daattali/shinyscreenshot

"resolved is undefined" error with screenshotButton in shinylive

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#29 opened on Jan 4, 2024

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help wanted

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Description

I've been asked to get a shiny app running on shinylive (in-browser running of shiny apps via webr) and I get this error image:

image

unless I comment out the screenshotButton call in the ui section, in which case the app works fine in the browser.

I can only guess this is because of the way browser screenshot code works, and its beyond me to debug it at this time. My main motivation for reporting it here is so if anyone searches for "shinylive resolved is undefined" they can see this and it will save them a bunch of debugging to discover the issue is with screenshotButton.

Contributor guide

Research direction
Investigate the 'resolved is undefined' JavaScript error when using screenshotButton in shinylive. Focus on the implementation of screenshotButton's JavaScript callback and its compatibility with webR and the shinylive environment. Check for missing or improperly handled Promise resolution.
Tech stack
r
Domain
full stack
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
RShiny
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50