topic Re: Feature Layer layer as a variable in ArcGIS JavaScript Maps SDK Questions

Feature Layer layer as a variable

ionarawilson1 — Wed, 20 Nov 2013 20:27:37 GMT

Depending on what is selected on a combobox, the layer of a feature layer should change. How can I use a variable to do that?
For example, that 0 as one layer in the feature layer would be replaced by a variable, but I am not sure how to do that! Thanks

var layernumber  = 0   var stewardship = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/Stewardship_SA3/FeatureServer/0",      {           mode: FeatureLayer.MODE_SELECTION, id: 'stewardship',           outFields: ['*']         });

Re: Feature Layer layer as a variable

JasonZou — Wed, 20 Nov 2013 21:49:33 GMT

Here is the revision.

// assume cboLayer is a dijit/form/ComboBox type control var layerId = cboLayer.get("value");  // assume all the layer are coming from the same feature service. var featLayer = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/Stewardship_SA3/FeatureServer/" + layerId, {           mode: FeatureLayer.MODE_SELECTION,            id: 'stewardship_' + layerId,           outFields: ['*'] });

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:08 GMT

Hi Jason,

I tried this but it is not working. What am I doing wrong? Thanks

FeatureServiceStewAAreaAPoint (FeatureServer)
View In:   ArcGIS.com Map

View Footprint In:   ArcGIS.com Map

Service Description:

Has Versioned Data: false

Has Versioned Data: false

MaxRecordCount: 1000

Supported Query Formats: JSON, AMF

Layers:

    Stewardship (0)
    ActivityArea (1)
    ActivityPoint (2)

var layerId = "Stewardship";

// assume all the layer are coming from the same feature service.
var featLayer = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/" + layerId, {
          mode: FeatureLayer.MODE_SELECTION, 
          id: 'stewardship_' + layerId,
          outFields: ['*']
});
  
   

   map.addLayers([stewardship_Stewardship]);

Re: Feature Layer layer as a variable

JasonZou — Thu, 21 Nov 2013 14:57:04 GMT

var layerId = "Stewardship";

layerId must be a number, not a text string. Change it to

 var layerId = "0";

and try again.

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:11 GMT

It worked! Thank you so much. The only issue now is to get the value from the combobox to pass that value to the layerID variable. My values are strings. Is there a way to create another property in the combobox and get that value, that would be a number, to use as the layerID value? Here is the code snippet of the functionality of my comboboxes. Thanks!!!

