Latest Contributions by TomWang

Hi, Is it possible to generate a 5 classbreak quantile render for a QueryDataSource dynamicLayer/featurelayer? For example, a featurelayer is: var featureLayer = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/dynamicLayer", {           mode: FeatureLayer.MODE_ONDEMAND,           outFields: ["*"],           infoTemplate: infoTemplate,           source: layerSource         }); How to create a render with a classDef: var classDef = new ClassBreaksDefinition();           classDef.classificationField = app.currentAttribute;           classDef.classificationMethod = "quantile";           classDef.breakCount = 5;           classDef.baseSymbol = app.sfs; ... View more

Hi, In Silverlight API, there is esri:GroupLayer in esri:Map control. How about JavaScript API? I did not find this esri:GroupLayer control? Please advice! Thanks, Tom ... View more

Hi, It would be great if someone could share your experiences to custom legend or to set a template for legend in JavaScript? In Silverlight API legend control, there are two templates I have used to custom my legend Legend.LegendItemTemplate and LayerItemViewModel.Template. Thanks, Tom ... View more

Hi, I would like to use QueryDataSource. Two options I have are to map a query: "esri/layers/ArcGISDynamicMapServiceLayer" or "esri/layers/FeatureLayer'. Which one has better performance if i have about 4000 polygons?  "esri/layers/ArcGISDynamicMapServiceLayer" or "esri/layers/FeatureLayer (with MODE_ONDEMAND)"? Thanks, Tom ... View more

Hi, I am using a Buffer tool of "http://myserver/arcgis/rest/services/Utilities/Geometry/GeometryServer" in my project. I got error message "Unable to complete operation".   - {Error code '400': 'Unable to complete operation.'Wrong unit type (expected linear unit, got angular unit, or vice versa)} But it works fine if to use http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer instead. Also, my geometry service works fine when to use Simplify, Relation, Union. only the Buffer dose not work. Please advice! Thanks, Tom ... View more

