topic Table of Contents Popup in ArcGIS API for Flex Questions

1119: Access of possibly undefined property reference with static type Class

GregMcNeill — Wed, 28 Jul 2010 15:55:33 GMT

Hello, I am trying to modify the Dynamic_TOC.mxml example that came with the 1.3 API Library for Flex. What I want to do is get the TOC to display in a popup window instead of in a box alongside the map as in the example. I have added another mxml component called Layers.mxmlfor the popup window but I am having an issue accessing the ArcGISDynamicMapServiceLayer on the Application mxml, I get the following error ???1119: Access of possibly undefined property myDynamicService through a reference with static type Class.??? My experience with Flex is very limited, I am learning as I am working through the issues, but I am guessing I have an issue with scope of the object and I don???t know how to instantiate globally. Here is excerpts from my two mxml files with Map.mxml being the default application file:

Map.mxml

[INDENT]<esri:Map id="myMap">
[INDENT]<esri:ArcGISDynamicMapServiceLayer
[INDENT]id="myDynamicService"
url="http://localhost/ArcGIS/rest/services/myMap/MapServer"
load="myDynamicService.defaultVisibleLayers()"/>[/INDENT][/INDENT]
</esri:Map>[/INDENT]

[INDENT]//This works while it is on the same mxml
<layers:LayerTOC layer="{myDynamicService}" height="100%" width="230"/>[/INDENT]
Layers.mxml

<mx:TitleWindow
[INDENT][INDENT]xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:esri="http://www.esri.com/2008/ags"
xmlns:layers="layers.*"
title="Map Layers"
showCloseButton="true"
verticalScrollPolicy="auto"
horizontalScrollPolicy="auto"
width="260" height="230"
close="{PopUpManager.removePopUp(this)}">[/INDENT]

[INDENT]<mx:Script>
[INDENT]<![CDATA[
[INDENT]import mx.managers.PopUpManager;[/INDENT]
]]>[/INDENT]
</mx:Script>

//This throws the error when it is on a different mxml
<layers:LayerTOC layer="{Map.myDynamicService}" height="100%" width="230"/>[/INDENT]
</mx:TitleWindow>[/INDENT]

Any help is greatly appreciated,

Thanks,

Greg

Re: 1119: Access of possibly undefined property reference with static type Class

DrewDowling — Wed, 28 Jul 2010 16:10:53 GMT

I haven't used the Dynamic_TOC.mxml but I think I would try adding a public property of type layers or dynamiclayer, or whatever is required, to the new layers.mxml. Something like

private var _layer:Layer;

            public function get layer():Layer
            {
                return _layer;
            }

            public function set layer(value:Layer):void
            {
                _layer = value;

            }

Then in your main mxml you can set this property once you have declared the now component Dynamic_TOC.mxml

Re: 1119: Access of possibly undefined property reference with static type Class

GregMcNeill — Mon, 02 Aug 2010 11:44:37 GMT

Drew thank you, I appreciate your help. I guess I am not understanding exactly what you are doing. I tried adding your recommendation into my Layers.mmxl and received a ERROR 1046: Type was not found or was not a compile-time constant. Then I thought that I needed to add the procedures you recommended to the Map.mxml where the service is originally called but that didn't work either. I guess I am lost here until I see an example of an <esri:ArcGISDynamicMapServiceLayer /> being accessed from separate mxml.

Re: 1119: Access of possibly undefined property reference with static type Class

DasaPaddock — Mon, 02 Aug 2010 18:40:25 GMT

Have you imported Layer?

e.g.

import com.esri.ags.layers.Layer;

Re: 1119: Access of possibly undefined property reference with static type Class

GregMcNeill — Mon, 02 Aug 2010 20:24:40 GMT

Dasa, yes I did import Layer .

I have included a copy of my files so you can see exactly what I am attempting to do. I apprecate everyone help, thanks.

Re: 1119: Access of possibly undefined property reference with static type Class

DasaPaddock — Sat, 11 Dec 2021 16:04:39 GMT

Try changing Layers.mxml to this:

    <mx:Script>
        <![CDATA[
            [Bindable]
            public var layer:Layer;
         ]]>
    </mx:Script>

    <layers:LayerTOC layer="{layer}" height="100%" width="230"/>

and adding this to the LoadLayers():

lay.layer = myDynamicService;

Table of Contents Popup

GregMcNeill — Tue, 03 Aug 2010 17:06:04 GMT

Dasa,

That did the trick! Thank you, I really appreciated your help with this issue and I would not have made work without it. I wondered if I needed to bind the service but I didn't have a clue how to go about it or if it was really what was needed. It looks like I need to study up on how an when to use binding. Again many thanks.

I have attached a copy of the working code with your recommendation in case anyone else needs help.

-Greg