dataArray = [
            {name:"Forest Stewardship Plan", id:"0"},
   {name:"Non Forest Stewardship Plan", id:"1"},
            {name:"Reforestation Acres - TFS", id:"F-R-TFS"},
            {name:"Reforestation Acres - Non TFS", id:"F-R-O"},
            {name:"Reforestation Assist", id:"F-R-A"},
            {name:"Tree Farm Program Inspection - Inspection", id:"F-TFP-I"},
            {name:"Tree Farm Program Inspection - Reinspection", id:"F-TFP-R"},
            {name:"Certified Forest Steward Assist", id:"F-CFS-A"},
            {name:"Timber Theft Damage Appraisal", id:"F-TTDA"},
            {name:"Referral - Consulting Forester", id:"F-R-CF"},
            {name:"Referral - Vendor", id:"F-R-V"},
            {name:"Rural Forestry Incidental Assist", id:"F-IA"},
   {name:"Prevention and Reduction of Pest Losses", id:"F-PRPL"},
   {name:"Forest Health Monitoring", id:"F-FHM"},
   {name:"FIA Assist", id:"F-IA-A"},
   {name:"BMP Assist", id:"F-BMP-A"},
   {name:"OW On-Site Assist", id:"OW-OSA"},
   {name:"OW Not On Site Assist", id:"OW-NOSA"},
   {name:"OW Incidental Assist", id:"OW-IA"},
   {name:"OW Presentation", id:"OW-P"},
   {name:"OW Training Given", id:"OW-TG"},
   {name:"OW Training Received", id:"OW-TR"},
   {name:"UF Individual Assist", id:"UF-A"},
   {name:"UF Governmental Organization Assist", id:"UF-GO-A"},
   {name:"NGO Assist", id:"UF-NGO-A"},
   {name:"Tree City USA Assist", id:"UF-TC"},
   {name:"Arbor Day Program", id:"UF-ADP"},
   {name:"UF Training Given", id:"UF-TG"},
   {name:"UF Training Received", id:"UF-TR"},
   {name:"UF Incidental Assist", id:"UF-IA"},
   {name:"UF Presentation", id:"UF-P"},
   {name:"Referral - Arborist", id:"UF-R-A"},
   {name:"VFD and/or ESD Assist", id:"Fi-VFD-A"},
   {name:"Community Wildfire Protection Plan", id:"Fi-CWPP"},
   {name:"Firewise Communities USA", id:"Fi-FC"},
   {name:"FEPP Support and Assistance", id:"Fi-FEPP"},
   {name:"Fire Prevention", id:"Fi-Pr"},
   {name:"District Fire Work Plans and County Profiles", id:"Fi-Pl"},
   {name:"Fire and Emergency Training Given", id:"Fi-TG"},
   {name:"Resource Protection Technical Development", id:"Fi-TR"},
   {name:"Landowner Workshops", id:"CE-LW"},
   {name:"Emerging Communities", id:"CE-EC"},
   {name:"Landowner Association Assist", id:"CE-LA"},
   {name:"Forest Awareness, Walk in the Forest, PLT Programs", id:"CE-PLT"},
   {name:"Forest Awareness, Walk in the Forest, PLT Programs - Assist", id:"CE-PLT-A"},
   {name:"ConEd Program, Woodland Clinic, Environthon, etc.", id:"CE-ConEd"},
   {name:"ConEd Presentation - Civic Organization", id:"CE-PCO"},
   {name:"Professional Development - Training Received", id:"PD-TR"},
   {name:"Professional Development - Internal Training Given", id:"PD-TG"},
   {name:"Meeting Attended", id:"PD-MAT"},
   {name:"Professional Networking", id:"PD-PDN"},
   {name:"Media Contact - Rural Forestry", id:"M-MC-R"},
   {name:"Media Contact - Urban Forestry", id:"M-MC-U"},
   {name:"Media Contact - Oak Wilt", id:"M-MC-OW"},
        ]
  
  dataArrayForestry = [
            {name:"Forest Stewardship Plan", id:"F-FSP"},
   {name:"Non Forest Stewardship Plan", id:"F-NFSP"},
            {name:"Reforestation Acres - TFS", id:"F-R-TFS"},
            {name:"Reforestation Acres - Non TFS", id:"F-R-O"},
            {name:"Reforestation Assist", id:"F-R-A"},
            {name:"Tree Farm Program Inspection - Inspection", id:"F-TFP-I"},
            {name:"Tree Farm Program Inspection - Reinspection", id:"F-TFP-R"},
            {name:"Certified Forest Steward Assist", id:"F-CFS-A"},
            {name:"Timber Theft Damage Appraisal", id:"F-TTDA"},
            {name:"Referral - Consulting Forester", id:"F-R-CF"},
            {name:"Referral - Vendor", id:"F-R-V"},
            {name:"Rural Forestry Incidental Assist", id:"F-IA"},
   {name:"Prevention and Reduction of Pest Losses", id:"F-PRPL"},
   {name:"Forest Health Monitoring", id:"F-FHM"},
   {name:"FIA Assist", id:"F-IA-A"},
   {name:"BMP Assist", id:"F-BMP-A"},
   
        ]
  
  dataArrayOakWilt = [
            {name:"OW On-Site Assist", id:"OW-OSA"},
   {name:"OW Not On Site Assist", id:"OW-NOSA"},
   {name:"OW Incidental Assist", id:"OW-IA"},
   {name:"OW Presentation", id:"OW-P"},
   {name:"OW Training Given", id:"OW-TG"},
   {name:"OW Training Received", id:"OW-TR"},
   {name:"Alpine", id:"AL"},
        ]
  
  dataArrayUrbanForestry = [
            {name:"UF Individual Assist", id:"UF-A"},
   {name:"UF Governmental Organization Assist", id:"UF-GO-A"},
   {name:"NGO Assist", id:"UF-NGO-A"},
   {name:"Tree City USA Assist", id:"UF-TC"},
   {name:"Arbor Day Program", id:"UF-ADP"},
   {name:"UF Training Given", id:"UF-TG"},
   {name:"UF Training Received", id:"UF-TR"},
   {name:"UF Incidental Assist", id:"UF-IA"},
   {name:"UF Presentation", id:"UF-P"},
   {name:"Referral - Arborist", id:"UF-R-A"},
  
