[fusion-users] ¿How to programatically change the raster file a layer is pointing to?

[jsanchez]

As I suspected, my kung-fu wasn't strong enough to solve the problem I
described in my previous post.
Thank to Paul tips I've made some progress but I failed to get what I was
looking for.
I've changed a little my initial approach and that's why I'm posting this in
a new thread. 

1) I'm using a little mapfile with only four layers, one of them (the base
layer) is a raster which points to a 'image1.tif'.

2) I'd like to have the possibility to select the geotiff shown as base
layer.

3) I think the way to do this in mapscript is to 'redirect' the parameter
'data' of the layer to a new raster file:

            $oMap = ms_newMapObj($szMapFile);
            $baselayer=$oMap->getLayer(0);
            $baselayer->set("data" "image2.tif");

But I have no idea about how to transfer the name of new image from my form
at index.html to LoadMap.php.

4) From Paul code I understood that the right way to do this was introducing
in index.html a couple of functions like these:

function ChangeRaster(newimage) {
    var params='mapfile=/var/www/data/mapfile.map&newdata='+newimage;
    var opts = {parameters: params, onComplete: reload.bind(null)};
    var s =  "layers/MapServer/php/ChangeRaster.php";
    Fusion.ajaxRequest(s, opts);
}

function reload(){
    var mapWidget=Fusion.getMapById('Map');
    maps=mapWidget.getAllMaps();
    map=maps[0];
    map.reloadMap();
}

ChangeRaster.php is just a copy of LoadMap.php in which I inserted the
mapscript code mentioned above to change the data of the layer:

            $newimage=$_REQUEST['newdata'];
            $oMap = ms_newMapObj($szMapFile);
            $baselayer=$oMap->getLayer(0);
            $baselayer->set("data", $newimage);

As far as I understand, by selecting a new raster from a listbox,
'ChangeRaster()' is called, then 'ChangeRaster.php' is executed and when
completed, 'reload()' is called to make a map reload showing the updated
image. 

Unfortunately, it didn't work and I have no more ideas to test.....
 Any clues would be appreciated.


J. Sanchez
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