<API 2.0>Switching Basemaps

http://help.arcgis.com/en/webapi/flex/samples/index.html

<Mapping>---->Switching Basemaps

<?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:esri="http://www.esri.com/2008/ags"
               pageTitle="Toggle between Map Services">
    <!--
    This sample shows one way of allowing users to change between different basemaps.
    It also ensures that the levels of detail (LOD) are updated based on which basemap is selected.
    If all base maps have the same LODs, you wouldn't need the layerShowHandler function.
    -->
    <fx:Script>
        <![CDATA[
            import com.esri.ags.geometry.MapPoint;
            import com.esri.ags.layers.TiledMapServiceLayer;
            
            import mx.events.FlexEvent;
            
            private function layerShowHandler(event:FlexEvent):void
            {
                // update the LODs/zoomslider to use/show the levels for the selected base map
                var tiledLayer:TiledMapServiceLayer = event.target as TiledMapServiceLayer;
                myMap.lods = tiledLayer.tileInfo.lods;
            }
        ]]>
    </fx:Script>
    
    <esri:Map id="myMap"
              level="4"
              load="myMap.centerAt(new MapPoint(-11713000, 4822000))">
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"
                                         visible="{bb.selectedIndex == 0}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/USA_Topo_Maps/MapServer"
                                         visible="{bb.selectedIndex == 1}"/>
        <esri:ArcGISTiledMapServiceLayer show="layerShowHandler(event)"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"
                                         visible="{bb.selectedIndex == 2}"/>
    </esri:Map>
    <s:ButtonBar id="bb"
                 right="5" top="5"
                 requireSelection="true">
        <s:dataProvider>
            <s:ArrayList>
                <fx:String>Streets</fx:String>
                <fx:String>U.S. Topo</fx:String>
                <fx:String>Imagery</fx:String>
            </s:ArrayList>
        </s:dataProvider>
    </s:ButtonBar>
</s:Application>

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