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<p><font face="Helvetica, Arial, sans-serif">Hi Andreas,</font></p>
<p><font face="Helvetica, Arial, sans-serif">I wrote a little
example app [1] to show the error. It seems that the error is
gone in OpenLayers v4.4.2. If you want to see how it behaved
before have a look at my example, which uses OL v 4.3.4.</font></p>
<p><font face="Helvetica, Arial, sans-serif">Cheers<br>
Chris<br>
</font></p>
<p><font face="Helvetica, Arial, sans-serif">[1]
<a class="moz-txt-link-freetext" href="https://apps.meggsimum.de/ol-vt-issue/">https://apps.meggsimum.de/ol-vt-issue/</a></font><br>
</p>
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<div class="moz-cite-prefix">On 19.10.2017 17:17, Andreas Hocevar
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOiJ94h0iSZH0XfAEaR-OhsaF0yJZLThqGnj1s8ujspi95y6AA@mail.gmail.com">
<pre wrap="">Hey Chris,
this sounds like a bug. Can you please create a ticket and provide a
codepen that shows the issue?
Thanks,
Andreas.
On Thu, Oct 19, 2017 at 5:11 PM, Christian Mayer <a class="moz-txt-link-rfc2396E" href="mailto:ml-cm@meggsimum.de"><ml-cm@meggsimum.de></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi OL-Devs,
I have a setup with a VectorTile layer based on Mapbox Vector Tiles (created
with GeoServer / Geowebcache). To save time at transferring the pbf-files to
the target environment all empty pbf-files were deleted. This results in
HTTP 404s (of course) when OpenLayers tries to load the missing tiles.
I expected that this won't bring any problems and that OL is just ignoring
them. But unfortunately a JS-exception occurs if in the current map-exent is
one of the missing tiles.
It seems that the "tileProjection" is undefined for the given "sourceTile",
so the operation tileProjection.getUnits() fails, see here [1]. So it seems
that the missing tile is not ignored in the code and due to the lack of
information the rendering process fails.
If I add an emtpy pbf-file, so no HTTP 404 occurs anymore, the exception is
gone. Even though no more information is provided (from my humble point of
view).
So here are some questions: Can someone confirm this behavior? Is this
wanted behavior for some reasons? Or is this even a bug or an edge case?
I am using OpenLayers v4.3.4.
Thanks in advance for any hint / help / clarification.
Cheers
Chris
[1]
<a class="moz-txt-link-freetext" href="https://github.com/openlayers/openlayers/blob/v4.3.4/src/ol/renderer/canvas/vectortilelayer.js#L139">https://github.com/openlayers/openlayers/blob/v4.3.4/src/ol/renderer/canvas/vectortilelayer.js#L139</a>
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</pre>
</blockquote>
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