Feature layer selection

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Select features in a feature layer.

screenshot

Use case

Selecting features, whether by query or identify, can be an important step both in editing data and visualizing results. One possible use case would be to query a feature layer containing street furniture. A query might look for type "bench" and return a list of bench features contained in the features with an attribute of type bench. These might be selected for further editing (see FeatureQueryResult) or may just be highlighted visually.

How to use the sample

Click on a feature in the map. All features within a given tolerance (in pixels) of the click will be selected.

How it works

  1. Create a ServiceFeatureTable from a feature service URL.
  2. Create a FeatureLayer from the service feature table.
  3. Identify nearby features at the clicked location using identifyLayer(featureLayer, mouseEvent.x(), mouseEvent.y(), tolerance, returnPopupsOnly, maxResults) on the map view.
  4. Select all identified features in the feature layer with selectFeatures(features).

About the data

This sample uses the Gross Domestic Product, 1960-2016 feature service. Only the 2016 GDP values are shown.

Relevant API

  • Feature
  • FeatureLayer
  • ServiceFeatureTable

Tags

features, layers, select, selection, tolerance

Sample Code

FeatureLayerSelection.qmlFeatureLayerSelection.cppFeatureLayerSelection.h
                                                                
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// [WriteFile Name=FeatureLayerSelection, Category=Features]
// [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 Esri.Samples 1.0

FeatureLayerSelectionSample {
    id: featureLayerSelectionSample
    width: 800
    height: 600

    // add a mapView component
    MapView {
        id: mapView
        anchors {
            left: parent.left
            right: parent.right
            top: parent.top
            bottom: messageBar.top
        }
        objectName: "mapView"
    }

    Rectangle {
        id: messageBar
        anchors {
            left: parent.left
            right: parent.right
            bottom: parent.bottom
        }
        height: 30
        color: "lightgrey"
        border {
            width: 0.5
            color: "black"
        }

        Text {
            id: msgText
            anchors {
                verticalCenter: parent.verticalCenter
                left: parent.left
                leftMargin: 10
            }
            // set the text equal to the C++ property
            text: featureLayerSelectionSample.selectedFeatureText
            font.pixelSize: 14
        }
    }
}

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