        ]
  
  dataArrayConservationEducation = [
            {name:"Landowner Workshops", id:"CE-LW"},
   {name:"Emerging Communities", id:"CE-EC"},
   {name:"Landowner Association Assist", id:"CE-LA"},
   {name:"Forest Awareness, Walk in the Forest, PLT Programs", id:"CE-PLT"},
   {name:"Forest Awareness, Walk in the Forest, PLT Programs - Assist", id:"CE-PLT-A"},
   {name:"ConEd Program, Woodland Clinic, Environthon, etc.", id:"CE-ConEd"},
   {name:"ConEd Presentation - Civic Organization", id:"CE-PCO"},
   
  
        ]
  
  
  dataArrayFire = [
            {name:"VFD and/or ESD Assist", id:"Fi-VFD-A"},
   {name:"Community Wildfire Protection Plan", id:"Fi-CWPP"},
   {name:"Firewise Communities USA", id:"Fi-FC"},
   {name:"FEPP Support and Assistance", id:"Fi-FEPP"},
   {name:"Fire Prevention", id:"Fi-Pr"},
   {name:"District Fire Work Plans and County Profiles", id:"Fi-Pl"},
   {name:"Fire and Emergency Training Given", id:"Fi-TG"},
   {name:"Resource Protection Technical Development", id:"Fi-TR"},
   
  
        ]
  
  
  dataArrayProfessionalDevelopment = [
            {name:"Professional Development - Training Received", id:"PD-TR"},
   {name:"Professional Development - Internal Training Given", id:"PD-TG"},
   {name:"Meeting Attended", id:"PD-MAT"},
   {name:"Professional Networking", id:"PD-PDN"},
     
  
        ]
  
  
  dataArrayMedia = [
            {name:"Media Contact - Rural Forestry", id:"M-MC-R"},
   {name:"Media Contact - Urban Forestry", id:"M-MC-U"},
   {name:"Media Contact - Oak Wilt", id:"M-MC-OW"},
    
        ]
      var stateStore = new Memory({
    
        data: [
            {name:"Forestry", id:"FO"},
   {name:"Oak Wilt", id:"OW"},
            {name:"Urban Forestry", id:"UF"},
            {name:"Fire", id:"Fi"},
            {name:"Conservation Education", id:"CE"},
            {name:"Professional Development", id:"PD"},
            {name:"Media", id:"ME"},
          
        ]
    });

    var comboBox = new ComboBox({
        id: "ActivityGroup",
        name: "ActivityGroup",
        value: " ",
        store: stateStore,
  intermediateChanges: true,
        searchAttr: "name"
  
    }, "GroupActivity");

        
   var stateStore2 = new Memory({
    
        data: dataArray
    });

    var comboBox = new ComboBox({
        id: "Activity",
        name: "activity",
        value: " ",
  intermediateChanges: true,
        store: stateStore2,
        searchAttr: "name"
    }, "Activity");

    dojo.connect(dijit.byId("ActivityGroup"), 'onChange', function(value){ 
            // alert('ok ' + event);
    if (value == "Forestry") {
    
    stateStore2.data = dataArrayForestry
    activity = dijit.byId('Activity')
    activity.set("value", "Forest Stewardship Plan") 
   }
   
   else if (value == "Oak Wilt") {
   
     stateStore2.data = dataArrayOakWilt
    activity = dijit.byId('Activity')
    activity.set("value", "OW On-Site Assist") 
   }
   
   else if (value == "Urban Forestry") {
   
     stateStore2.data = dataArrayUrbanForestry
    activity = dijit.byId('Activity')
    activity.set("value", "UF Individual Assist") 
   }
   
   else if (value == "Conservation Education") {
   
     stateStore2.data = dataArrayConservationEducation
     activity = dijit.byId('Activity')
        activity.set("value", "Landowner Workshops") 
   }
   else if (value == "Fire") {
   
     stateStore2.data = dataArrayFire
     activity = dijit.byId('Activity')
        activity.set("value", "VFD and/or ESD Assist") 
   }

