topic RE: RE: Query Widget from New Sample Viewer in ArcGIS API for Flex Questions

Query Widget from New Sample Viewer

JamesFaron — Wed, 07 Apr 2010 16:35:21 GMT

I need to modify this widget to return only two 'baseMaps' (it is written to return all baseMaps). I have been successfull except for one problem: the list in the combo box populates with duplicate values, 5 in fact, or 10 if I choose to include 2 layers, as in my example below. I use an index value to select the layer (the default is var i from the loop).
The original script is as follows:

private function getBasemapLayer():ArrayCollection
   {
    var baseMaps:ArrayCollection = new ArrayCollection();
    for(var i:Number=0; i<configData.configBasemaps.length; i++)
          {
           baseMaps.addItem(configData.configBasemaps.label);
          }
    return baseMaps;
   }
// TODO: Change to pull from configdata object
      private function getLayers():ArrayCollection
   {
    var basemapLyrs:ArrayCollection = getBasemapLayer();
    var layers:ArrayCollection = new ArrayCollection();
    for(var i:Number = map.layerIds.length -1; i >= 0; i--)
    {
     var basemapLyr:Boolean = false;
     for each(var id:String in basemapLyrs){
      if (map.layerIds == id){
       basemapLyr = true;
       break;
      }
     }
     if (basemapLyr) continue;
     var layer:Layer = map.getLayer(map.layerIds);
     if(!(layer is GraphicsLayer))
      layers.addItem(layer);
    }
    return layers;
     }

My modification is to the last section:

                                        if (basemapLyr) continue;
     var layer:Layer = map.getLayer(map.layerIds[2]);
     var layer2:Layer = map.getLayer(map.layerIds[3]);
     if(!(layer is GraphicsLayer))
      layers.addItem(layer);
      layers.addItem(layer2);
    }
    return layers;
     }

Attached is a jpg of the combo box: it is populated with the two layers, but in pairs of 5, i.e. five duplicate items each (the second layer is in white, hard to see) .

The dataprovider for the combo box is mMapServices, which is declared = to the getLayers() function in the init().

Thanks,
Jim Faron

Re: Query Widget from New Sample Viewer

RobertScheitlin__GISP — Sat, 11 Dec 2021 11:50:39 GMT

Jim,

Use this instead

if (basemapLyr) continue;
 var layer:Layer = map.getLayer(map.layerIds);
 if(!(layer is GraphicsLayer))
  if(layer.id == "the name of your first layer" || layer.id == "the name of your second layer")
   layers.addItem(layer);
 }
 return layers;
}

Query Widget from New Sample Viewer

JamesFaron — Wed, 07 Apr 2010 18:02:36 GMT

Robert,

Worked perfectly!

Thanks once again for your help.

Jim Faron

RE: RE: Query Widget from New Sample Viewer

JasonHancheruk — Mon, 19 Apr 2010 21:24:21 GMT

I have a newbie question regarding the Query Builder Widget. If i am okay taking all the layers under a service, how do I go about setting that up. Right now I have numerous layers under two different livemaps, but when I click on the Map Service tab, I receive the two services but "no layers" found after clicking "apply" and then "search".

Any help would be great.

Thanks,
Jason

Re: Query Widget from New Sample Viewer

SusanMordy1 — Tue, 18 May 2010 21:20:22 GMT

I was able to implement Robert's above code to define which map services are available in the drop down box.

Does anyone know how I can define which map service layers are available in the 'Target Layer' drop down box?

Thanks very much.

Re: Query Widget from New Sample Viewer

CristianJonhson — Wed, 19 May 2010 11:36:37 GMT

What about if i want to ask for unique values of a field? cause it will make a query @ all my layers but will return me only 500(or configured number of) features, how i can set the query to select only "DISTINCT" values?

Thanks in advance,
Cristiano Benato.