Clearing map lods (Flex beta 2.0)

DarcyDechene

Hi,

I�??m trying to toggle between a dynamic map (with no lods) and a tiled map service (with lods) then back again. Going from the dynamic to tile map service is fine, however after going back and clearing the map lods (map.lods = null) I get exceptions when panning/zomming:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
 at com.esri.ags.components::Navigation/map_extentChangeHandler()
 at flash.events::EventDispatcher/dispatchEventFunction()
 at flash.events::EventDispatcher/dispatchEvent()
 at mx.core::UIComponent/dispatchEvent()
 at com.esri.ags::Map/tweenEndHandler()
 at flash.events::EventDispatcher/dispatchEventFunction()
 at flash.events::EventDispatcher/dispatchEvent()
 at MoveResize/enterFrameHandler()

This �??feature�?� worked with the Flex 1.x API, so is there another way to do this in the Flex 2.x API or will this simply no longer work. I have attached a Flex 1.x example and a Flex 2.x example.

Any ideas how this can be done in Flex 2.x beta?

Thanks,
Darcy

Map_v3.txt.zip

Map_v4.txt.zip

BufferProblem.gdb.7z.zip

9-20-2012 2-56-30 PM.jpg

BBicking1_0-1727733362333.png

gis-academic-12x6-a.png

Anonymous User

Original User: dpaddock

This should be fixed in the next release. As a work-around, try creating a new Navigation component when you do the switch. Here's a sample. (zoomSliderVisible is set to false on the map.)

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                xmlns:esri="http://www.esri.com/2008/ags"
                layout="absolute">

    <mx:Script>
        <![CDATA[
            import com.esri.ags.components.Navigation;

            import mx.events.FlexEvent;

            private var navigation:Navigation;

            private function toggleBase():void
            {
                if (tiledLyr.visible)
                {
                    // switch to dynamic layer
                    tiledLyr.visible = false;
                    dynamicLyr.visible = true;

                    map.lods = null;
                    map.scale = 100000000;
                }
                else
                {
                    // switch to tiled layer
                    tiledLyr.visible = true;
                    dynamicLyr.visible = false;

                    map.lods = tiledLyr.tileInfo.lods;
                    map.scale = 100000000;
                }
                setNavigation();
            }

            private function map_initializeHandler(event:FlexEvent):void
            {
                setNavigation();
            }

            private function setNavigation():void
            {
                if (navigation)
                {
                    navigation.map = null;
                    map.staticLayer.removeElement(navigation);
                }
                navigation = new Navigation();
                navigation.map = map;
                map.staticLayer.addElement(navigation);
            }
        ]]>
    </mx:Script>

    <esri:Map id="map"
              initialize="map_initializeHandler(event)"
              zoomSliderVisible="false">
        <esri:ArcGISTiledMapServiceLayer id="tiledLyr"
                                         url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"
                                         visible="true"/>
        <esri:ArcGISDynamicMapServiceLayer id="dynamicLyr"
                                           url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Petroleum/KGS_OilGasFields_Kansas/MapServer"
                                           visible="false"/>
    </esri:Map>

    <mx:Button right="10" top="10"
               click="toggleBase()"
               label="Toggle"/>

</mx:Application>