Re: Feature Layer layer as a variable

JasonZou — Fri, 10 Dec 2021 20:34:14 GMT

Add one property to each data array, like

dataArray = [
        {name:"Forest Stewardship Plan", id:"0", layerId: 0},
 {name:"Non Forest Stewardship Plan", id:"1", layerId: 1},
        ...
];

Then assume cboLayers is the combobox that built with a store using dataArray.

var layerId = store.getValue(cboLayers.item, "layerId");

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:16 GMT

I am getting close. What would be the cboLayers? In my case I am not sure . I tried this, but iI get an error, saying "store is not defined"

var layerId =  store.getValue(ActivityGroup.item, "layerID")

Re: Feature Layer layer as a variable

JasonZou — Fri, 10 Dec 2021 20:34:19 GMT

The code snippet in my previous post just gives some idea how to get the layer id from the combobox. Ok, in your case, I assume all dataArrayXXXX are the data hosting the layer info. If that is the case, after adding layerId property to each dataArrayXXXX array, then

activity = dijit.byId('Activity');
var layerId = activity.store.getValue(activity.item, "layerId");

Re: Feature Layer layer as a variable

ionarawilson1 — Thu, 21 Nov 2013 17:20:10 GMT

That should work but I get an error. Do you have any idea why?

activity.store.getValue is not a function

Re: Feature Layer layer as a variable

JasonZou — Thu, 21 Nov 2013 17:25:13 GMT

My fault. activity.item is the current selected item that should have everything you need. Try

var layerId = activity.item["layerId"];

Re: Feature Layer layer as a variable

ionarawilson1 — Thu, 21 Nov 2013 18:42:15 GMT

Now the error is:

activity.item is null

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:22 GMT

I put the code snippet inside the change function and it is not null anymore, I can see the value in the console, but since the feature layer is being created outside the change function, it does not update the layer. If I create the feature layer inside the change function, other functions will not be able to access it. How can I make it update the layer? thank you so much for your help!!!

dojo.connect(dijit.byId("Activity"), 'onChange', function(value){ 
             //alert('ok ' + event);
    activity = dijit.byId('Activity');
           var layerId = activity.item["layerId"]

            console.log(layerId)
   activityGroupValue = dijit.byId('ActivityGroup').get('value')
   
   if (activityGroupValue == " " && value in oc(forestrylist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Forestry")
    
   }
   
   else if (activityGroupValue == " " && value in oc(medialist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Media")
    
   }
   else if (activityGroupValue == " " && value in oc(conservationeducationlist))
   {
    
    dijit.byId('ActivityGroup').set('value', "Conservation Education")
    
   }
   
   else if  (activityGroupValue == " " && value in oc(firelist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Fire")
    
   }
   
   
   else if (activityGroupValue == " " && value in oc(urbanforestrylist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Urban Forestry")
    
   }


   else if  (activityGroupValue == " " && value in oc(professionaldevelopmentlist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Professional Development")
    
   }
   
   else if (activityGroupValue == " " && value in oc(oakwiltlist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Oak Wilt")
    
   }
   else if (value == "Forest Stewardship Plan") {
   
     x = 0
   }
 });
   
    
var stewardship = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/" + layerId, {
          mode: FeatureLayer.MODE_SELECTION, 
          id: 'stewardship_' + layerId,
          outFields: ['*']
});
  
   

   map.addLayers([stewardship]);

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:25 GMT

I created a global variable for stewardship, and also used that variable inside the change function. I can see in the console that the layer id changes inside the function, but the layer in the map does not change, because it is still looking at the global variable value. Any ideas on what to do ? Thank you!!