Hi, I have tried VB sample code on esri site. it is not working. Please advise! <Grid x:Name="LayoutRoot">     <!-- Add a Map Control. Zoom to the East-Central United States. -->   <esri:Map Background="White" HorizontalAlignment="Left" Margin="0,204,0,0" Name="Map1"           VerticalAlignment="Top" Height="350" Width="500" Extent="-10349730,3871622,-8642421,5066738">       <!--Add an ArcGISTiledMapServiceLayer as a backdrop. It has uses SpatialReference WKID=102100 (3857). -->     <esri:ArcGISTiledMapServiceLayer ID="myArcGISTiledMapServiceLayer"       Url="http://services.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer" />     </esri:Map>     <!-- Button to add a Dynamic Layer (using QueryDataSource) via code-behind. -->   <Button Content="Add a QueryDataSource based Dynamic Layer" Height="23"           HorizontalAlignment="Left" Margin="0,175,0,0" Name="Button1" VerticalAlignment="Top" Width="500"           Click="Button1_Click"/>     <!-- Provide the instructions on how to use the sample code. -->   <TextBlock Height="145" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="788"     TextWrapping="Wrap" Text="Click the button to add a Dynamic Layer (the state of Kentucky) via code-behind using     a QueryDataSource. The Dynamic Layers used in this example code are based upon using a LayerDataSource that     is undiscoverable via the public ArcGIS Server Directory REST pages. The 'WorkspaceID' and 'DataSourceName'     for each Dynamic Layer must be provided to the developer by Manager/Adminstrator of the     ArcGISDynamicMapServiceLayer. Examples of the 'WorkspaceID' and 'DataSourceName' are provided as comments in     code-behind for a public ArcGIS Server that has Dynamic Layers enabled via the LayerDataSource object."/>   </Grid> Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)     ' Add a Layer on-the-fly based on an ArcGISDynamicMapServiceLayer that has Dynamic Layer capabalities enabled.   ' The Layer being added DOES NOT come from an existing sub-layer in a LayerMapSource. Rather the Dynamic Layer   ' is being generated uses the 'Workspace Type' of 'Database' via the LayerDataSource object. Review the   ' ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer Class documentation in the API reference for a full discussion.   ' In order to create this Dynamic Layer, information was shared between the Manager/Admininstrator of the   ' ArcGISDynamicMapServiceLayer ArcGIS Server service and the application developer.   '   ' The Url for the ArcGISDynamicMapServiceLayer is: "http://servicesbeta2.esri.com/arcgis/rest/services/USA/MapServer".   '   ' The WorkspaceID used in the LayerDataSource for the Dynamic Layer is: "MyDatabaseWorkspaceIDSSR2"   '   ' There are several DataSourceName types associated with the WorkspaceID that could be used to create the Rendering   ' of a Dynamic Layer. Think of the DataSourceName as the string name of the layer that will be drawn dynamically.   ' A listing of the available DataSourceNames (and their geometry type) are:   ' "Demo.DBO.USAreaCodes" <== Polygons   ' "Demo.DBO.USCities" <== Points   ' "Demo.DBO.USCounties" <== Polygons   ' "Demo.DBO.USHighways" <== Polylines   ' "Demo.DBO.USLakes" <== Polygons   ' "Demo.DBO.USPlaces" <== Points     ' "Demo.DBO.USRailroads" <== Polylines   ' "Demo.DBO.USRivers" <== Polylines   ' "Demo.DBO.USStates" <== Polygons     ' Create a QueryDataSource object and set all of it's Properties to valid values.   Dim myQueryDataSource As New ESRI.ArcGIS.Client.QueryDataSource   myQueryDataSource.GeometryType = ESRI.ArcGIS.Client.Tasks.GeometryType.Polygon   Dim myOIDFields As String() = {"OBJECTID"}   myQueryDataSource.OIDFields = myOIDFields   myQueryDataSource.Query = "SELECT * FROM Demo.DBO.USStates where STATE_NAME = 'Kentucky'"   Dim mySpatialReference As New ESRI.ArcGIS.Client.Geometry.SpatialReference(4326)   myQueryDataSource.SpatialReference = mySpatialReference   myQueryDataSource.WorkspaceID = "MyDatabaseWorkspaceIDSSR2"     ' Create a new LayerDataSource and set its DataSource Property to the QueryDataSource.   Dim myLayerDataSource As New ESRI.ArcGIS.Client.LayerDataSource   myLayerDataSource.DataSource = myQueryDataSource     ' Create a new DynamicLayerInfo object and set its ID and Source Properties.   Dim myDynamicLayerInfo As New ESRI.ArcGIS.Client.DynamicLayerInfo   myDynamicLayerInfo.ID = 102 ' Must be the same as the LayerDrawingOptions.LayerID   myDynamicLayerInfo.Source = myLayerDataSource     ' Create a new DynamicLayerInfoCollection and add the DynamicLayerInfo object into it.   Dim myDynamicLayerInfoCollection As New ESRI.ArcGIS.Client.DynamicLayerInfoCollection   myDynamicLayerInfoCollection.Add(myDynamicLayerInfo)     ' Create a SimpleFillSymbol (Green Fill, with Black Border, and BorderThickness of 2).   Dim mySimpleFillSymbol As New ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol   mySimpleFillSymbol.Fill = New System.Windows.Media.SolidColorBrush(Colors.Green)   mySimpleFillSymbol.BorderThickness = 2   mySimpleFillSymbol.BorderBrush = New System.Windows.Media.SolidColorBrush(Colors.Black)     ' Create a new SimpleRenderer based upon the SimpleFillSymbol.   Dim mySimpleRenderer As New ESRI.ArcGIS.Client.SimpleRenderer   mySimpleRenderer.Symbol = mySimpleFillSymbol     ' Create a new LayerDrawingOptions object which is key to applying our custom Rendering of the Dynamic Layer.   ' It is imperative that the LayerDrawingOptions.LayerID = DynamicLayerInfo.ID so that the Dynamic Layer draws   ' using the new symbology.   Dim myLayerDrawingOptions As New ESRI.ArcGIS.Client.LayerDrawingOptions   myLayerDrawingOptions.LayerID = 102 ' Must be the same as the DynammicLayerInfo.ID   myLayerDrawingOptions.Renderer = mySimpleRenderer     ' Create a new LayerDrawinOptionsCollection and add the LayerDraingOptions object into it.   Dim myLayerDrawingOptionsCollection As New ESRI.ArcGIS.Client.LayerDrawingOptionsCollection   myLayerDrawingOptionsCollection.Add(myLayerDrawingOptions)     ' Create a new Dynamic Layer that is based upon on a LayerDataSource of an ArcGISDynamicMapServiceLayer   ' and apply it's custom rendering.   Dim myArcGISDynamicMapServiceLayer As New ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer   myArcGISDynamicMapServiceLayer.Url = "http://servicesbeta2.esri.com/arcgis/rest/services/USA/MapServer"   myArcGISDynamicMapServiceLayer.DisableClientCaching = True   myArcGISDynamicMapServiceLayer.DynamicLayerInfos = myDynamicLayerInfoCollection   myArcGISDynamicMapServiceLayer.LayerDrawingOptions = myLayerDrawingOptionsCollection     ' Add the Dynamic Layer to the Map Control. This causes the round trip server request to occur.   Map1.Layers.Add(myArcGISDynamicMapServiceLayer)   End Sub ... View more

