[OpenLayers-Dev] this.callbacks is undefined error

[bartvde at osgis.nl]

Hi,

first of all, please don't cross-post to dev and users if it is not
necessary.

Maybe you can check out the following for pointers:

http://dev.openlayers.org/sandbox/bartvde/wmsgetfeatureinfo/openlayers/lib/OpenLayers/Control/FeatureInfo.js

http://dev.openlayers.org/sandbox/bartvde/wmsgetfeatureinfo/openlayers/examples/featureinfo-control.html

Best regards,
Bart

> Good Day Everyone
>
>
>
> I want to make use of the GetFeatureInfo functionality, but I want to do
> so by clicking a button on the map panel. Below is the coding that I am
> using. I click on the button and when I click on a feature point I get
> the following error displayed below in firebug. FYI, I am using
> OpenLayers 2.7. Can someone please help me with this?
>
>
>
> ERROR:
>
> this.callbacks is undefined
>
> OpenLayers.js (line 662)
>
>
>
> SOURCE CODE:
>
>  var featureInfo;
>
>
>
>  // build the featureInfo (aka query tool/button)
>
>  featureInfo = new OpenLayers.Control(
>
>                   {title: "Query map features",
>
>                    displayClass: "olControlFeatureInfo"});
>
>
>
>  // register events to the featureInfo tool
>
>  featureInfo.events.register("activate", featureInfo, function() {
> toggleQueryMode(); });
>
>  featureInfo.events.register("deactivate", featureInfo, function() {
> toggleQueryMode(); });
>
>
>
> panel.addControls([featureInfo]);
>
>
>
>  // support GetFeatureInfo
>
>  queryEventHandler = new OpenLayers.Handler.Click({'map': map, 'click':
> function(e) { doGetFeatureInfo(e); } });
>
>
>
>
>
>  function toggleQueryMode() {
>
>    if(featureInfo.active) {
>
>       queryEventHandler.activate();
>
>     } else {
>
>          queryEventHandler.deactivate();
>
>    }
>
>  }
>
>
>
>  function doGetFeatureInfo(e) {
>
>    document.getElementById('nodelist').innerHTML = "Loading... please
> wait...";
>
>    var url =  map.layers[0].getFullRequestString(
>
>              {REQUEST: "GetFeatureInfo",
>
>               EXCEPTIONS: "application/vnd.ogc.se_xml",
>
>               BBOX: map.getExtent().toBBOX(),
>
>               X: e.xy.x,
>
>               Y: e.xy.y,
>
>               INFO_FORMAT: 'text/html',
>
>               QUERY_LAYERS: map.layers[0].params.LAYERS,
>
>               FEATURE_COUNT: 50,
>
>               WIDTH: map.size.w,
>
>               HEIGHT: map.size.h},
>
>               "http://10.128.78.27:8080/geoserver/gwc/service/wms");
>
>    OpenLayers.loadURL(url, '', this, setHTML, setHTML);
>
>    OpenLayers.Event.stop(e);
>
>  }
>
>
>
> Thanks
>
> Raj.
>
>
>
>
>
>
> .
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