topic Re: Empty feature template in Silverlight app in ArcGIS API for Silverlight Questions

Empty feature template in Silverlight app

PaulHarbulak — Thu, 01 Jul 2010 20:16:52 GMT

I've developed a Silverlight web application for testing custom editing functionality and I am able to edit my feature service (which uses a feature class in PostgreSQL). However, for the life of me I can't get the default feature template to work on the feature layer. My feature layer is symbolized using a green outline symbol. When I begin drawing a new polygon it appears as a black outline but when the new polygon is completed it disappears--it doesn't have any symbology and it doesn't take the symbology of the feature layer unless I completely refresh the web app. Also, if I try adding a TemplatePicker control, the feature layer's template is blank. Any ideas on what i could be doing wrong? Thanks.

Re: Empty feature template in Silverlight app

dotMorten_esri — Thu, 01 Jul 2010 22:31:52 GMT

What version are you using? What are you using to draw and edit the feature? Does your service have a renderer defined without a default symbol, and the graphic you are adding doesn't have an attribute that matches any of the symbols defined in the renderer?
What happens if you explicitly override the renderer with your own instead of using what is coming from the server?

Re: Empty feature template in Silverlight app

PaulHarbulak — Fri, 02 Jul 2010 15:24:31 GMT

Thanks for the response! I'm using version 2.0 of the Silverlight API (with Silverlight 4). I'm doing testing with both the out-of-the-box EditorWidget control as well as a custom set of buttons with binding to Editor commands (Add, Reshape, Cut, etc.). My feature service just uses a single symbol (simple fill symbol with just an outline). However, I define a simple fill symbol in my silverlight app that I use for the Feature Layer. If I draw a new polygon it won't appear, regardless of whether or not I edit the attributes. But the new feature is in fact added to the feature class and it appears if I restart the silverlight app. I added a new template in the source feature class and just copied the default template, and it appears in an editor widget and template picker but it is also blank.

Re: Empty feature template in Silverlight app

dotMorten_esri — Fri, 02 Jul 2010 15:33:30 GMT

Could you share the layer metadata?
Ie. go to the rest endpoint for the layer, add ?f=pjson to the URL, and paste the response here. (or even better if the service is public, share the URL)

Re: Empty feature template in Silverlight app

PaulHarbulak — Fri, 02 Jul 2010 16:15:55 GMT

The services aren't public yet, but here is the json output I got:

{
"serviceDescription" : null,
"layers" : [
    {
      "id" : 0,
      "name" : "Fields"
    }
],
"tables" : [
]
}

Re: Empty feature template in Silverlight app

PaulHarbulak — Fri, 02 Jul 2010 16:17:38 GMT

Here is the metadata for the layer (which is probably what you're looking for...judging from how little info I gave you in the previous post...)

{
"id" : 0,
"name" : "Fields",
"type" : "Feature Layer",
"displayField" : "id",
"description" : "",
"copyrightText" : "",
"relationships" : [
],
"geometryType" : "esriGeometryPolygon",
"minScale" : 0,
"maxScale" : 0,
"extent" : {
    "xmin" : -10449839.8159,
    "ymin" : 5111035.6446,
    "xmax" : -10437153.7118,
    "ymax" : 5117429.5595,
    "spatialReference" : {
      "wkid" : 3857
    }
},
"drawingInfo" : {"renderer" :
    {
      "type" : "simple",
      "symbol" :
      {
        "type" : "esriSFS",
        "style" : "esriSFSSolid",

        "color" : [
          209,
          255,
          115,
          255
        ],
        "outline" :
        {
          "type" : "esriSLS",
          "style" : "esriSLSSolid",

