topic Re: SpatialQueryAction & dataGrid in ArcGIS API for Silverlight Questions

SpatialQueryAction & dataGrid

MiriEshel — Thu, 21 Jun 2012 12:58:19 GMT

Hi,

Is there a way to show a DataGrid of the selected features using SpatialQueryAction.

There is a sample called: http://resourcesbeta.arcgis.com/en/help/silverlight-api/samples/start.htm#GraphicsActions
I want to extend this sample to show also the dataGrid of the selection's result.

Thanks a lot,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Sun, 12 Dec 2021 03:21:31 GMT

Hi,

Is there a way to show a DataGrid of the selected features using SpatialQueryAction.

There is a sample called: http://resourcesbeta.arcgis.com/en/help/silverlight-api/samples/start.htm#GraphicsActions
I want to extend this sample to show also the dataGrid of the selection's result.

Thanks a lot,
Miri

Have you looked at the FeatureDataGrid sample http://resourcesbeta.arcgis.com/en/help/silverlight-api/samples/start.htm#FeatureDataGrid?

With the SpatialQueryAction you are passing in the LayerId of the graphics layer that you want the results to be displayed on. I think that if you bind a FeatureDataGrid to that Graphics layer it should display the results like you want (disclaimer: I have not tried this yet :))


        <esri:FeatureDataGrid Grid.Row="2" x:Name="MyDataGrid" Map="{Binding ElementName=MyMap}"
                GraphicsLayer="{Binding ElementName=MyMap, Path=Layers[LayerIDPassedToAction]}" />

Good Luck

Re: SpatialQueryAction & dataGrid

MiriEshel — Fri, 22 Jun 2012 19:02:41 GMT

Hi Joe,

It looks promising. I will try it soon and let you know.

Thanks a lot,
Miri

Re: SpatialQueryAction & dataGrid

MiriEshel — Tue, 26 Jun 2012 11:59:32 GMT

Hi Joe,

Thanks. it works. So nice and simple to developers that are familiar with the code...

Anyway...Now I have two other questions regarding SpatialQueryAction:
1. I try to set the Url of the SpatialQueryAction by binding it to an object that I defined: _ActiveLayer.URL.
Here is the code:
                   <Button Content="Spatial Query" Name="selRectangle" >
                                    <i:Interaction.Triggers>
                                        <i:EventTrigger EventName="Click">
                                              <esri:SpatialQueryAction
                                    DrawMode="Rectangle"
                                    LayerID="MyQueryResultsGraphicsLayer"
                                    Symbol="{StaticResource DefaultLineSymbol}"
                                    TargetName="Map" />
                                            <actions:SetLayerUrlAction Url="{Binding _ActiveLayer.URL}"/>
                                        </i:EventTrigger>
                                    </i:Interaction.Triggers>
                                </Button>

It gives me the error attached although I check _ActiveLayer.URL and it has a good value.
I need also to take care of cases that _ActiveLayer.URL is null and give a message in that case.

2. I have a toolbar where I keep always the selected tool. After using the SpatialQueryAction, I don't know how to restore the selected tool that was used before SpatialQueryAction. It always give me Pan functionality after using SpatialQueryAction. Is there a way to run a chunk of code after the operation is finished?
I can use the queryTask but I think it's less elegant than SpatialQueryAction.

Thanks so much, I really appreciate it.

Thanks again,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Tue, 26 Jun 2012 13:42:14 GMT

Miri,

I think you forgot to attach the error message :eek:

As for question 2, from what I can see (thanks to .net reflecter) all the Action does is populate the Graphics layer in the ExecuteComplete handler of the QueryTask. It does not seem to throw off any other notification. I think you are probably just as well off doing your own Query, you could even write it as a TriggerAction that fires an event on completion.

As strange as this sounds, in many ways I think they most complicated aspect to writing a large application with an ESRI Web Client API (flex also) is handling interactions of tools and buttons with features and the map. I have spent considerable amounts of time developing infrastructure that manages this interaction with notifications between tools so everything knows how the next mouse click should be handled.

In this case one quick and dirty way (as opposed to simple and elegant ;)) might be to add a CollectionChanged handler to your GraphicsLayer:Graphics collection. So when the points are added to the GraphicsLayer as a result of the query you will catch it and can flip the tool back on. Of course if the query returns nada well then.....?

Good luck
-Joe

Re: SpatialQueryAction & dataGrid

MiriEshel — Tue, 26 Jun 2012 17:51:09 GMT

Hi Joe,

Thank you for your quick reply. You are all so quick & helpful.

