Update feature attributes in an online feature service.
Use case
Online feature services can be updated with new data. This is useful for updating existing data in real time while working in the field.
How to use the sample
To change the feature's damage property, tap the feature to select it, and update the damage type using the drop down.
Features in the map represent damage inspection points and are symbolized based on an attribute specifying the type of damage. Selecting an inspection point displays a callout. The callout contains information about the type of damage. To change the type of damage, select the information button in the callout. An editing window appears, allowing you to choose new attribute values. Selecting the update button will update the inspection point with the new value.
This is done by first obtaining the inspection point feature after it is selected. Once the feature is obtained, the feature's attribute is updated by calling setAttributeValue. To update the feature in the feature table, call updateFeature and pass in the edited feature. Finally, to update the service, call applyEdits to apply the edits to the service.
How it works
- Create a
ServiceFeatureTableobject from a URL.- When the table loads, you can get the domain to determine which options to present in your UI.
- Create a
FeatureLayerobject from theServiceFeatureTable. - Select features from the
FeatureLayer. - To update the feature's attribute, first load it, then use the
attributeValue. - Update the table with
updateFeature. - After a change, apply the changes on the server using
applyEdits.
Relevant API
- ArcGISFeature
- FeatureLayer
- ServiceFeatureTable
Tags
amend, attribute, details, edit, editing, information, value
Sample Code
UpdateAttributesFeatureService.qml
// [WriteFile Name=UpdateAttributesFeatureService, 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 2.6
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtGraphicalEffects 1.0
import Esri.ArcGISRuntime 100.15
import Esri.ArcGISRuntime.Toolkit 100.15
Rectangle {
width: 800
height: 600
readonly property var featAttributes: ["Destroyed", "Major", "Minor", "Affected", "Inaccessible"]
property string damageType
property var selectedFeature: null
// 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 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 updated feature");
}
}
// signal handler for the asynchronous updateFeature method
onUpdateFeatureStatusChanged: {
if (updateFeatureStatus === Enums.TaskStatusCompleted) {
// apply the edits to the service
featureTable.applyEdits();
}
}
}
// signal handler for selecting features
onSelectFeaturesStatusChanged: {
if (selectFeaturesStatus === Enums.TaskStatusCompleted) {
if (!selectFeaturesResult.iterator.hasNext)
return;
selectedFeature = selectFeaturesResult.iterator.next();
damageType = selectedFeature.attributes.attributeValue("typdamage");
// show the callout
callout.showCallout();
// set the combo box's default value
damageComboBox.currentIndex = featAttributes.indexOf(damageType);
}
}
}
}
QueryParameters {
id: params
}
// hide the callout after navigation
onViewpointChanged: {
if (callout.visible)
callout.dismiss();
updateWindow.visible = false;
}
onMouseClicked: {
// reset the map callout and update window
featureLayer.clearSelection();
if (callout.visible)
callout.dismiss();
updateWindow.visible = false;
mapView.identifyLayerWithMaxResults(featureLayer, mouse.x, mouse.y, 10, false, 1);
}
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 {
// HTML to style the title text by centering it, increase pt size,
// and bolding it.
title: "<br><b><font size=\"+2\">%1</font></b>".arg(damageType)
location: selectedFeature ? selectedFeature.geometry : null
}
Callout {
id: callout
calloutData: parent.calloutData;
borderColor: "lightgrey"
borderWidth: 1
leaderPosition: leaderPositionEnum.Automatic
onAccessoryButtonClicked: {
updateWindow.visible = true;
}
}
}
// Update Window
Rectangle {
id: updateWindow
width: childrenRect.width
height: childrenRect.height
anchors.centerIn: parent
radius: 10
visible: false
GaussianBlur {
anchors.fill: updateWindow
source: mapView
radius: 40
samples: 20
}
MouseArea {
anchors.fill: parent
onClicked: mouse.accepted = true;
onWheel: wheel.accepted = true;
}
GridLayout {
columns: 2
anchors.margins: 5
Text {
Layout.columnSpan: 2
Layout.margins: 5
text: "Update Attribute"
font.pixelSize: 16
}
ComboBox {
property int modelWidth: 0
Layout.minimumWidth: modelWidth + leftPadding + rightPadding + indicator.width
Layout.columnSpan: 2
Layout.margins: 5
Layout.fillWidth: true
id: damageComboBox
model: featAttributes
Component.onCompleted : {
for (let i = 0; i < model.length; ++i) {
metrics.text = model[i];
modelWidth = Math.max(modelWidth, metrics.width);
}
}
TextMetrics {
id: metrics
font: damageComboBox.font
}
}
Button {
Layout.margins: 5
text: "Update"
function doUpdateAttribute(){
if (selectedFeature.loadStatus === Enums.LoadStatusLoaded) {
selectedFeature.onLoadStatusChanged.disconnect(doUpdateAttribute);
selectedFeature.attributes.replaceAttribute("typdamage", damageComboBox.currentText);
// update the feature in the feature table asynchronously
featureTable.updateFeature(selectedFeature);
}
}
// once the update button is clicked, hide the windows, and fetch the currently selected features
onClicked: {
if (callout.visible)
callout.dismiss();
updateWindow.visible = false;
selectedFeature.onLoadStatusChanged.connect(doUpdateAttribute);
selectedFeature.load();
}
}
Button {
Layout.alignment: Qt.AlignRight
Layout.margins: 5
text: "Cancel"
// once the cancel button is clicked, hide the window
onClicked: updateWindow.visible = false;
}
}
}
}