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

[Paul Spencer]

I should note that the bug was not in PHP MapScript.  Apparently if you 
call file_exists( "" ); with an empty path it returns true.  This test 
was being used to determine if a valid template was already set and was 
returning true when a template was not set at all.  This fix will be in 
the final 2.0 release.

Appologies to MapScript guys for suggesting that there was a bug ;)

Cheers,

Paul

Paul Spencer wrote:
> All,
> 
> 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.
> 
> Cheers,
> 
> Paul

-- 
Paul Spencer
Applications and Software Development
DM Solutions Group Inc.
http://www.dmsolutions.ca