Yes, I guess: if the query returns nada well then.....? is a problem so I think I will withdraw (or progress, depends how you look at it) to the queryTask option. The SpatialQueryAction looks
tempting because it is very short but it is limited for what I need.
Anyway I attach the error message due to the binding: <actions:SetLayerUrlAction Url="{Binding _ActiveLayer.URL}"/>
(When I put ahard coded url it works fine).

Another question regards binding to symbol. The symbol is chaned from lineSymbol to MarkerSymbol to FillSymbol depends on the type of active layer (line, point or polygon).
How can I know which symbol to bind?
In all the samples, the layer is hard coded so i guess I muss this part.

Thanks a lot,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Sun, 12 Dec 2021 03:21:34 GMT

It's pretty hard to say without understanding how the DataContext is being set. but are you implementing the INotifyPropertyChanged in your _activeLayer object? This is required to notify the object bound in Xaml that something changed in the bound object.

As for the symbol, if you have a Url being bound you could also bind a Symbol.


   Symbol="{Binding _activeLayer.Symbol}"

When you set the Url you know the type of layer it is (point, line, polygon) and can set the appropriate symbol type at that time.

Re: SpatialQueryAction & dataGrid

MiriEshel — Thu, 28 Jun 2012 04:05:51 GMT

Hi Joe,

I do implement INotifyPropertyChanged. Here is the code:

    public abstract class EventBase : INotifyPropertyChanged
     {
         public event PropertyChangedEventHandler PropertyChanged;
         protected void PropertyChangedHandler(string propertyName)
         {
             var handler = PropertyChanged;
             if (handler != null)
             {

                 handler(this, new PropertyChangedEventArgs(propertyName));
             }
         }
     }

public class ActiveLayer : EventBase
    {
        private string name;
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
                PropertyChangedHandler("Name");
            }
        }

        private string url;
        public string URL
        {
            get
            {
                return url;
            }
            set
            {
                url = value;
                PropertyChangedHandler("URL");
            }
        }

    }

Thanks,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Thu, 28 Jun 2012 04:28:43 GMT

I guess the follow-up question is where/how are you setting the DataContext of your Control?

Re: SpatialQueryAction & dataGrid

MiriEshel — Thu, 28 Jun 2012 10:44:46 GMT

Joe,

Do you mean the Button control? Here it is (with or without dataContext it gives me an error):

                              <Button DataContext="{Binding ElementName=Map}" Content="Spatial Query" Name="selRectangle" >
                                    <i:Interaction.Triggers>
                                        <i:EventTrigger EventName="Click">
                                                <esri:SpatialQueryAction
                                    DrawMode="Rectangle"
                                    LayerID="MyQueryResultsGraphicsLayer"
                                    Symbol="{StaticResource DefaultLineSymbol}"
                                    TargetName="Map" />
                                            <actions:SetLayerUrlAction Url="{Binding _ActiveLayer.URL}"/>
                                        </i:EventTrigger>
                                    </i:Interaction.Triggers>
                                </Button>

I admire your patience....

Thanks,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Sun, 12 Dec 2021 03:21:37 GMT

I admire your patience....

Thanks,
Miri

Toda Raba 🙂

In Silverlight the ah ha moment is when the data binding thing actually makes sense. The DataContext is pretty much a weakly typed object that any control can have attached to it. DataContext is inherited, so if I set the Context at the UserControl level everything shares that DataContext unless the control overrides it.

This Xaml

    <actions:SetLayerUrlAction Url="{Binding _ActiveLayer.URL}"/>

Is saying look at my DataContext (some object) for a (public) Property called _ActiveLayer and then attach to the Url property. But you have not defined this DataContext so it does not know what to look at. In the Button code it is saying the Map is DataContext and will look for a property on Map (which does not exist)

So the DataContext of the page needs to be set so the Binding knows what it should look for (I am not sure if setting on the button works or if it needs to be the page)


        public MainPage()
        {
            InitializeComponent();

            DataContext = this;
        }

in the class define your ActiveLayer object (public)


    public ActiveLayer ActiveLayer { get; set; }

Now the MainPage UserControl is bound to the class MainPage class and so

    <actions:SetLayerUrlAction Url="{Binding ActiveLayer.URL}"/>

Knows to look at the ActiveLayer property.

