HI,
try to use the "property" function:
http://docs.geoserver.org/stable/en/user/filter/function_reference.html#feature-functions

In CSS I believe it would look something like this, but I have not tested
it:

 label: [property(env('label_column','street_prefix'))];

Cheers
Andrea

On Thu, Apr 20, 2017 at 10:39 AM, Murad Jamal <m.ja...@unsw.edu.au> wrote:

>
> Hello All
>
> i have
>
> css style like this
>
> {
>    fill: #d3d3d3;
>    fill-opacity: 0.0;
>    stroke:#acad88;
>    stroke-width:0.25;
>    label: [env('label_column',street_prefix)];
>    label-anchor: 0.5 0.5;
>    font-fill: #4e4f3b;
>    font-family: "Dialog";
>    font-size: 8;
>    halo-radius: 1;
>    halo-color: white;
>    halo-opacity:0.8;
>  }
>
> i thought in url
>
> when i use
> &env=label_column:id on WMS
>
> it is not getting label column value
>
> instead just labelling with id text everywhere
>
> not the value of id
>
> is it possible to dynamically specify label column
>
>
> THanks
>
> Murad
>
>
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