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<p><font face="Helvetica, Arial, sans-serif">Hi again,<br>
</font></p>
<p><font face="Helvetica, Arial, sans-serif">here is some more
information in addition to my previous mail:</font></p>
<p><font face="Helvetica, Arial, sans-serif">The problem occurs for
VectorTiles in GeoJSON format as well. So there must be a more
general problem with extending the </font><br>
<font face="Helvetica, Arial, sans-serif">ol.source.VectorTile (or
the way I do it).<br>
The change / problem seems to be introduced with Version 4.2.0.
With version 4.1.1 everything works as expected.</font></p>
<p><font face="Helvetica, Arial, sans-serif">Cheers<br>
Chris<br>
</font></p>
<p><font face="Helvetica, Arial, sans-serif"></font><br>
</p>
<div class="moz-cite-prefix">On 12.10.2017 13:45, Christian Mayer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:860f0d80-51a2-9f6b-aa43-a96dd0c9ba5e@meggsimum.de">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<p><font face="Helvetica, Arial, sans-serif">Hi all,</font></p>
<p>I extended the class ol.source.VectorTile in order to load
VectorTiles in different formats (GeoJSON and MVT) from a local
GWC cache. While upgrading from OpenLayers v3.20 to OpenLayers
v4.x it seems that for MVT the scope in the "tileUrlFunction"
gets lost. It seems to be "window". For GeoJSON-based
VectorTiles everything is still running fine.</p>
<p>Below you find the crutial parts of my class:</p>
<p><tt>ol.inherits(ol.source.GWCVT, ol.source.VectorTile);</tt><tt><br>
</tt><tt><br>
</tt><tt>ol.source.GWCVT.prototype.tileUrlFunction =</tt><tt><br>
</tt><tt> function(tileCoord, pixelRatio, projection) {</tt></p>
<p><tt>// here 'this' becomes 'window' in the second call<br>
</tt></p>
<p><tt>// assembling the URL</tt><tt><br>
</tt><tt>// ...</tt><tt><br>
</tt></p>
<p><tt>}</tt></p>
<p><tt>ol.source.GWCVT.prototype.setTileUrlFunction =
function(tileUrlFunction) {</tt><tt><br>
</tt><tt><br>
</tt><tt>
ol.source.VectorTile.prototype.setTileUrlFunction.call(this,
tileUrlFunction);</tt><tt><br>
</tt><tt>};</tt></p>
<p>Thanks for any hint!</p>
Cheers<br>
Chris <br>
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