Likewise you could set the DataContext to the ActiveLayer object itself, and then your binding is just to the properties on the ActiveLayer. This would be a more common approach because you would normally bind to the object that is raising the PropertyChanged events


        public MainPage()
        {
            InitializeComponent();
            ActiveLayer = new ActiveLayer();
            DataContext = ActiveLayer ;
        }
      
         public ActiveLayer ActiveLayer { get; set; }

        <actions:SetLayerUrlAction Url="{Binding URL}"/>

In a statement like {Binding ElementName=MyMap, Path=Layers[MyLayer]} it is setting the DataContext local to that Binding to the specific element.

Good Luck

Re: SpatialQueryAction & dataGrid

JoeHershman — Sun, 12 Dec 2021 03:21:40 GMT

Looking at this some more I realize that the Action would not have a DataContext because it is not a FrameworkElement. So you would need to set the DataContext on something like the Button and use that to set the property on the Action

So something like this in the XAML


                <Button x:Name="QueryButton" Height="30" Width="30" Margin="0,0,2,0"
                    HorizontalContentAlignment="Left" Padding="2" Content="Query">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Click">
                            <Actions:SpatialQueryAction
                                    DrawMode="Rectangle"
                                    OutFields="FID,STATE_NAME,STATE_ABBR"
                                    LayerID="MyQueryResultsGraphicsLayer"
                                    Url="{Binding ElementName=QueryButton, Path=DataContext.Url}" 
                                    Symbol="{StaticResource GraphicsLayerFillSymbol}" QueryComplete="SpatialQueryAction_QueryComplete"
                                    TargetName="Map" />
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </Button>

And in the code


        public MainPage()
        {
            InitializeComponent();


            ActiveLayer = new ActiveLayer { Url = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/2" };


            QueryButton.DataContext = ActiveLayer;
        }




        public ActiveLayer ActiveLayer { get; set; }


        private void SpatialQueryAction_QueryComplete(object sender, EventArgs e)
        {
        }

And because I seemingly have too much time on my hands, and I thought the idea useful I wrote a SpatialQueryAction that throws a QueryComplete event at the end, which I attached

Re: SpatialQueryAction & dataGrid

MiriEshel — Fri, 29 Jun 2012 18:20:43 GMT

Hi Joe,

1. Now it is finally works. I wasn't aware of all these DataContext issues....I'm studing and programming at the same time so I miss things.
I haven't tried the symbol yet but I'm sure it will work. Thanks a lot!

2. So sweet of you to write this code on action completion. The thing is that if there is so much code for it, I don't see the advantage of using it instead of QueryTask. Can you see any advantage?

3. How do you know what is: Toda Raba?

4. Do you have a tip/sample for wrapping DataGrid (or featureDataGrid) in a draggable/floatingWindow with close button? I saw some threads about it in the forum but couldn't find someting that attracted me.

Thanks a lot and Shabat Shalom,
Miri

Re: SpatialQueryAction & dataGrid

MiriEshel — Sun, 01 Jul 2012 05:36:18 GMT

Hi,

Can I use OnApplyTemplate on the button that executes the spatialQueryAction so it will keep in a gglobal variable the last Tool that was executed?

Thanks,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Sun, 01 Jul 2012 05:47:04 GMT

Hi Joe,

1. Now it is finally works. I wasn't aware of all these DataContext issues....I'm studing and programming at the same time so I miss things.
I haven't tried the symbol yet but I'm sure it will work. Thanks a lot!

Personally for me, understanding how DataContext works took a bit, it does open up a lot more in Silverlight once it makes sense

2. So sweet of you to write this code on action completion. The thing is that if there is so much code for it, I don't see the advantage of using it instead of QueryTask. Can you see any advantage?

THe advantage and the nice thing about TriggerActions is it is a good way to separate business logic away from the UserControl code behind, really a design decision more than anything else

3. How do you know what is: Toda Raba?

Falls in the things we learned before we were 13 category I guess.;). I spent one summer in your home back during high school and hope to visit again soon because I am working in the region right now

4. Do you have a tip/sample for wrapping DataGrid (or featureDataGrid) in a draggable/floatingWindow with close button? I saw some threads about it in the forum but couldn't find someting that attracted me.

What I do is create a control that inherits from the DraggableWindow in the Template project and use that to implement that behavior. I find it a lot cleaner than trying to put everything in the MainPage. I actually have a sample of a FeatureDataGrid and FeatureDataForm integrated into a DraggableWindow I can post an example later

Good Luck

Re: SpatialQueryAction & dataGrid

MiriEshel — Sun, 01 Jul 2012 07:03:38 GMT

Hi Joe,

1. I will be happy to receive your sample. I'm also interested in minimizing the draggable window to an icon on the map. I have no clue how to do it.

