Turning on and off labels

[Sean Gillies]

Set the labelitem property of the layer to null.

On Jan 25, 2006, at 7:42 AM, Stuart Eve wrote:

> Right, just incase this is useful for anyone - I have managed to do a
> bit of a hacky solution to turning the labels off:
>
> I set the 'labelrequires' option of the layers to evaluate true if I
> wanted the label to be drawn and false if I didn't.
>
> Thus:
>
>      $layerObj = $map->getLayerByName($name);
>      $layerObj->set("labelrequires", "1 == 1");
>
> turns the label on for layer $name.
>
> and....
>
>      $layerObj = $map->getLayerByName($name);
>      $layerObj->set("labelrequires", "1 == 2");
>
> Turns it off.
>
> It feels a bit of a hack, so if anyone has anything more elegant  
> I'd be
> happy to hear it.
>
> Stu
>
>
>> Thanks Norbert, thats certainly an option (which I hadn't thought  
>> of!)
>> and I may do that - I was just hoping that I would be able to find a
>> way to do with Mapscript (so I don't have to have such a huge  
>> mapfile!)
>>
>> Stu
>>
>>
>>> Hi,
>>>
>>> I'm not sure if this is what you want but you can make a layer for
>>> the data and a separate one for the labels then you can turn them on
>>> or off.
>>>
>>> Regards,
>>>
>>> Norbert
>>
>>
>>
>>
>>
>> Stuart Eve wrote:
>>
>>> Hi all,
>>>
>>> I am trying to use Mapscript to turn off labels 'on-demand'. I have
>>> my label information set up in my mapfile - but this means that they
>>> are always drawn. I want to retain that information in the mapfile
>>> (rather than recreating the whole thing with Mapscript), so was
>>> wondering if there was a way to tell Mapserver if they should be
>>> drawn or not (without turning the whole layer off!). I have tried
>>> using a 'STATUS OFF' within the label tags, but that doesn't work  
>>> (of
>>> course!).
>>>
>>> Any ideas?
>>>
>>> Stu
>>>
>>

---
Sean Gillies
sgillies at frii dot com
http://zcologia.com/news