Changes between Version 59 and Version 60 of FrequentlyAskedQuestions

Timestamp:

05/15/08 02:37:19 (5 years ago)

Author:

openlayers

Comment:

Added "Markers" section, and question about markers not showing at all zoom levels

FrequentlyAskedQuestions

@@ -369 +369 @@
 right location, or your webserver is not configured correctly.
 
-
-
-[wiki:FrequentlyAskedQuestions# Back to Top]
-----
-[[BR]]
-= Misc =
-
-== How do I set up !OpenLayers to run with !TileCache? ==
-
-The !TileCache distribution includes an HTML example, index.html, which shows how to use it with OpenLayers. Assuming that your bbox and resolutions array are the defaults, it should be really simple -- when they're not anymore, things get a bit more difficult.
+[wiki:FrequentlyAskedQuestions# Back to Top]
+----
+
+= Markers =
 
 == Why is My Map Sluggish when I Add 500 Markers? ==
@@ -385 +379 @@
 yourself to under 500 markers (Firefox) or 50 markers (IE6).
 
-== How Do I Build a Single-File Version of !OpenLayers? ==
-
-See [wiki:Profiles]
-
+== Why don't my markers appear at certain zoom levels? ==
+
+The problem is that your markers layer is considered 'out of range' for some reason. The source of the problem is probably to do with the "resolutions" setting on the base layer. One fix is to override the calculateInRange function to always return true, eg:
+
+{{{
+//Original
+Markers = new OpenLayers.Layer.Markers("Markers");
+
+//override the calculateInRange function to always return true
+Markers = new OpenLayers.Layer.Markers("Markers", {'calculateInRange': function() { return true; }});
+}}}
+
+Also see [http://www.nabble.com/Marker-Disappearing-to11325890.html#a11325890 this mailing list thread], particularly [http://www.nabble.com/Re%3A-Marker-Disappearing-p11326684.html this post]
 
 [wiki:FrequentlyAskedQuestions# Back to Top]
@@ -432 +435 @@
 
 * If you have different or more complete (browser-specific, precise figures, etc.) data, please insert it here!
+
+[wiki:FrequentlyAskedQuestions# Back to Top]
+
+----
+= Misc =
+
+== How do I set up !OpenLayers to run with !TileCache? ==
+
+The !TileCache distribution includes an HTML example, index.html, which shows how to use it with OpenLayers. Assuming that your bbox and resolutions array are the defaults, it should be really simple -- when they're not anymore, things get a bit more difficult.
+
+== How Do I Build a Single-File Version of !OpenLayers? ==
+
+See [wiki:Profiles]