2. Did you see my last thread asking about onDataTemplate of the button? What do you think?

3. I would love to host you in Israel if you decide to come again. At this moment, I know Israel much more than I know Silverlight. I hope it will change within few weeks....

Thanks a lot,
Miri

Re: SpatialQueryAction & dataGrid

MiriEshel — Mon, 02 Jul 2012 18:14:58 GMT

Hi Joe,

1. I've decided to give up on preserving the last tool meanwhile so, at the moment, I don't need the QueryComplete event at the end.
I do need to check, whether the Url of the active layer is equal to X or equal to None and if the answer is yes, do not execute the spatialQueryAction.
Is that possible without writing my own spatialQuery?

2. Please send me the sample of a FeatureDataGrid and FeatureDataForm integrated into a DraggableWindow.

I hope I don't nagg too much...

So many thanks,
Miri

Re: SpatialQueryAction & dataGrid

JoeHershman — Tue, 03 Jul 2012 13:33:38 GMT

Hi Joe,

1. I've decided to give up on preserving the last tool meanwhile so, at the moment, I don't need the QueryComplete event at the end.
I do need to check, whether the Url of the active layer is equal to X or equal to None and if the answer is yes, do not execute the spatialQueryAction.
Is that possible without writing my own spatialQuery?

2. Please send me the sample of a FeatureDataGrid and FeatureDataForm integrated into a DraggableWindow.

I hope I don't nagg too much...

So many thanks,
Miri

The RelatedEdt zip is an example of an app that has a DataGrid and DataForm working together and hosted in a DraggableWindow. There has been something wrong with ESRI's sample server for the last day so I have not finished a couple tiny spots. This was actually written to edit records in a related table. The user clicks on a point and if it has related data in the table the DataGrid is loaded. When a record in the Grid is selected the form is loaded so the record can be edited. There is an Add button to add a new record in the related table. I think it should be relatively straight forward to change to just edit the features not related records

I also attached a custom DraggableWindow that does a minimize to just the title bar. It has a lot of stuff in there that is there as part of the application framework I have developed, so it won't work as is but maybe give some ideas of how to go about it. I also added some gee-wiz animation to the close. There is also something you may find interesting in that it can flip from LeftToRight to RightToLeft dynammically

Hope that helps

Re: SpatialQueryAction & dataGrid

MiriEshel — Tue, 03 Jul 2012 18:08:07 GMT

Hi Joe,

Thanks a lot. I will look at it soon and let you know how it goes.

Thanks again,
Miri

Re: SpatialQueryAction & dataGrid

MiriEshel — Thu, 05 Jul 2012 14:25:16 GMT

Hi Joe,

Thanks. I took most of your draggableWindow code and changed it a little bit. It is really compact.

I have two questions:
1. When I do minimize and then maximize, it always returns to the original size (Width="280" Height="180" in this case) even if I resize the window.
Here is the code:

         <userControls:DraggableWindow x:Name="DragWondow" Visibility="{Binding ElementName=Map, Path=Layers[SpatialQueryGraphicsLayer].Graphics.Count, Converter={StaticResource NumOfSelectToVisibilityConverter}}" Width="280" Height="180" Foreground="Black" IsOpen="{Binding Visible, Mode=TwoWay}" Grid.Row="2" >
                <esri:FeatureDataGrid Visibility="{Binding ElementName=Map, Path=Layers[SpatialQueryGraphicsLayer].Graphics.Count, Converter={StaticResource NumOfSelectToVisibilityConverter}}" Grid.Row="2" Grid.Column="1" x:Name="MyDataGrid" Map="{Binding ElementName=Map}"
                GraphicsLayer="{Binding ElementName=Map, Path=Layers[SpatialQueryGraphicsLayer]}" />
            </userControls:DraggableWindow>

Is there a way to return to the last size of the window (after the last resize). Does it keep this size somewhere?

2. After I close the Window, it does not reopen again even if Layers[SpatialQueryGraphicsLayer].Graphics.Count greater than 0 (visibility=visible). Why?

Thanks a lot,
What would I do without you...
Miri

P.S. Do you know a way to retreive the Layer type (Point, Polyline, Polygon) of an individual layer in a dynamicMapService layer? I thought it will be part of the layerInfo or there will be some method to get it out of the dynamic layer or featureLayer but there isn't. Pretty basic....

topic Re: SpatialQueryAction & dataGrid in ArcGIS API for Silverlight Questions

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