topic Re: map load error in ArcGIS API for Flex Questions

map load error

MarkHorsell — Mon, 01 Aug 2011 09:34:21 GMT

I'm getting this error on the line in bold.

TypeError: Error #1009: Cannot access a property or method of a null object reference.

When i remove load="attrInsp.featureLayers = [points]" it does compile.

<esri:Map id="myMap" load="attrInsp.featureLayers = [points]" wrapAround180="true"
     mapClick="map_mapClickHandler(event)"
     openHandCursorVisible="false"
     x="{splitX}"
     width="{916-splitX}"
     height="398"



     >

<esri:extent>
   <esri:Extent id="sheepfire"
       xmin="-13144000" ymin="4033000" xmax="-13066000" ymax="4099000">
    <esri:SpatialReference wkid="102100"/>
   </esri:Extent>
</esri:extent>

<esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" />

<esri:FeatureLayer id="fireAreas"
         mode="selection"
         outFields="*"
       url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/FeatureServer/2">
        </esri:FeatureLayer>

<esri:FeatureLayer id="points"
         mode="selection"
         outFields="*"
         url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/FeatureServer/0">

</esri:FeatureLayer>

<esri:GraphicsLayer id="myGraphicsLayer" />

<esri:infoWindowContent>
   <s:BorderContainer backgroundColor="0xFFFF00">
    <esri:AttributeInspector id="attrInsp"
           deleteFeature="attrInsp_deleteFeatureHandler(event)"
           updateFeature="attrInsp_updateFeatureHandler(event)">

     <esri:FieldInspector featureLayer="{points,fireAreas}"
           fieldName="description"
           label="ACTIVE_PRODUCTION"/>

     <esri:FieldInspector featureLayer="{points}"
           fieldName="type"
           label="FIELDNAME"/>

     <esri:FieldInspector featureLayer="{fireAreas}"
           fieldName="name"
           label="PRODUCTION_OIL">
      <esri:renderer>
       <fx:Component>
        <esri:ButtonBarField>
         <esri:dataProvider>
          <s:ArrayCollection>
           <fx:Object label="Yes" value="Yes"/>
           <fx:Object label="No" value="No"/>
          </s:ArrayCollection>
         </esri:dataProvider>
        </esri:ButtonBarField>
       </fx:Component>
      </esri:renderer>
     </esri:FieldInspector>
    </esri:AttributeInspector>
   </s:BorderContainer>
</esri:infoWindowContent>

</esri:Map>

Re: map load error

RobertScheitlin__GISP — Mon, 01 Aug 2011 10:49:52 GMT

Mark,

When you use a variable in MXML for a property or attibute it has to be in curly braces.

{attrInsp.featureLayers = [points]}

Re: map load error

MarkHorsell — Mon, 01 Aug 2011 11:11:23 GMT

Hi Robert,
Thanks very much for your time, in this case curly braces don't work. As yet I only have basic understanding of the API so have been looking at sample code and in this case im trying to replicate some of the functionality in the "AttributeInspectorInfoWindowEditable" sample as below. I'm using the same SWC 2.3.1 and a version 10 server.

From the sample code
<esri:Map id="myMap"
              load="attrInsp.featureLayers = [myFeatureLayer]"
              mapClick="map_mapClickHandler(event)"
              openHandCursorVisible="false">

which does work. I probably have omited something obvious, but have spent hours trying to work out what.

Re: map load error

BenFerguson — Mon, 01 Aug 2011 22:01:16 GMT

You are actually doing an inline function there, so your syntax is ok. I'm not seeing anything wrong with it. I copied it into a blank project and got it to compile just fine.

Re: map load error

MarkHorsell — Wed, 10 Aug 2011 09:32:24 GMT

I changed:

load="attrInsp.featureLayers = [points]"

to

load="onMapLoad(event)"

private function onMapLoad(p_evt:Event){

trace(attrInsp);//null??
trace(attrInsp.featureLayers);
trace(points);
attrInsp.featureLayers =[points];

}

//TypeError: Error #1009: Cannot access a property or method of a null object reference.

The Attribute Inspector is null. Its as if the map load event fires before the layers are added.

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

Re: map load error

MarkHorsell — Wed, 10 Aug 2011 09:38:41 GMT

Removed the onLoad and ran the same trace statements on mapClick.

Still can't find the attrInsp instance?

Re: map load error

MarkHorsell — Wed, 10 Aug 2011 11:52:41 GMT

Now i've just taken the whole "AttributeInspectorInfoWindowEditable" wrapped it in Group instead of application and have just added it to stage. But it doesnt render at all. My thinking is that this is just not possible using the API.