Ngx-extended-pdf-viewer: Expected print service to be initialized

[i7i5]

Describe the bug
If you use ngIf to hide and show the viewer pressing print button in between, the first printing works. All following print attempts wont work anymore. The error in console is: Expected print service to be initialized.

Version info

• 7.0.0

Desktop (please complete the following information):

• latest Firefox 83
• latest Chrome 87.0.4280.88

To Reproduce
In production we display the pdf viewer if some resource returns a pdf as base64 and we hide it after printing and if no pdf is loaded. The main principle can be retraced with the following example project: https://github.com/i7i5/pdf-example

• click the button so the pdf will show up
• press the print button
• eighter print or cancel
• click the button again
• press the print button again

The print prompt wont show up again and in console you get the following error:

Expected print service to be initialized. 2 viewer-2.6.418.min.js:43:234879
    printPDF http://localhost:4200/assets/viewer-2.6.418.min.js:43
    webViewerPrint http://localhost:4200/assets/viewer-2.6.418.min.js:43
    dispatch http://localhost:4200/assets/viewer-2.6.418.min.js:43
    dispatch http://localhost:4200/assets/viewer-2.6.418.min.js:43
    _bindListeners http://localhost:4200/assets/viewer-2.6.418.min.js:43
    invokeTask http://localhost:4200/polyfills.js:9563
    runTask http://localhost:4200/polyfills.js:9331
    invokeTask http://localhost:4200/polyfills.js:9644
    invokeTask http://localhost:4200/polyfills.js:10785
    globalZoneAwareCallback http://localhost:4200/polyfills.js:10811
    (Async: EventListener.handleEvent)
    customScheduleGlobal http://localhost:4200/polyfills.js:10937
    scheduleTask http://localhost:4200/polyfills.js:9549
    scheduleTask http://localhost:4200/polyfills.js:9374
    scheduleEventTask http://localhost:4200/polyfills.js:9400
    makeAddListener http://localhost:4200/polyfills.js:11092
    _bindListeners http://localhost:4200/assets/viewer-2.6.418.min.js:43
    Toolbar http://localhost:4200/assets/viewer-2.6.418.min.js:43
    _initializeViewerComponents http://localhost:4200/assets/viewer-2.6.418.min.js:43
    initialize http://localhost:4200/assets/viewer-2.6.418.min.js:43
    run http://localhost:4200/assets/viewer-2.6.418.min.js:43
    webViewerLoad http://localhost:4200/assets/viewer-2.6.418.min.js:43
    doInitPDFViewer http://localhost:4200/vendor.js:13287
    invokeTask http://localhost:4200/polyfills.js:9563
    onInvokeTask http://localhost:4200/vendor.js:53839
    invokeTask http://localhost:4200/polyfills.js:9562
    runTask http://localhost:4200/polyfills.js:9331
    invokeTask http://localhost:4200/polyfills.js:9644
    invoke http://localhost:4200/polyfills.js:9633
    timer http://localhost:4200/polyfills.js:11716
    (Async: setTimeout handler)
    scheduleTask http://localhost:4200/polyfills.js:11737
    scheduleTask http://localhost:4200/polyfills.js:9549
    onScheduleTask http://localhost:4200/polyfills.js:9436
    scheduleTask http://localhost:4200/polyfills.js:9542
    scheduleTask http://localhost:4200/polyfills.js:9374
    scheduleMacroTask http://localhost:4200/polyfills.js:9397
    scheduleMacroTaskWithCurrentZone http://localhost:4200/polyfills.js:10298
    setNative http://localhost:4200/polyfills.js:11750
    name http://localhost:4200/polyfills.js:10613
    doInitPDFViewer http://localhost:4200/vendor.js:13270
    ngAfterViewInit http://localhost:4200/vendor.js:13075
    callHook http://localhost:4200/vendor.js:28065
    callHooks http://localhost:4200/vendor.js:28035
    executeInitAndCheckHooks http://localhost:4200/vendor.js:27987
    refreshView http://localhost:4200/vendor.js:34826
    refreshEmbeddedViews http://localhost:4200/vendor.js:35862
    refreshView http://localhost:4200/vendor.js:34779
    refreshComponent http://localhost:4200/vendor.js:35908
    refreshChildComponents http://localhost:4200/vendor.js:34552
    refreshView http://localhost:4200/vendor.js:34805
    renderComponentOrTemplate http://localhost:4200/vendor.js:34869
    tickRootContext http://localhost:4200/vendor.js:36082
    detectChangesInRootView http://localhost:4200/vendor.js:36107
    detectChanges http://localhost:4200/vendor.js:48112
    tick http://localhost:4200/vendor.js:54765
    next http://localhost:4200/vendor.js:54654
    invoke http://localhost:4200/polyfills.js:9528
    onInvoke http://localhost:4200/vendor.js:53851
    invoke http://localhost:4200/polyfills.js:9527
    run http://localhost:4200/polyfills.js:9287

I also tried this example with the bleeding edge trigger on (see bleeding-edge branch) but with the newest pdfjs version the afterPrint output doesnt work correctly. I am also not sure if its a bug of this lib or of the pdfjs lib. If its on pdfjs side how to report it to them?

I hope this report helps to find the bug.

BR

[stephanrauh]

Hey, cool, you've send not only one, but two reproducers! Thanks a lot!

As for the bleeding edge branch: I've started to merge the latest changes from pdf.js manually, and that's always an error-prone process. So I assume it's my bug.

This week I'm very busy, so I can't promise you to solve the bug soon.

[stephanrauh]

The bugfix has landed with version 7.1.0.

Enjoy!
Stephan

[i7i5]

Thank you a lot, works like a charm :)

I wish you a nice third advent!
i7