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<title>Viewer API Selection Timing Issues</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'>Walt,<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'>Thanks for your solution. Here’s
essentially what I had to do to get my app to work. The fundamental
difference between your example (very helpful) and mine is that I’m
selecting with SetSelectionXML viewer api function, while you were having the
user manually select a feature and storing it in memory. Thanks
again. <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 style='text-indent:.5in;text-autospace:none'><font size=2
color=blue face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>var</span></font><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> xmlSelection<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>function</span></font>
pauseForMap(xmlSel, x, y) <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
{ <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
xmlSelection = xmlSel<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
parent.parent.ZoomToView(x, y, 15, <font color=blue><span style='color:blue'>true</span></font>);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
setTimeout(<span style='background:white'>"select()"</span>, 0);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
}<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=blue><span style='color:blue'>function</span></font> select()<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
{<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
parent.parent.mapFrame.emapViewer.WaitForMapUpdated();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
parent.parent.SetSelectionXML(xmlSelection);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'> }</span></font><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'><o:p> </o:p></span></font></p>
<div>
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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='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'> mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Walt Welton-Lair<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, March 16, 2007 9:17
PM<br>
<b><span style='font-weight:bold'>To:</span></b> MapGuide Users Mail List<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users]
Viewer API Selection Timing Issues</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'>Ok, I debugged into this
a little and learned something. Here's the test I did:</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>selected
a feature and stored the selection XML (using SerializeSet)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>cleared
the selection and panned the view until the feature was no longer visible</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>called
the following code:</span></font><o:p></o:p></p>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<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'>EMapViewer.ZoomToView(centerX,
centerY, scale);</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'>EMapViewer.Refresh();</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'>EMapViewer.WaitForMapUpdated();</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'>EMapViewer.SelectionSet =
EMapViewer.DeserializeSet(selectionXML);</span></font><o:p></o:p></p>
</div>
</blockquote>
</blockquote>
<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'>The view was correctly
updated, but, like you, nothing got selected.</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 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>I then looked at the
viewer code, and here's what happens:</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>we call
Refresh, which posts a message to the message queue</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=blue
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>the
handler for that message initiates the refresh, and also sets the variable used
by WaitForMapUpdated</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'>So what I think goes
wrong for us is that we call Refresh - which posts the message - and then
straight afterwards we call WaitForMapUpdated - but the message has not
yet been processed and so WaitForMapUpdated returns right away.</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 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>I modified my code to
pause slightly after the call to Refresh using setWindow, and then it
worked. In fact, it worked even when I set the delay to 0 ms.
I think that's because setWindow is asynchronous, and so right after it's
called Windows can get back to processing messages in the queue.</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 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>I also did a test where I
ran a loop after the call to Refresh to simulate a delay, but that
didn't work.</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 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Anyway, I've attached a
zip containing my test. You can try it out yourself - just modify the
LoadMap method to point to your server. Once the map loads, zoom in and
select a feature and click on "Capture Selection". Then
deselect it, adjust the view so the feature is no longer visible, and click on
"Restore Selection".</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 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Walt</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>
<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'>
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> Friday, March 16, 2007 6:32
PM<br>
<b><span style='font-weight:bold'>To:</span></b> MapGuide Users Mail List<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users]
Viewer API Selection Timing Issues</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'>Walt,<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'><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 having any
success with the WaitForMapUpdated function. There’s several steps
I’ve taken in my qwest to get this working:<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'>
<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'>Here’s the original
problem. When I do this on the client, passing in the correct variables, the
DWF viewer zooms to the point but does not highlight it.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>ZoomToView(x, y, scale, true);<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'>
SetSelectionXML(xmlSet);<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'><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'>If I pause after the
zoom, the selected feature successfully highlights. For instance, the
time it takes to close a window after zooming will result in a highlight:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>ZoomToView(x, y, scale, true);<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Alert(‘pausing’);<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'>
SetSelectionXML(xmlSet);<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'><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'>So I tried several
combinations of both the WaitForMapUpdated and the Busy property. I was
never successful at obtaining a ‘busy’ state for the map. I
think that this means WaitForMapUpdated doesn’t include map
refreshes. I was successful at getting a non-busy state of the map with
the Busy property, making sure that my javascript code was executing
correctly. <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'>
ZoomToView(x, y, scale, true);<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'>
WaitForMapUpdated();<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'>
SetSelectionXML(xmlSet);<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'>
<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'>
ZoomToView(x, y, scale, true);<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'>
</span></font><font size=2 color=blue face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>while</span></font><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
(parent.parent.mapFrame.emapViewer.DocumentHandler.Busy==<font color=blue><span
style='color:blue'>true</span></font>) {<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'> </span></font><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>parent.parent.mapFrame.emapViewer.DocumentHandler.WaitForMapUpdated();<font
color=green><span style='color:green'><o:p></o:p></span></font></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"'>
}</span></font><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 style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>
SetSelectionXML(xmlSet);<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'><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'>So now I am really
stuck. My only option that I can see is to put some predetermined pause
between the ZoomToView and SetSelectionXML methods. This isn’t a
good solution, but my only other alternative is to switch over to the <st1:place
w:st="on"><st1:City w:st="on">AJAX</st1:City></st1:place> viewer.
