[Chameleon] theme selector

[Paul Spencer]

Bart,

it is possible that the XMLThemeLegend may do the job for you.  One way 
of displaying layers using the XMLThemeLegend widget is as a 'radio' 
group, which means that only one layer in a 'theme' can be on at a time. 
  The XMLThemeLegend uses Themes and Groups.  Themes contain Groups, 
Groups contain Layers ... and a Layer is a mapserver layer.  This means 
that you can control groups of layers with a single control.  This 
allows you do do things that are not possible within mapserver's current 
'group' support.

The Hawaii demo uses this widget.  It is a bit complicated to set up, 
and not very well documented, but it may be worthwhile.

A second option would be the creative use of the mapserver GROUP 
attribute, it can be used with the html legend control quite nicely.

Cheers,

Paul

Bart van den Eijnden wrote:

> Hi list,
> 
> I have a question about some functionality. I do not know whether or not 
> this functionality is present in Chameleon.
> 
> I have a Chameleon application which has 3 themes. Each theme uses a 
> different classification on the same data. Let's call them Theme A, B 
> and C for simplicity. These 3 themes are available for three moments in 
> time, 1980, 1990 and 2000. So at the moment I have 9 layers in my 
> application.
> 
> I want to present the user a select box with the three themes, based on 
> which the layers are shown, in the map and in the LegendTemplate widget.
> 
> In what way would it be possible to implement this functionality? By 
> using a simple convention in the layer names for instance?
> 
> Also, Chameleon has a TimeFilter widget which would perform this kind of 
> functionality based on the time instead of based on the theme. But if I 
> understand correctly Mapserver does not support the time parameter from 
> the WMS spec yet?
> 
> Best regards,
> Bart
> _______________________________________________
> Chameleon mailing list
> Chameleon@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/chameleon
> 

-- 
  -----------------------------------------------------------------
|Paul Spencer                           spencer@dmsolutions.ca    |
|-----------------------------------------------------------------|
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
  -----------------------------------------------------------------