Could not retrieve signature

tifcollect · December 1, 2021, 8:54am

Hello there!
We have developed a form that containing a signature.
When checking the data received, many forms contain the error message: “Could not retrieve signature” next to the signature. while other forms signature’s image appear normally.
Any idea why it does so ? Any remedies before sending back the form to be filled again ?

Kal_Lam · December 1, 2021, 11:11am

Welcome to the community, @tifcollect! Could you share a screenshot of the issue so that we could understand your issue pictorially?

tifcollect · December 1, 2021, 11:16am

Thank you!
I’ve attached a screenshot. I want to know if the problem is from the form itself, the connection, or from the browser or device of the individual filling it.
Thanks again.

Kal_Lam · December 2, 2021, 5:31am

@tifcollect, we have a GitHub issue for this which you should be able to follow here:

github.com/enketo/enketo-express

Data loss: not all signature images are uploaded in offline-capable forms

opened 07:44PM - 18 Oct 21 UTC

p2edwards

bug

**Description** This is an intermittent bug that results in a loss of signatu…re images. If a form includes multiple image questions, at least one of which is `appearance: signature`, and the form is running in offline mode, it is likely that one or more of the signature image files get lost in the submission process. **To Reproduce**  When running a form like this in offline mode: type | name | label | appearance -- | -- | -- | -- start | start | | end | end | | image | sign_now | sign now! | signature image | sign_again | sign again! | signature The first or second signature image is likely to be missing, for each submission. other factors: - must use offline version of form to reproduce bug - happens on 2.5.6 and 2.8.1 (about to test on 3.0.1) - tried to sign both fields as quickly as possible - having a non-signature appearance image in the form can also "crowd out" the signature file but regular images do not crowd each other out based on our testing so far. **Expected behavior** Desired behavior is that no attachments are missing upon submission. **Browser and OS** - OS: Issue has been reproduced on macos and Linux. - Browser: Issue has been reproduced in Chrome and Safari. **Additional context** I'm looking into this now, so I can add screenshots or improved description soon.

steen_andersen · June 7, 2022, 10:31am

I have read issue 373
It seems the loss off signature happens if the time from adding the signature and clicking the submit button is to short (500 ms). (when working offline)
I have tested our survey where I have now added an extra group with a check question AFTER the signature.
It seems both signatures are now saved and uploaded to Kobo.

Kal_Lam · June 9, 2022, 8:24am

@steen_andersen,