Hi, I have some basic question about this new dynamic layer. I am working on a sample code of QueryDataSource from ArcGIS API for Silverlight. It seems ok but i could not see data being drawn on my map. I guess my first question is this "myDynamicLayerInfo.ID = 102". It could be any number, it would work if it is same as the LayerDrawingOptions.LayerID. But if id is already existing in the map service, it will replace the old layer. My second question is where all this dynamic layer saved once being added into the map service. Please advice why the data is not being drawn on the map. BTW, it is in my legend. ... View more

I need to identify like say "My Favorite City". For example, there are three Class Breaks based on "POP1990". There is another field in City Feature Class" called "City Type". If City Type is "FavoriteCity", I'd like to add a new symbol but still keep "MySmallMarkerSymbol", "MyMediumMarkerSymbol" and "MyLargeMarkerSymbol". I have tried to add a graphic layer but I can't find an event to listen when this cluster rendering finished. ... View more

Hi, I googled around and found this post from http://geo.geek.nz/development/whats-new-in-the-updated-arcgis-api-for-microsoft-silverlight-wpf/ "Resolved bugs: Large requests by tasks are failing. If a task creates a Web request with greater than 2048 characters in the URI, the task will use POST (instead of GET) to submit the request." I have a client who is working with the Silverlight API 2.2 and ArcGIS Server 10 SP2.  They are running into an problem wherein their application seems to be making GET HTTP requests to ArcGIS Server that exceed the maximum URI length of 2048 characters.  When this happens this leads to errors in the application, and then the map vanishes from the viewer menu. Any idea? Thanks ... View more

I need to create a  Historical Aerial Imagery tool that a user moves the imagery slider to the left to view ???older??? aerial images and to the right to view more recent aerial images. To implement this task, I can think two options ??? one is to use esri:TimeSlider with ArcGISImageServiceLayer and another way is to build a slider tool to add/remove ArcGISTiledMapServiceLayer. I am not comfortable to use ArcGISDynamicMapServiceLayer or FeatureLayer. Due to the size of the aerial imagery files, it is expected that users will experience a delay when loading the aerial imagery into the Web Application. Performance will be managed by loading all aerial imagery required for the Historical Aerial Imagery tool when the tool is launched. Any ideas would great appreciated. ... View more

I am implementing a simple query task. I would like to display domains instead of values. In flex API, there is 1. Get the layer???s details 2. Get the fields from the layer details 3. Get the domain from the field Is there same methods in Silverlight? ... View more