mapscript setExpression problems

[Doyon, Jean-Francois]

Humm, well my first thought would be about those escaped double-quotes ...
do you really need them ?

Wouldn't just $class->setExpression("Bankside Gallery");

work ? Of course if the double quotes are IN the DBF, that could be weird
...

J.F.

> ----------
> From: 	Robert Chavez[SMTP:rchavez at perseus.tufts.edu]
> Sent: 	Friday, October 20, 2000 10:57 AM
> To: 	mapserver-users at lists.gis.umn.edu
> Subject: 	mapscript setExpression problems
> 
> 
> Howdy folks,
> 
> I'm having some trouble changing an expression in a layer using
> setExpression.  All this should do is highlight the polygon whose NAME
> attribute matches "Bankside Gallery" but when the map draws I get a blank
> layer, no highlighting.
> 
> Spelling and capitalization are correct and the original expression in the
> layer renders correctly, so I must be doing something wrong with
> setExpression.  Can anyone shed a little light?  I'm using version
> 3.3.011.
> 
> Here's my snippet of code:
> 
> $layer = $map->getLayerByName(leis);
> $class = $layer->getClass(0);
> $class->setExpression("\"Bankside Gallery\"");
> $layer->draw($map, $img);
> 
> and mapfile layer:
> LAYER
>  NAME leis
>  TYPE POLYGON
>  STATUS DEFAULT
>  DATA blg_leis
>  CLASSITEM "NAME"
>  CLASS
>    EXPRESSION "Buckingham Palace"
>    COLOR 255 204 0
>  END
> END
> 
> Thanks,
> Rob Chavez
> Perseus Project
>