[maplab-users] MapEdit preview problem - empty legend & blank map.

Paul Spencer
Fri, 14 Mar 2003 17:23:49 -0500

I thought that someone on the list had mentioned this problem, I can't 
remember who and can't seem to find the email.  We have discovered it 
also.  The problem is when you open the preview in MapEdit, your legend 
has no layers in it and any navigation ends up with a blank map. 
Interestingly, closing the preview and opening it again will display the 
map once more (still no layers in the legend and navigating again turns 
them off).

This problem is due to a small bug in MapScript when trying to 
programmatically set the value of legend->template when there is no 
value to begin with.

The work-around is to always place a value in the legend -> template 
object.  The value is immaterial since it is overwritten with the 
legend_template.html from the mapedit directory.  But the value must be 
there to be overwritten.

This bug appears to be in all 3.6 versions of MapScript, not sure about 
3.7 since mapedit won't really work with 3.7 anyway.


Paul Spencer
Applications and Software Development
DM Solutions Group Inc.

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