Feature Layer layer as a variable

[ionarawilson1]

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: ['*']         }); 

[JasonZou · Accepted solution]

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: ['*'] });

[ionarawilson1]

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]);

[JasonZou]

var layerId = "Stewardship";

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

 var layerId = "0";

and try again.

[ionarawilson1]

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") 
   }

[JasonZou]

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");

[ionarawilson1]

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")

[JasonZou]

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");

[ionarawilson1]

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

activity.store.getValue is not a function

[JasonZou]

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

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