NaN in thumbnail display

[camdendotlol]

Hello,

I've set up a Mirador 3 site and, while everything else works fine, I'm seeing these NaN labels on the thumbnails.

I'm assuming it's an issue with our manifest, like a missing or invalid field. Looking through the Mirador code, I can't find where specifically it's looking for this label. Which data field does Mirador source these labels from?

[northcoder-repo]

I just encountered this issue. Here is how I resolved it, using IIIF presentation API v3.0:

I added the following label section to my items list, where "type": "Canvas":

"label": {
    "en": [
        "foo"
    ]
},

Now I see foo in the thumbnail, instead of NaN ("not a number").

(This was just for a single image. I would repeat this for multiple images, as needed. Haven't got to that step yet. I am new to IIIF, so there is always the chance that there is a better approach I am not aware of.)

---

If you are using version 2 of the presentation spec, I think the solution is completely different - relating to sequences labels.

[enriquediaz]

@camdendotlol would you be able to provide a copy of a manifest where you're seeing this occur?

While I think @northcoder-repo has indeed come up with a solution that highlights a bug in Mirador where it attempts to construct a label when no label is given (credit to @lutzhelm for spotting where in the code this is occurring), it's also possible the manifest design can also be contributing to this.

[camdendotlol]

When I get back to work on Monday I can try to find the manifests we used for that project but I'll have to ask around a bit to see if it's alright for me to share one of the manifests here.

I do remember that we fixed the issue by adding labels like northcoder-repo did.

[enriquediaz]

In that case I'll close this and if we do come across an issue again, we'll hopefully be able to respond more quickly!