Best practice for selecting features in map from a custom widget

[MarkJTurnbull]

I am developing an app in ExB that receives URL parameters and based on the parameters passed, it will select and zoom to the features in the map.

I have worked out how to get the map and layer datasources the map is using, but am unable to select features in the layer datasource. I am trying to call the selectRecordsById(string[]) method on the layer datasource but my unit testing shows that the selectRecordsById() method is not doing anything, I am passing it objectids (is this correct?). Am I on the right track? 

Is there a sample somehwere that demonstrates the best practice for selecting features in a map from a custom widget?

[RobertScheitlin__GISP · Accepted solution]

@MarkJTurnbull 

This is how I select features in a DS.

      const dsManager = DataSourceManager.getInstance()
      const featureDS = dsManager.getDataSource(myDSId) as FeatureLayerDataSource
      featureDS.query({objectIds:[ObjectId_Array]}).then(qr=>{
        MessageManager.getInstance().publishMessage(
          new DataRecordsSelectionChangeMessage(this.props.id, qr.records)
        )
        featureDS.selectRecordsByIds?.(qr.records.map((item) => item.getId()))
      })

[MarkJTurnbull]

Thanks for getting back to me Robert.

I have tried implementing something very similar to your sample in my code and it is still not working. I have debugged and think it has something to do with the lifecycle of the featureDS, its status is showing as unloaded and it has no records. I am deriving my datasourceID from the JimuMapView.dataSourceId and then getting a MapDataSource from the DataSourceManager, which I am then using mapDataSource.getDataSourceByLayer(layer id) to get a featureLayerDataSource using a nominated layerID. This is the datasource that is appearing unloaded. I have since added a load method with a where clause of 1=1 then run a query against the loaded featureLayerDataSource with the where clause for the selection. It seems to now perform the select (as the URL gets querystring parameters with the layer reference and objectid for the selected faeture) but the map widget is not showing the selected features. Am I on the right track? Why is the featureLayerDataSource in an unloaded state (especially since the layer is visble in the map widget)? Should I be doing something else to get the FeatureLayerDataSource into a loaded state?

[MarkJTurnbull]

Correction, I have found that the map is actually showing the selected feature. It seems as though the message action is failing to zoom on the map. The message seems to be getting through because the pan to action works, it just doesn't want to zoom to it. Is this a bug/known issue?

[RobertScheitlin__GISP]

There is no bug that I am aware of.