topic Re: Adding a point feature at a device's current location in ArcGIS AppStudio Questions

Adding a point feature at a device's current location

GiatriLalla — Wed, 10 Oct 2018 15:29:58 GMT

Good Day,

I have been using the code below to zoom to the device's location and add a point feature based on the device's current location by clicking any where on the screen. The feature is being added to the service table however there is no/null geometries for each point therefore it is not showing up on the map. How can I fix this?

import QtQuick 2.7

import QtQuick.Controls 2.1

import QtQuick.Controls.Material 2.1

import QtQuick.Layouts 1.1

import QtGraphicalEffects 1.0

import ArcGIS.AppFramework 1.0

import ArcGIS.AppFramework.Controls 1.0

import Esri.ArcGISRuntime 100.2

import QtPositioning 5.3

import QtSensors 5.3

MapView{

    id: mapView

    Map{

        id: map

        initUrl: "http://melbournedev.maps.arcgis.com/home/webmap/viewer.html?webmap=24ba3f20e7424c67989e64ec740384f8"

        FeatureLayer {

            id: featureLayer

            selectionColor: "cyan"

            selectionWidth: 3

            // declare as child of feature layer, as featureTable is the default property

            ServiceFeatureTable {

                id: featureTable

                url: "https://services1.arcgis.com/NUSHso3rgWERZOFF/arcgis/rest/services/TestPoint1/FeatureServer/0"

                // make sure edits are successfully applied to the service

                onApplyEditsStatusChanged: {

                    if (applyEditsStatus === Enums.TaskStatusCompleted) {

                        console.log("successfully added feature");

                // signal handler for the asynchronous addFeature method

                onAddFeatureStatusChanged: {

                    if (addFeatureStatus === Enums.TaskStatusCompleted) {

                        // apply the edits to the service

                        featureTable.applyEdits();

    locationDisplay {

        positionSource: positionSource

        compass: compass

    PositionSource {

        id: positionSource

        active: true

        property bool isInitial: true

        onPositionChanged: {

            if(map.loadStatus === Enums.LoadStatusLoaded && isInitial) {

                isInitial = false;

                zoomToCurrentLocation();

    Compass {

        id: compass

    function zoomToCurrentLocation(){

        positionSource.update ();

        var currentPositionPoint = ArcGISRuntimeEnvironment.createObject ("Point", {x: positionSource.position.coordinate.longitude, y: positionSource.position.coordinate.latitude, spatialReference: SpatialReference.createWgs84()});

        var centerPoint = GeometryEngine.project(currentPositionPoint, mapView.spatialReference);

        var viewPointCenter = ArcGISRuntimeEnvironment.createObject("ViewpointCenter",{center: centerPoint, targetScale: 10000});

        mapView.setViewpointWithAnimationCurve(viewPointCenter, 2.0,  Enums.AnimationCurveEaseInOutCubic);

    //! [AddFeaturesFeatureService new feature at mouse click]

     onMouseClicked : {  // mouseClicked came from the MapView

        // create attributes json for the new feature

         var featureAttributes = {"Name" : "Test"};

        // create a new feature using the mouse's map point

        var feature = featureTable.createFeatureWithAttributes(featureAttributes, mapView.locationDisplay.mapPoint);

         // add the new feature to the feature table

        featureTable.addFeature(feature);

Re: Adding a point feature at a device's current location

ErwinSoekianto — Wed, 10 Oct 2018 18:13:11 GMT

Giatri,

Can you check the "addFeatureStatus" property? As stated in this doc when calling "addFeature()" function. FeatureTable QML Type | ArcGIS for Developers

It sounds like this type of question is best handled by Esri Technical Support‌ as it might require further troubleshooting.

Thanks,

Erwin

Re: Adding a point feature at a device's current location

GiatriLalla — Sun, 12 Dec 2021 09:49:22 GMT

Correct me if I am wrong, I believe that the problem lies in the mapView.locationDisplay.mapPoint;

  var feature = featureTable.createFeatureWithAttributes(featureAttributes, mapView.locationDisplay.mapPoint);

I came to this conclusion because if I replace  var feature = featureTable.createFeatureWithAttributes(featureAttributes, mouse.mapPoint) I can add random features and it works fine.

What are your thoughts?

Re: Adding a point feature at a device's current location

ErwinSoekianto — Wed, 10 Oct 2018 19:31:08 GMT

It could be. The addFeatureStatus would have made sure what's wrong.

So mapView.locationDisplay.mapPoint return null or undefined? It sounds like you are already progressing towards the resolution.

This documentation, LocationDisplay QML Type | ArcGIS for Developers , explains that LocationDisplay does not have "mapPoint" property, maybe you could try "mapLocation" property instead?

Re: Adding a point feature at a device's current location

GiatriLalla — Wed, 10 Oct 2018 19:39:50 GMT

I will try that and let you know. Thank you.

Re: Adding a point feature at a device's current location

GiatriLalla — Thu, 11 Oct 2018 15:06:53 GMT

Hi,

I tried the "mapLocation" property

(var point = mapView.locationDisplay.mapLocation)

and I am getting 0,0 now. In the greater scheme of things, atleast it's not null however still can't figure out why I can't get the correct geometry. Also, how do I check the addFeatureStatus?

Re: Adding a point feature at a device's current location

ErwinSoekianto — Thu, 11 Oct 2018 17:18:38 GMT

The reason why it is returning 0,0 could be in the description of Location Display documentation, LocationDisplay QML Type | ArcGIS for Developers

I still think that this type of question is best handled via Esri Technical Support‌, due to the nature of it and it requires more troubleshooting and back/forth.

Thank you,

Erwin

Re: Adding a point feature at a device's current location

GiatriLalla — Thu, 11 Oct 2018 17:22:01 GMT

Will check that out.

Yes I have put forward the question, however no one from the team replied.