[Chameleon] Legend Update causes layers to disappear
Peter Kingsbury
peter.kingsbury at gmail.com
Thu Sep 1 13:22:23 EDT 2005
An issue exists in my chameleon-app where the layers will disappear
after updating the map!
An example of the first Update:
- layers listed in legend will update properly (checked layers appear,
unchecked layers disappear)
- layers not in legend whose STATUS value is DEFAULT will remain in the
map view area
- remaining non-legend, STATUS=ON layers are removed from view
And the second update (and beyond):
- layers listed in legend continue to behave as expected
- STATUS=DEFAULT layers not in legend are removed from view
- STATUS=ON layers not in legend continue to remain hidden from view
Here are some code examples of what I am using... The "always on" rivers
layer which stays put after the first Update, but disappears after
subsequent updates, and a normal initially-invisible layer which the
legend controls just fine:
#----------------------------------
LAYER
GROUP "Base Layers"
NAME "Rivers"
TYPE POLYGON
DATA rivers
STATUS DEFAULT
CLASS
NAME "Rivers"
COLOR 48 100 230
OUTLINECOLOR 64 128 255
END
METADATA
SHOWINLEGEND "no"
END
END
LAYER
GROUP "Sites"
NAME "Sites"
TYPE POINT
DATA sites
TOLERANCE 6
STATUS OFF
HEADER '../query/query_header.html'
FOOTER '../query/query_footer.html'
MAXSCALE 30000
METADATA
SHOWINLEGEND "yes"
END
CLASSITEM "sites"
LABELITEM "sites"
END
#----------------------------------
The legend template layer section:
[leg_layer_html order_metadata=legend_order opt_flag=15]
[if name=SHOWINLEGEND oper=eq value="yes"]
<tr bgcolor="#ffffff">
<td align="center" width=20>
<input type="checkbox" name="legendlayername[]"
value="[leg_layer_name]"
[if name=layer_status oper=eq value=1]CHECKED[/if]
[if name=layer_status oper=eq value=2]CHECKED[/if]>
</td>
<td>
<img src="[leg_icon width=20 height=18]" width="20"
height="18">
</td>
<td>
<span class="label">[leg_layer_name]</span>
</td>
</tr>
[/if]
[/leg_layer_html]
And finally, the LegendTemplate widget:
<cwc2
type="LegendTemplate"
visible="true"
embedded="true"
template="legend_template.html"
popupstyleresource="TextButtons"
popupwidth="500"
popupheight="400"
status="false"
menubar="false"
/>
Is this a circular catch-22 problem? Is there a way around this behavior?
Best regards,
- Peter
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