[ka-Map-users] Loading layer data dynamically in kaMap

[Mackabre]

Hello to all kaMap users!

Background:

I am trying to "port" a project, done with Mapserver and javascript, to
kaMap. The program has the functionality to check/uncheck layers and add the
data

dynamically from a database. This is necessary because the data are updated
continuously, e.g. vehicle position... 

 
The processor savings with the caching of tiles mainly influenced my choice
to move to kaMap. I lose the map quite often with Mapserver only.

 
Question:

I have a sql database server which contains the data for my layers (position
etc.). I need to load the data into layers at runtime and update the layers

continuously. The problem is that although the javascript from init.php show
that the layer is added (or at least the correct parameters are inserted)
e.g.

-------------------------------------------------------------------------------------------------------------------------------------------------

map.addLayer(new _layer( {
name:'taxi',visible:true,opacity:100,imageformat:'png',queryable:false,tileSource:'redraw',redrawInterval:10000,refreshInterval:5000,scales:
new Array('1','1','1','1','1','1','1','1','1')}));"; 

-------------------------------------------------------------------------------------------------------------------------------------------------
BUT: when I later do a getlayerByName('taxi') in an AJAX called php file to
load the data, which is called every 2s, the layer does not exist.

 
Here is my layer in the mapfile:

 

-------------------------------------------------------------------------------------------------------------------------------------------------
#####################################################
# Unit layer could be a Vehicle or Dispensing unit

 

LAYER

    NAME "taxi"

    GROUP "taxi"

    STATUS ON

    DATA "missing"

    METADATA

          "tile_source" "redraw"

          "redraw_interval" "10000"

          "refresh_interval" "5000"

    END

    TYPE point

    LABELCACHE on

          CLASS

              SYMBOL "Taxi"

              SIZE 30

              STYLE

                  COLOR -1 0 0

              END

              TEXT ""

              LABEL

                  BUFFER 20

                  TYPE Truetype

                  FONT "arial"

                  SIZE 8

                  POSITION uc

                  COLOR 0 0 0

                  ANGLE AUTO      

             END

     END

END

-------------------------------------------------------------------------------------------------------------------------------------------------
 

I tried to use KaXmlOverlay, which worked OK, but

-> I already have code for an overlib imagemap, for tooltip and click menu,

-> support for the overlay tooltip is lacking, and

-> overlays can't be switched on/off with usual layer checking.

 

I need this to work or my motivation for using kaMap would be nullified,

Any help will be much appreciated!

 

Schalk Snyman

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