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<title>FW: Remove layers at runtime</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Trevor,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I think I found a big hint after testing
what you suggested. When the layers I’m trying to remove are within the map
view extent, they do not ‘disappear’ upon removing them. However,
If the layers are completely outside the map view extent they indeed get
removed with the same code. It doesn’t matter if it’s one layer or
multiples. Hopefully this gives you something to work with. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Shane<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Trevor
Wekel [mailto:trevor.wekel@autodesk.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 15, 2007
11:18 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Buscher, Shane;
Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Hi Shane,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>My bad. I've been
working with the Mapguide 1.1.x and trunk branches. You are working on
the released 1.0.x branch. Sorry for the confusion. 1.0.x does not
have the boolean return.</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Is there any difference
if you try to remove only one layer so there are still layers on the map?</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Thanks,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Trevor</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Buscher,
Shane [mailto:Shane.Buscher@nngco.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, January 13, 2007
1:31 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Trevor Wekel; Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
<div id=idOWAReplyText61961>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black'>Trevor,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>MgLayerCollection.Remove doesn't
return a boolean according to the api documentation, and also doesn't indicate
it in the intellisense. </span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Regards,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Shane</span></font><o:p></o:p></p>
</div>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Trevor
Wekel [mailto:trevor.wekel@autodesk.com]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri 1/12/2007 5:18 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Buscher, Shane;
Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Hi Shane,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Remove() should returns a
boolean true or false. false indicates that the layer was not
removed. Can you see if the remove was successful? (just trying to debug
a bit)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Thanks,<br>
Trevor</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Buscher,
Shane [mailto:Shane.Buscher@nngco.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 12, 2007
4:13 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Trevor Wekel; Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Trevor,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks for the
response. I think I’m doing everything you suggested correctly, but
have provided the snippets below. When the page loads the
ConnectToMapGuide() method gets called, which opens up the MgMap and sets it to
a module level variable (map). Then, Button1 is clicked which
successfully adds two layers to the map. When Button2 gets invoked, I try
to remove the layers but the layers still persist in the map. </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>I’m not sure where
to go from here. Do you need to copy the layers in session, then add them
from there in order to have the ability to remove them? Just
reaching…</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Shane</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'>‘class vars</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Private</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> resourceService <font
color=blue><span style='color:blue'>As</span></font> MgResourceService</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Private</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> map <font color=blue><span
style='color:blue'>As</span></font> MgMap</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Private</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font> ConnectToMapGuide()</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'Connect to MapGuide site</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> userInfo <font
color=blue><span style='color:blue'>As</span></font> <font color=blue><span
style='color:blue'>New</span></font> MgUserInformation(Session.Item(<font
color=maroon><span style='color:maroon'>"mgSessionId"</span></font>))</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> siteConn <font
color=blue><span style='color:blue'>As</span></font> <font color=blue><span
style='color:blue'>New</span></font> MgSiteConnection</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
siteConn.Open(userInfo)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'set resource service</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
resourceService = siteConn.CreateService(MgServiceType.ResourceService)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'Open map</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map = <font color=blue><span style='color:blue'>New</span></font> MgMap</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.Open(resourceService, Session.Item(<font color=maroon><span
style='color:maroon'>"mgMapName"</span></font>))</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>End</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Protected</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font> Button1_Click(<font color=blue><span
style='color:blue'>ByVal</span></font> sender <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>Object</span></font>,
<font color=blue><span style='color:blue'>ByVal</span></font> e <font
color=blue><span style='color:blue'>As</span></font> System.EventArgs) <font
color=blue><span style='color:blue'>Handles</span></font> Button1.Click</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>‘add dwf layer</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=blue face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> schematicId <font
color=blue><span style='color:blue'>As</span></font> <font color=blue><span
style='color:blue'>New</span></font>MgResourceIdentifier _
</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:.5in'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>(<font
color=maroon><span style='color:maroon'>"Library://VST/Layers/SouthOmahaTeamSchematic.LayerDefinition"</span></font>)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> schematic <font
color=blue><span style='color:blue'>As</span></font> MgLayer =
CreateLayer(schematicId, <font color=blue><span style='color:blue'>False</span></font>)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.GetLayers.Insert(index, schematic)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>‘add sdf layer</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> valveId <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>New</span></font>
MgResourceIdentifier _ </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in;text-indent:.5in'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>(<font
color=maroon><span style='color:maroon'>"Library://VST/Layers/SouthOmahaValves.LayerDefinition"</span></font>)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> valves <font
color=blue><span style='color:blue'>As</span></font> MgLayer =
CreateLayer(valveId, <font color=blue><span style='color:blue'>True</span></font>)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.GetLayers.Insert(index, valves)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.Save(resourceService)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'emit javascript to refresh map</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>End</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Protected</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font> Button2_Click(<font color=blue><span
style='color:blue'>ByVal</span></font> sender <font color=blue><span
style='color:blue'>As</span></font> <font color=blue><span style='color:blue'>Object</span></font>,
<font color=blue><span style='color:blue'>ByVal</span></font> e <font
color=blue><span style='color:blue'>As</span></font> System.EventArgs) <font
color=blue><span style='color:blue'>Handles</span></font> Button2.Click</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> lyr0 <font
color=blue><span style='color:blue'>As</span></font> MgLayer =
map.GetLayers.GetItem(0)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>Dim</span></font> lyr1 <font
color=blue><span style='color:blue'>As</span></font> MgLayer =
map.GetLayers.GetItem(1)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.GetLayers.Remove(lyr0)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.GetLayers.Remove(lyr1)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
map.Save(resourceService)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=green><span style='color:green'>'emit javascript to refresh map</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>End</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> <font color=blue><span
style='color:blue'>Sub</span></font></span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='margin-left:1.0in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Trevor
