KMLLayer getLegendInfos

rscheitlin

API Team,

I am struggling to to the KMLLayer.getLegendInfos procedure...

Here is what I am trying so far:

var kmllayer:KMLLayer = new KMLLayer("http://explore.data.gov/download/db3a-9tgn/KML");
kmllayer.getLegendInfos(new AsyncResponder(kmlLegendResult,kmlLegendFault,null));

private function kmlLegendResult(lInfos:Array, token:Object):void
        {
            var llInfo:LayerLegendInfo = lInfos[0] as LayerLegendInfo;
            const layName:LegendDataItem = new LegendDataItem();
            layName.lname = llInfo.layerName;
            layName.id = Number.NaN;
            layName.label = llInfo.layerName;
            layName.minscale = llInfo.minScale;
            layName.maxscale = llInfo.maxScale;
            
            const lClass:LegendDataClassItem = new LegendDataClassItem();
            for(var ll2:int =0; ll2 < llInfo.legendItemInfos.length; ll2++){
                var lli:LegendItemInfo = llInfo.legendItemInfos[ll2] as LegendItemInfo;
                lClass.symbolitems.push(processRenderer(lli));
                layName.legendGroup.push(lClass);
            }
            _legendData.addItem(layName);
            FlexGlobals.topLevelApplication.dispatchEvent(new Event("legendDataLoaded$"));
        }
        
        private function kmlLegendFault(evt:FaultEvent):void
        {
            trace(evt.message);
            FlexGlobals.topLevelApplication.dispatchEvent(new Event("legendDataLoaded$"))
        }

legendItemInfos is always 0

Is this something that just does not work yet?

SarthakDatt

Robert,

The KML layer internally creates FeatureLayers(feature collection) and hence you do not see any additional legend request. It uses the renderer information on the featureLayer for creating  legend swatches.

The getLegendInfos() on the KML layer is waiting for these featureLayers to load which in this case is not happening before the responder is called. Have you tried other KML layer(s)?

As a work around for now, you could do something like:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" 
               xmlns:ags="com.esri.ags.*"
               xmlns:esri="http://www.esri.com/2008/ags"
               minWidth="955" minHeight="600">
    <fx:Script>
        <![CDATA[
            import com.esri.ags.events.LayerEvent;
            import com.esri.ags.layers.supportClasses.KMLScreenOverlay;
            import com.esri.ags.layers.supportClasses.LayerLegendInfo;
            import com.esri.ags.layers.supportClasses.LegendItemInfo;
            
            import flash.utils.clearTimeout;
            import flash.utils.setTimeout;
            
            import mx.controls.Alert;
            import mx.rpc.AsyncResponder;
            import mx.rpc.events.FaultEvent;
            
            private var timeOutVar:uint;

            protected function kmllayer1_loadHandler(event:LayerEvent):void
            {   
                timeOutVar = setTimeout(getKMLLegend, 100, event.layer); // wait for all feature layers to load
            }            
            
            private function  getKMLLegend(layer:KMLLayer):void
            {   
                clearTimeout(timeOutVar);
                
                layer.getLegendInfos(new AsyncResponder(kmlLegendResult,kmlLegendFault,null));
            }
            
            private function kmlLegendResult(lInfos:Array, token:Object):void
            {   
                var llInfo:LayerLegendInfo = lInfos[0] as LayerLegendInfo;
                Alert.show(llInfo.legendItemInfos.length.toString());
                for(var lii:int =0; lii < llInfo.legendItemInfos.length; lii++){
                    var lli:LegendItemInfo = llInfo.legendItemInfos[lii] as LegendItemInfo;
                    Alert.show( lli.label);
                }
            }
            
            private function kmlLegendFault(evt:FaultEvent):void
            {
                trace(evt.message);
            }
        ]]>
    </fx:Script>
    <ags:Map id="myMap"
             openHandCursorVisible="false">
        <esri:KMLLayer name="KML Layer" alpha="1" visible="true" 
                       url="http://geocommons.com/overlays/119539.kml"
                       load="kmllayer1_loadHandler(event)"/>
    </ags:Map>
    
</s:Application>