popupdefinition=null ArcGIS Runtime SDK for .NET

RomanBoros

Hi, I am trying to show popups in ArcGIS Runtime SDK for .NET, but even with defined popup definitions on the portal when I retrieve the feature layer from the portal I get popupdefinition=null. Should I invoke a special method which will pull the popup definitions? I couldn't find anything like that in the documentation.  

KevinL20

In PopupDefinition the Fields property only pertains to the order that the fields will be shown. The Elements property of PopupDefinition must be initialized so that the fields will appear in the callout.

Here's an example from a project that I've been working on recently:

//fields for popups
//Takes in FieldName (the field to render on), label (alias of the field); rest is self-explanatory
private static readonly PopupField[] _lotsFields =
{
    new PopupField()
    {
        FieldName = "building footprint",
        Label = "Building Footprint",
        IsVisible = true,
        IsEditable = false,
        StringFieldOption = PopupStringFieldOption.SingleLine
    },
    new PopupField()
    {
        FieldName = "land use",
        Label = "Land Use",
        IsVisible = true,
        IsEditable = false,
        StringFieldOption = PopupStringFieldOption.SingleLine
    },
    new PopupField()
    {
        FieldName = "lot size (acres)",
        Label = "Lot Size (acres)",
        IsVisible = true,
        IsEditable = false,
        StringFieldOption = PopupStringFieldOption.SingleLine
    },
    new PopupField()
    {
        FieldName = "land value/acre ($)",
        Label = "Land Value/acre ($)",
        IsVisible = true,
        IsEditable = false,
        StringFieldOption = PopupStringFieldOption.SingleLine
    },
};

//Popup title definition field
//Wrap title field in curly braces to indicate it's a field-derived title
private const string _lotsPopupTitle = "{address}";

//Method to create popupdefinition for the layer
private PopupDefinition ConfigurePopupDefinition(PopupField[] popupFields,    string popupTitleField)
{
    PopupDefinition popupDef = new PopupDefinition();
    popupDef.Title = popupTitleField;
    
    //add fields to popup elements to create a popup table
    popupDef.Elements.Add(new FieldsPopupElement(popupFields));
    return popupDef;
}

//GeoViewTapped event handler
//Will embed popup into callout
private async void MapView_GeoViewTapped(object sender, GeoViewInputEventArgs e)
{
    try
    {
        //Pixel-relative click position
        Point clickPosition = e.Position;

        //Lat-long relative click location
        MapPoint clickLocation = e.Location;

        //Get layer where click was at
        FeatureLayer currentLayer = MyMapView.Map.OperationalLayers[0] as FeatureLayer;

        //Clear selected features
        currentLayer.ClearSelection();

        Popup? popup = await GetPopupAsync(clickPosition, currentLayer);

        if (popup != null)
        {
            //Feature that was clicked
            Feature feature = popup.GeoElement as Feature;

            await ShowPopupAsync(popup, clickLocation, feature);
            currentLayer.SelectFeature(feature);
            return;
        }
        //Hide callout if no popup exists
        MyMapView.DismissCallout();
    }
    catch (Exception ex)
    {
        MessageBox.Show($"Loading popup definition for feature    failed!\n\n{ex.ToString()}");
    }
}

private async Task<Popup?> GetPopupAsync(Point clickLocation, FeatureLayer currentLayer)
{
    //Get the clicked feature
    IdentifyLayerResult identifiedFeature = await MyMapView.IdentifyLayerAsync(currentLayer, clickLocation, 1, true);

    return identifiedFeature?.Popups.FirstOrDefault() ?? null;
}

//show popup via callout
private async Task ShowPopupAsync(Popup popup, MapPoint clickLocation, Feature feature)
{
    await MyMapView.SetViewpointCenterAsync(clickLocation);

    _featurePopupViewer.Popup = popup;
    MyMapView.ShowCalloutAt(clickLocation, _featurePopupViewer);
}