Delete features (feature service)
Delete features from an online feature service.
Use case
Sometimes users may want to delete features from an online feature service.
How to use the sample
- click on a feature on the Map
- click on the delete button
How it works
- Create a
ServiceFeatureTable
object from a URL. - Create a
FeatureLayer
from the service feature table. - Select features from the feature layer via
selectFeatures()
. - Remove the selected features from the table using
deleteFeatures()
. - Update the table on the server using
applyEdits()
.
Relevant API
- Feature
- FeatureLayer
- ServiceFeatureTable
Tags
deletion, feature, online, Service, table
Sample Code
DeleteFeaturesFeatureService.qml
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// [WriteFile Name=DeleteFeaturesFeatureService, Category=EditData]
// [Legal]
// Copyright 2016 Esri.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]
import QtQuick
import QtQuick.Controls
import Esri.ArcGISRuntime
import Esri.ArcGISRuntime.Toolkit
Rectangle {
width: 800
height: 600
property Point calloutLocation
property string damageType
// Create MapView that contains a Map
MapView {
id: mapView
anchors.fill: parent
wrapAroundMode: Enums.WrapAroundModeDisabled
Component.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
// Set the initial basemap to Streets
Basemap {
initStyle: Enums.BasemapStyleArcGISStreets
}
// Set the initial viewpoint over The United States
ViewpointCenter {
Point {
x: -10800000
y: 4500000
spatialReference: SpatialReference {
wkid: 102100
}
}
targetScale: 3e7
}
FeatureLayer {
id: featureLayer
// declare as child of feature layer, as featureTable is the default property
ServiceFeatureTable {
id: featureTable
url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0"
// make sure edits are successfully applied to the service
onApplyEditsStatusChanged: {
if (applyEditsStatus === Enums.TaskStatusCompleted) {
console.log("successfully deleted feature");
}
}
// signal handler for the asynchronous deleteFeature method
onDeleteFeatureStatusChanged: {
if (deleteFeatureStatus === Enums.TaskStatusCompleted) {
// apply the edits to the service
featureTable.applyEdits();
}
}
}
// signal handler for asynchronously fetching the selected feature
onSelectedFeaturesStatusChanged: {
if (selectedFeaturesStatus === Enums.TaskStatusCompleted) {
while (selectedFeaturesResult.iterator.hasNext) {
// obtain the feature
const feat = selectedFeaturesResult.iterator.next();
// delete the feature in the feature table asynchronously
featureTable.deleteFeature(feat);
}
}
}
// signal handler for selecting features
onSelectFeaturesStatusChanged: {
if (selectFeaturesStatus === Enums.TaskStatusCompleted) {
if (!selectFeaturesResult.iterator.hasNext)
return;
const feat = selectFeaturesResult.iterator.next();
damageType = feat.attributes.attributeValue("typdamage");
calloutLocation = feat.geometry.extent.center;
// show the callout
callout.showCallout();
}
}
}
}
QueryParameters {
id: params
}
// hide the callout after navigation
onViewpointChanged: {
if (callout.calloutVisible)
callout.dismiss();
}
onMouseClicked: mouse => {
// reset the map callout and update window
featureLayer.clearSelection();
if (callout.calloutVisible)
callout.dismiss();
//! [DeleteFeaturesFeatureService identify feature]
// call identify on the feature layer
const tolerance = 10;
const returnPopupsOnly = false;
mapView.identifyLayerWithMaxResults(featureLayer, mouse.x, mouse.y, tolerance, returnPopupsOnly, 1);
//! [DeleteFeaturesFeatureService identify feature]
}
onIdentifyLayerStatusChanged: {
if (identifyLayerStatus === Enums.TaskStatusCompleted) {
if (identifyLayerResult.geoElements.length > 0) {
// get the objectid of the identifed object
params.objectIdsAsInts = [identifyLayerResult.geoElements[0].attributes.attributeValue("objectid")];
// query for the feature using the objectid
featureLayer.selectFeaturesWithQuery(params, Enums.SelectionModeNew);
}
}
}
calloutData {
location: calloutLocation
// We use the HTML to bold, increase the pt size, and center-align the the damageType title.
title: "<br><b><font size=\"+2\">%1</font></b>".arg(damageType)
}
// map callout window
Callout {
id: callout
accessoryButtonType: "Custom"
customImageUrl: "qrc:/Samples/EditData/DeleteFeaturesFeatureService/ic_menu_trash_light.png"
calloutData: parent.calloutData
background: Rectangle {
border.width: 1
border.color: "lightgrey"
}
leaderPosition: Callout.LeaderPosition.Automatic
onAccessoryButtonClicked: {
if (callout.calloutVisible)
callout.dismiss();
featureLayer.selectedFeatures();
}
}
}
}