[OpenLayers-Users] Query problem

[Arnd Wippermann]

Hi,

It seems, that your loop creates the window for your first queryable layer
and then the queryresult of your next queryable layers use the same window
and overwrite the contents of the window "getfeatureinfo". The last wins.

If you change the window name to "getfeatureinfo" + i, then you should get
one window for every query.

A second approach is to collect the visibible layers and do only one
getfeatureinfo request with this layerlist. Then you get back from MapServer
one result html for all the queried layers.


Arnd



-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Aypes2
Gesendet: Freitag, 13. November 2009 08:24
An: users at openlayers.org
Betreff: [OpenLayers-Users] Query problem


Dear all,

I just got a query problem. I have several overlays, and I want them to be
queryable when they are turned on (visible) only. But I found if I turn on
two or more overlays, only 1 layer can be queried and other visible overlays
give no result (empty template in mapfile). Here is my code:

map.events.register('click', map, function (e) {
    var oplayers = new Array( alayer.visibility, blayer.visibility,
clayer.visibility, dlayer.visibility, elayer.visibility, flayer.visibility);
    var mslayers = new Array("a","b","c","d","e","f");
    var i=0;
    for (i=0; i < 7; i++) {
    if ( oplayers[i] == true ) { 
    var url = "http://localhost/cgi-bin/mapserv.exe"
      + "?map=c:/ms4w/Apache/htdocs/mapfile.map" 
      + "&REQUEST=GetFeatureInfo"
      + "&VERSION=1.1.1"
      + "&EXCEPTIONS=application/vnd.ogc.se_xml"
      + "&BBOX=" 
      + map.getExtent().toBBOX()
      + "&X=" + e.xy.x
      + "&Y=" + e.xy.y
      + "&INFO_FORMAT=text/html"
      + "&QUERY_LAYERS=" + mslayers[i]
      + "&LAYERS=" + mslayers[i]
      + "&FEATURE_COUNT=1"
      + "&SRS=EPSG:4269"
      + "&STYLES="
      + "&WIDTH=" + map.size.w
      + "&HEIGHT=" + map.size.h;
        window.open(url,
                  "getfeatureinfo",
                  "location=0,status=0,scrollbars=1,width=600,height=400"
        );
      };
    };
  });
alayer,blayer,clayer,dlayer,elayer,flayer are names of layers defined in
html. (var alayer = ......) a,b,c,d,e,f are the layer names of the mapfiles.

The only querable layer is the 'highest' one. For example, if I turn on
alayer and blayer, blayer can be queried but alayer cannot. If alayer,
blayer and flayer are on, only flayer can be queried. 

I find that the layer with higher variable i ([ oplayer[i] ]) would be
queried only. I know there is a function called WMSfeatureGetinfo but I
don't know how to use it. I just know it has queryVisible which can filter
the hidden layers, but error 'permission denied' always comes out when I
click on the query layer.

I prefer my method, and I think the logic of my code is okay but something
is wrong. Can anyone get idea about that?

Regards,
Aypes2
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