[mapguide-trac] #214: Ajax Viewer hangs when loading maps with tiled base layer groups in IE6

[MapGuide Open Source]

#214: Ajax Viewer hangs when loading maps with tiled base layer groups in IE6
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   Reporter:  wct          |       Owner:                
       Type:  defect       |      Status:  new           
   Priority:  medium       |   Milestone:  1.2           
  Component:  AJAX Viewer  |     Version:  1.2.0         
   Severity:  major        |    Keywords:  Tiled Maps IE6
External_id:               |  
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 I'm having an issue with the 1.2.0 RC1 release when using the AJAX viewer
 with a map that contains a base layer group. I have a map with a single
 base layer group containing 10 layers. When rendering the map, IE6 hangs
 up while pulling down the base layer group tiles from the server. The same
 map renders correctly when using IE7 or FireFox. If I use a HTTP capture I
 can see the browser issues:

 GET
 /mapguide/mapagent/mapagent.fcgi?OPERATION=GETTILEIMAGE&VERSION=1.2.0&SESSION=
 66bc0a1a-0000-1000-8000-
 0003ffcc28b3_en_0A0032280AFC0AFB0AFA&MAPDEFINITION=Library%3A%2F%2FWCT%2FARC%2FARC_PipeWatch.MapDefinition&BASEMAPLAYERGROUPNAME=Base%20Data%20_PRE&TILECOL=19101&TILEROW=7472&SCALEINDEX=0
 HTTP/1.1

 GET
 /mapguide/mapagent/mapagent.fcgi?OPERATION=GETTILEIMAGE&VERSION=1.2.0&SESSION=
 66bc0a1a-0000-1000-8000-
 0003ffcc28b3_en_0A0032280AFC0AFB0AFA&MAPDEFINITION=Library%3A%2F%2FWCT%2FARC%2FARC_PipeWatch.MapDefinition&BASEMAPLAYERGROUPNAME=Base%20Data%20_PRE&TILECOL=19101&TILEROW=7473&SCALEINDEX=0
 HTTP/1.1

 GET
 /mapguide/mapagent/mapagent.fcgi?OPERATION=GETTILEIMAGE&VERSION=1.2.0&SESSION=
 66bc0a1a-0000-1000-8000-
 0003ffcc28b3_en_0A0032280AFC0AFB0AFA&MAPDEFINITION=Library%3A%2F%2FWCT%2FARC%2FARC_PipeWatch.MapDefinition&BASEMAPLAYERGROUPNAME=Base%20Data%20_PRE&TILECOL=19101&TILEROW=7474&SCALEINDEX=0
 HTTP/1.1

 But then stalls (5+ minutes). If I pull these URL's individually on their
 own, the server returns imagery very quickly (so I believe the problem is
 in the javascript on the client). I've been able to reproduce this on
 several machines running IE6.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/214>
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