Wekel [mailto:trevor.wekel@autodesk.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 12, 2007
3:37 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Buscher, Shane;
Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>Hi
Shane,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>This
should work. During your setup, are you calling MgMap.Open() or
MgMap.Create()? The MgMap.Open() should set up the resource identifier
correctly so that Save() will have the map to the correct session repository.</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>Is the
session id being propagated correctly? If you can do the following and
the layer appears in the viewer then the session should be ok.</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.Open()</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.GetLayers().Insert(layer)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.Save()</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>If the
Insert() works and Remove() doesn't</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.Open()</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.GetLayers().Remove(layer)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>MgMap.Save()</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>Then
this is probably a bug. Also, does the behaviour depend on the number
remaining layers?</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>Thanks,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>Trevor</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div style='margin-left:.5in'>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:1.0in'><b><font size=2 face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Buscher,
Shane [mailto:Shane.Buscher@nngco.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, January 12, 2007
7:16 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Buscher, Shane;
Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>I
haven’t got any feedback yet, but I have been trying desperately to make
this work. To recap, I’m finding that adding a layer to a map at
runtime with MgLayerCollection.Add works fine. However, when I try to
remove layer(s) with MgLayerCollection.Clear, MgLayerCollection.Remove, or
MgLayerCollection.RemoveAt the layer(s) are indeed removed from the collection-
but <i><span style='font-style:italic'>not the map</span></i>. I am
saving the map and refreshing the map after removal. </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>So why
does inserting a layer into the MgMapCollection work, but removing not?
Looking at the developers guide on page 56 there is a note for getting a layer
collection from the map (MgMap.GetLayers): </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><i><font size=1 face=StoneSans><span
style='font-size:9.0pt;font-family:StoneSans;font-style:italic'>In the MapGuide
API, getting a collection returns a reference to the collection. So adding the
layer to the layer collection immediately updates the map.</span></font></i><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>I am get
the impression that adding a layer to the collection automatically updates the
map, this doesn’t apply for removing a layer. I can’t figure
out what I need to do to mimic what the api does for you when inserting a layer
when trying to remove a layer. Or is this a bug?</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks
for any help in advance. </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Regards,</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Shane</span></font><o:p></o:p></p>
<div>
<div style='margin-left:.5in'>
<div style='margin-left:.5in'>
<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
</div>
</div>
<p class=MsoNormal style='margin-left:1.5in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
mapguide_users-bounces@lists.osgeo.org [mailto:mapguide_users-bounces@lists.osgeo.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Buscher, Shane<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, January 09, 2007
4:49 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Mapguide_users@lists.osgeo.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Mapguide_users] FW:
Remove layers at runtime</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:1.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>I’ve run into issues with removing all layers
from the map at runtime. See the code snippet below. All the layers
get removed from the layerCollection, but the layers still display.
I’ve successfully used the same code to insert layers, except I execute
the</span></font> <font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>layerCollection.Insert(index, layer) method. I
don’t know why the same code wouldn’t work for clearing
layers. </span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>I have multiple layers
stored in a library repository that users need to add and remove at
runtime. Do I need to copy each layer in indvidual session repositories
to add and reomove them? If I don’t, will one user adding/removing
layers affect other user sessions? I know this is the case when you edit
data, but these layers are view only. </span></font> <o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>‘</span></font><font size=2 color=green
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:green'>Connect to site server, set resource service, and open map</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>ConnectToMapGuide() </span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=green face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:green'>'Clear all layers
in the map</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>Dim</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
layerCollection</span></font> <font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>As</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
MgLayerCollection = map.GetLayers()</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>If</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
layerCollection.GetCount > 0</span></font> <font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>Then</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
layerCollection.Clear()</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>End</span></font>
<font size=2 color=blue face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>If</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>map.Save(resourceService)</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=green face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:green'>'emit javascript
to refresh map</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>Dim</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
scriptKey</span></font> <font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>As</span></font> <font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>String</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> =</span></font> <font
size=2 color=maroon face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:maroon'>"ForceRefresh"</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>If</span></font> <font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>Not</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> Page.ClientScript.IsStartupScriptRegistered(<font
color=blue><span style='color:blue'>Me</span></font>.GetType, scriptKey)</span></font>
<font size=2 color=blue face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>Then</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> </span></font> <font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>Dim</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> javaScript</span></font> <font
size=2 color=blue face="Courier New"><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>As</span></font> <font size=2 color=blue
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>String</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> =</span></font> <font
size=2 color=maroon face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:maroon'>"refreshMap("</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
& MapAction.RefreshMap &</span></font> <font size=2 color=maroon
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:maroon'>");"</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
Page.ClientScript.RegisterStartupScript(<font color=blue><span
style='color:blue'>Me</span></font>.GetType, scriptKey, javaScript,</span></font>
<font size=2 color=blue face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>True</span></font><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>)</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>End</span></font>
<font size=2 color=blue face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>If</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><a name=""><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Regards,</span></font></a><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Shane</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray'>Operations IT</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray'>Northern Natural Gas</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray'>402.398.7841</span></font><o:p></o:p></p>
<p style='margin-left:1.5in'><i><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-style:italic'>We
think in generalities, but live in detail. </span></font></i><o:p></o:p></p>
<p style='margin-left:1.5in'><i><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-style:italic'>-Alred
North Whitehead</span></font></i><o:p></o:p></p>
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