   
 var stewardship = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/0" , {
          mode: FeatureLayer.MODE_SELECTION, 
         
          outFields: ['*']
});
  
 map.addLayers([stewardship]);

   dojo.connect(dijit.byId("Activity"), 'onChange', function(value){ 
             //alert('ok ' + event);
    activity = dijit.byId('Activity');
           var layerId = activity.item["layerId"]

            console.log(layerId)
   activityGroupValue = dijit.byId('ActivityGroup').get('value')
   
   if (activityGroupValue == " " && value in oc(forestrylist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Forestry")
    
   }
   
   else if (activityGroupValue == " " && value in oc(medialist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Media")
    
   }
   else if (activityGroupValue == " " && value in oc(conservationeducationlist))
   {
    
    dijit.byId('ActivityGroup').set('value', "Conservation Education")
    
   }
   
   else if  (activityGroupValue == " " && value in oc(firelist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Fire")
    
   }
   
   
   else if (activityGroupValue == " " && value in oc(urbanforestrylist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Urban Forestry")
    
   }


   else if  (activityGroupValue == " " && value in oc(professionaldevelopmentlist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Professional Development")
    
   }
   
   else if (activityGroupValue == " " && value in oc(oakwiltlist))
   {
   
    dijit.byId('ActivityGroup').set('value', "Oak Wilt")
    
   }
  
       
stewardship = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/" + layerId, {
          mode: FeatureLayer.MODE_SELECTION, 
          id: 'stewardship_' + layerId,
          outFields: ['*']
    
});
  
   

   map.addLayers([stewardship]);
   console.log(stewardship)

Re: Feature Layer layer as a variable

JasonZou — Fri, 10 Dec 2021 20:34:27 GMT

What you can do is to declare a module or global level variable, which will be a key-value hash object. Here is the concept-proof code.

var loadedFeatLayers = {};

dojo.connect(dijit.byId("Activity"), 'onChange', function(value){ 
    activity = dijit.byId('Activity');
    var layerId = activity.item["layerId"];    // item["layerId"] may be an array; if so, use item["layerId"][0]
    var layer = loadedFeatLayers[layerId];

    // if the feature layer not created, create it.
    if (!layer) {
        loadedFeatLayers[layerId] = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/" + layerId, {
          mode: FeatureLayer.MODE_SELECTION, 
          id: 'stewardship_' + layerId,
          outFields: ['*']
        });

        map.addLayer(loadedFeatLayers[layerId]);
    }
    // if loaded, make it visible if not visible
    else {
        if (!layer.visible) layer.setVisibility(true);
    }
});

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 10 Dec 2021 20:34:30 GMT

I used your code and I can see the value changing on the console, but nothing happens on the application. I actually need the layer to change in the editor template (I am using the editor widget), but the editor is not adding any layers when using this method. Here is the snippet with your added code.

var loadedFeatLayers = {};
dojo.connect(dijit.byId("Activity"), 'onChange', function(value){ 
             //alert('ok ' + event);
    //remove the existing stewardship layer
  
      activity = dijit.byId('Activity');
   var layerId = activity.item["layerId"];    // item["layerId"] may be an array; if so, use item["layerId"][0]
   var layer = loadedFeatLayers[layerId];
  if (!layer) {
        loadedFeatLayers[layerId] = new FeatureLayer("http://tfsgis-iisd01:6080/arcgis/rest/services/FeatureServiceStewAAreaAPoint/FeatureServer/" + layerId, {
          mode: FeatureLayer.MODE_SELECTION, 
          id: 'stewardship_' + layerId,
          outFields: ['*']
        });
        alert("TEST1")
        map.addLayer(loadedFeatLayers[layerId]);
  console.log(loadedFeatLayers[layerId])
  }
    // if loaded, make it visible if not visible
     else {
  alert("TEST2")
        if (!layer.visible) {
   layer.setVisibility(true);
  }
    }

And here are the code snippets that are creating the editor:

map.on("layers-add-result", initEditor);
 function initEditor(evt) {
 
          var templateLayers = arrayUtils.map(evt.layers, function(result){
            return result.layer;
 