          "color" : [
            85,
            255,
            0,
            255
          ],
          "width" : 1.5
        }
      },
      "label" : "",
      "description" : ""
    },
    "transparency" : 0,
    "labelingInfo" : null},
"hasAttachments" : false,
"htmlPopupType" : "esriServerHTMLPopupTypeAsHTMLText",
"objectIdField" : "objectid",
"globalIdField" : "",
"typeIdField" : "",
"fields" : [
    {
      "name" : "objectid",
      "type" : "esriFieldTypeOID",
      "alias" : "OBJECTID",
      "editable" : false,
      "domain" : null
    },
    {
      "name" : "id",
      "type" : "esriFieldTypeInteger",
      "alias" : "ID",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "growerid",
      "type" : "esriFieldTypeInteger",
      "alias" : "GrowerID",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "farmid",
      "type" : "esriFieldTypeInteger",
      "alias" : "FarmID",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "legal_description",
      "type" : "esriFieldTypeString",
      "alias" : "legal_description",
      "editable" : true,
      "length" : 255,
      "domain" : null
    },
    {
      "name" : "own_lease",
      "type" : "esriFieldTypeSmallInteger",
      "alias" : "owned",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "legal_acres",
      "type" : "esriFieldTypeDouble",
      "alias" : "legal_acres",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "calculated_acres",
      "type" : "esriFieldTypeDouble",
      "alias" : "calc_acres",
      "editable" : true,
      "domain" : null
    },
    {
      "name" : "system_name",
      "type" : "esriFieldTypeString",
      "alias" : "system_name",
      "editable" : true,
      "length" : 10,
      "domain" : null
    },
    {
      "name" : "user_name",
      "type" : "esriFieldTypeString",
      "alias" : "user_name",
      "editable" : true,
      "length" : 20,
      "domain" : null
    }
],
"types" : [
],
"templates" : [
    {
      "name" : "Test",
      "description" : "Default field layer symbology",
      "drawingTool" : "esriFeatureEditToolPolygon",
      "prototype" : {
        "attributes" : {
          "user_name" : null,
          "id" : 0,
          "growerid" : 0,
          "farmid" : 1,
          "system_name" : null,
          "legal_description" : null,
          "own_lease" : 0,
          "legal_acres" : null,
          "calculated_acres" : null
        }
      }
    },
    {
      "name" : "Fields",
      "description" : "",
      "drawingTool" : "esriFeatureEditToolPolygon",
      "prototype" : {
        "attributes" : {
          "user_name" : null,
          "id" : 0,
          "growerid" : 0,
          "farmid" : 0,
          "system_name" : null,
          "legal_description" : null,
          "own_lease" : 0,
          "legal_acres" : null,
          "calculated_acres" : null
        }
      }
    }
],
"capabilities" : "Query,Editing"
}

Re: Empty feature template in Silverlight app

dotMorten_esri — Sat, 03 Jul 2010 17:02:15 GMT

Hmm looks fine to me. What does your layer xaml look like?

Re: Empty feature template in Silverlight app

PaulHarbulak — Tue, 06 Jul 2010 14:01:43 GMT

Morten, this is the layer xaml:

<esri:FeatureLayer ID="Fields" FeatureSymbol="{StaticResource SelectSymbol}"
                        Url="http://vm-jupiter02/ArcGISServer/rest/services/Fields/FeatureServer/0"
                        OutFields="*"
                        DisableClientCaching="True"
                        AutoSave="False"
                        ValidateEdits="True" />

Re: Empty feature template in Silverlight app

dotMorten_esri — Tue, 06 Jul 2010 14:43:15 GMT

Don't set the FeatureSymbol property.

Re: Empty feature template in Silverlight app

PaulHarbulak — Tue, 06 Jul 2010 14:46:02 GMT

I already tried that. It uses a default symbology and selection symbol but the template is still empty. Same problem as before.

Re: Empty feature template in Silverlight app

AndrewWhite — Wed, 07 Jul 2010 16:00:15 GMT

What happens if you explicitly override the renderer with your own instead of using what is coming from the server?

SharpGIS, are you saying that I can have a FeatureLayer render using the symbology from the server? How can I do that? All I see are examples of setting the FeatureSymbol to some static xaml resource. I don't want to do that. I want to use the symbology that displays if I use a DynamicMapServiceLayer.

Re: Empty feature template in Silverlight app

dotMorten_esri — Thu, 08 Jul 2010 00:10:41 GMT

SharpGIS, are you saying that I can have a FeatureLayer render using the symbology from the server? How can I do that? All I see are examples of setting the FeatureSymbol to some static xaml resource. I don't want to do that. I want to use the symbology that displays if I use a DynamicMapServiceLayer.

If you don't set symbology and you hit ArcGIS Server 10, you will get symbology from the server and don't need to set any renderer or FeatureSymbol property. You don't really have to do anything to do that.
Are you looking at the v2.0 SDK samples, or the old v1.2? What version is your server?

Re: Empty feature template in Silverlight app

AndrewWhite — Thu, 08 Jul 2010 16:10:09 GMT

Are you looking at the v2.0 SDK samples, or the old v1.2? What version is your server?

We're using 1.2 and 9.? for our server. Thanks for your response. My research yesterday led me to look into version 10 on the server and 2.0 for silverlight to solve our problems, but I'm glad you responded to verify my findings.

Re: Empty feature template in Silverlight app

dotMorten_esri — Thu, 08 Jul 2010 22:55:10 GMT

That's weird... the rest response you shared earlier indicates that this is a 10.x server (granted the first beta of this this was named 9.4). Also ArcGIS Server 10 is required to do any form of editing, and the same goes for the Silverlight API which has to be v2.0