} problem I set up a localisation service. I did that by copying the file ng2-pdfjs-viewer-master/pdfjs/web/locale/en-US/viewer.properties to ./l10n/local.properties in my project. Then it is copied to the dist folder by above webpack plugin. I then setup the l10n service in my pdfjs by adding this code:
// initialize localization service, so time stamp in embedded comments are shown correctly
l10n = new (pdfjsViewer as any).GenericL10n('en-US');
const dir = await l10n.getDirection();
document.getElementsByTagName('html')[0].dir = dir;
and added l10n to PDFViewer initialisation:
// Initialize PDFViewer
pdfViewer = new (pdfjsViewer as any).PDFViewer({
eventBus,
container,
removePageBorders: true,
linkService: pdfLinkService,
findController: pdfFindController,
l10n,
});
And now annotations is shown correctly:
What I find a bit weird is the date format. I used en-US as locale, so I would expect it to be mm/dd/yyyy (American way), but it is dd/mm/yyyy (like a dane would prefer it). I have tried to fool around with the date settings on my Mac and language settings in Chrome, but it doesn't look like it has any effect, so I don't know what to do if an American customer complains.