          });


 var templatePicker = new TemplatePicker({
            featureLayers: templateLayers,
            grouping: true,
            rows: "auto",
            columns: 3
          }, "templateDiv");
          templatePicker.startup();

          var layers = arrayUtils.map(evt.layers, function(result) {
     


 var settings = {
            map: map,
            templatePicker: templatePicker,
            layerInfos: layers,
            toolbarVisible: true,
            createOptions: {
              polylineDrawTools:[ Editor.CREATE_TOOL_FREEHAND_POLYLINE ],
              polygonDrawTools: [ Editor.CREATE_TOOL_FREEHAND_POLYGON,
                Editor.CREATE_TOOL_CIRCLE,
                Editor.CREATE_TOOL_TRIANGLE,
                Editor.CREATE_TOOL_RECTANGLE
              ]
            },
            toolbarOptions: {
              reshapeVisible: true,
     mergeVisible: true,
     cutVisible: true
     
     
     
            }
     
          };

          var params = {settings: settings};    
          var myEditor = new Editor(params,'editorDiv');
          //define snapping options
          var symbol = new SimpleMarkerSymbol(
            SimpleMarkerSymbol.STYLE_CROSS, 
            15, 
            new SimpleLineSymbol(
              SimpleLineSymbol.STYLE_SOLID, 
              new Color([255, 0, 0, 0.5]), 
              5
            ), 
            null
          );
          map.enableSnapping({
            snapPointSymbol: symbol,
            tolerance: 20,
            snapKey: keys.ALT
          });

Re: Feature Layer layer as a variable

ionarawilson1 — Fri, 22 Nov 2013 18:26:23 GMT

The problem is that the layer is not being added to the map. When I click on the url on the console I can see this:

__proto__
Object { declaredClass="esri.layers.FeatureLayer", invalidParams="query contains one or more unsupported parameters", _eventMap={...}, more...}

Wouldn't be a problem with the id perhaps? Why do I make it equal to 'stewardship_' + layerId?

Here is a code snippet with part of the data so you can see I am setting the layerId as number

items: [
            {name:"Forest Stewardship Plan", id:0, layerId:0},
   {name:"Non Forest Stewardship Plan", id:1, layerId:1},
            {name:"Reforestation Acres - TFS", id:2, layerId:2},
            {name:"Reforestation Acres - Non TFS", id:3, layerId:1},
            {name:"Reforestation Assist", id:4, layerId:0},
            {name:"Tree Farm Program Inspection - Inspection", id:5, layerId:1},
            {name:"Tree Farm Program Inspection - Reinspection", id:6, layerId:2},
            {name:"Certified Forest Steward Assist", id:7, layerId:1},
            {name:"Timber Theft Damage Appraisal", id:8, layerId:0},
            {name:"Referral - Consulting Forester", id:9, layerId:1},
            {name:"Referral - Vendor", id:10, layerId:2},
            {name:"Rural Forestry Incidental Assist", id:13, layerId:1},
   {name:"Prevention and Reduction of Pest Losses", id:12, layerId:0},
   {name:"Forest Health Monitoring", id:13, layerId:1},
   {name:"FIA Assist", id:14, layerId:2},
   {name:"BMP Assist", id:15, layerId:1},
   {name:"OW On-Site Assist", id:16, layerId:2},
   {name:"OW Not On Site Assist", id:17, layerId:2},
   {name:"OW Incidental Assist", id:18, layerId:2},
   {name:"OW Presentation", id:19, layerId:2},
   {name:"OW Training Given", id:20, layerId:2},
   {name:"OW Training Received", id:21, layerId:2},

However, the items on this combobox get filtered based on another combobox . I noticed that if Forestry (first item in this combobox), gets selected first, then I don't see an error (but still dont see the layer appearing on the map or in the editor template), but I choose another selection, then I get

TypeError: activity.item is null
I am not sure why I see this error.

Here are the contents of the combobox that filters the other combobox, which is used to select the layer
      var stateStore = new Memory({

        data: [
            {name:"Forestry", id:"FO", layerId:1},
   {name:"Oak Wilt", id:"OW", layerId:1},
            {name:"Urban Forestry", id:"UF", layerId:1},
            {name:"Fire", id:"Fi", layerId:1},
            {name:"Conservation Education", id:"CE", layerId:1},
            {name:"Professional Development", id:"PD", layerId:1},
            {name:"Media", id:"ME", layerId:1}

        ]
    });