MapServer 5.4 does open up this possibility. It's not done via substitution but
rather by passing
a bit of mapfile syntax. For example,
...&map.layer[foo]=LABELITEM+newitem&...
However, you must set a validation pattern for MapServer to compare the new
value against before
it will change it. So your layer definition might look like:
LAYER
NAME 'foo'
...
VALIDATION
'labelitem' '^item1|item2|item3$'
END
...
LABELITEM 'item1'
END
In this case you could dynamically change LABELITEM to item1, item2 or item3
but item4 would throw
an error. Hope this helps.
Steve
>>> On 6/29/2009 at 1:08 PM, in message
>>> <[email protected]>,
stretch <[email protected]> wrote:
> Anyone have any ideas?
>
> stretch wrote:
>>
>> Hi All
>>
>> We are using mapserv cgi to generate WMS and access via openlayers.
>>
>> Searching reveals that it is not possible to dynamically change the
>> labelitem by substitution i.e
>> LABELITEM='%LABELFIELD%'
>>
>> Is it possible however to do it via &map_layername_labelitem="labelfield"
>> in your url, or any other such method. Any help would be really
>> appreciated, because otherwise it means creating different layers for each
>> labelling option.
>>
>> Thanks
>> Andrew
>>
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