That’s doable, but not preferred. Is there anything else you can
think of doing? Given that this problem makes it impossible to zoom to a
selected feature that’s not in the viewer map extent, would this be
considered functionality that needs to be supported by the DWF Viewer?<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'><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,<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'><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<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'><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'><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'><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'><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'><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'><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='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'>
mapguide-users-bounces@lists.osgeo.org [mailto:mapguide-users-bounces@lists.osgeo.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Walt Welton-Lair<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, March 15, 2007
10:12 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">MapGuide
Users Mail List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users]
Viewer API Selection Timing Issues</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'>You're
using DWF Viewer right?</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'>With DWF
Viewer there's a WaitForMapUpdated API you can call on the EMapViewer
document handler. That method is precisely there to solve your kind of
problem. Just call it after the zoom call and before the select.</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'>I sent
you all the DWF Viewer API a while back, so you have the necessary information.</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'>In
general, the difficulty is that the MapGuide "client API" is the
API common to DWF and <st1:place w:st="on"><st1:City w:st="on">AJAX</st1:City></st1:place>.
DWF Viewer has tons more API available (like this WaitForMapUpdated method)
that's just not exposed in the MapGuide client API layer.</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'>Walt</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>
<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'>
mapguide-users-bounces@lists.osgeo.org
[mailto:mapguide-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b><st1:PersonName w:st="on">Buscher, Shane</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, March 15, 2007
4:02 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] Viewer API
Selection Timing Issues</span></font><o:p></o:p></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'><!-- Converted from text/rtf format -->I may be going
about this the wrong way, but here’s my problem. I want to</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> select a
feature based on</span></font> <font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>an attribute query in the task pane, automatically
zoom to it, and</span></font> <font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>highlight</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>it. </span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I have found
highlighting the feature to be the most</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>problematic because the feature has
to exist within the map frame</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>extent before it can be selected
with</span></font> <font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>the SetSelectionXML() Viewer api function.</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>As far as I
know, this is the only function call you can make in MapGuide to</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>highlight
features. </span></font><o:p></o:p></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Knowing that SetSelectionXML() will only highlight
features in the current map extent, I preceded to zoom to the feature</span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>(ZoomToView)</span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>before
calling SetSelectionXML(). </span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>The problem is that the map
can’t zoom quick enough, and so no features</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>are highlighted:</span></font><o:p></o:p></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>ZoomToView(x, y, scale); </span></font> <o:p></o:p></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>SetSelectionXML(xmlSet); //no features exist
yet because of</span></font> <font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>delay in ZoomToView</span></font> <o:p></o:p></p>
<p style='margin-left:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>I don’t have</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>any problems when
the feature already exists in my map extent. Does anyone have a
workaround or better method to</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>accomplish this? </span></font>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>The
only hack can think of is to pause the</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>execution</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>of
SetSelectionXML() until ZoomoView is complete, but I’m not sure the best
way to code this. </span></font> <o:p></o:p></p>
<p style='margin-left:1.0in'><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:1.0in'><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Shane</span></font><o:p></o:p></p>
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