Display a web map

Learn how to create and display a from a stored in .

display a web map

A contains the definition of a , including properties such as the , initial , , , , and . You can author and save web maps using the or and share them in . Each web map is stored as an item in or , allowing you to access a from a using its and display it in your app.

In this tutorial, you use a 's to display a of

trails, trailheads and parks in the Santa Monica Mountains

. The web map is hosted in .

Prerequisites

Before starting this tutorial:

  1. You need an ArcGIS Location Platform or ArcGIS Online account.

  2. Your system meets the system requirements.

  3. The ArcGIS Runtime API for Qt is installed.

Choose your API

You can do this tutorial in C++ or QML. Make your selection:

Steps for C++

Open the project and set the API key

  1. To start this tutorial, complete the Display a map tutorial or download and unzip the solution.

  2. Open the display_a_map project in Qt Creator.

  3. If you downloaded the solution, get an access token and set your API key.

Get the web map item ID

You can use to create and view . Use the to identify the web map . This item ID will be used later in the tutorial.

  1. Go to the LA Trails and Parks web map in the Map Viewer in . This web map displays

    trails, trailheads and parks in the Santa Monica Mountains

    .
  2. Make a note of the item ID at the end of the browser's URL. The item ID should be

    41281c51f9de45edaf1c8ed44bb10e30

    .

Initialize the map using a web map

  1. In Projects, double-click Sources > Display_a_map.cpp to open the file.

  2. Remove the line of code in the constructor that initializes m_map.

    Display_a_map.cpp
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    Display_a_map::Display_a_map(QObject* parent /* = nullptr */):
    
        QObject(parent),
    
        m_map(new Map(BasemapStyle::ArcGISTopographic, this))
    
  3. In the setupViewpoint() method, replace the existing code with the following since the web map defines these values. This code creates a QString named item_id and sets it to the for the LA Trails and Parks web map. It appends the item ID to the ArcGIS Online base URL and stores it in a QUrl. The new code creates a Map from the web map configuration specified by the item ID.

    Display_a_map.cpp
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    MapQuickView* Display_a_map::mapView() const
    {
        return m_mapView;
    }
    
    void Display_a_map::setupViewpoint()
    {
    
      const QString item_id("41281c51f9de45edaf1c8ed44bb10e30");
      const QUrl portal_url(QString("https://arcgis.com/sharing/rest/content/items/" + item_id));
      m_map = new Map(portal_url, this);
      m_mapView->setMap(m_map);
    
    Expand
  4. Press Ctrl + R to run the app.

You will see a map of trails, trailheads and parks in the Santa Monica Mountains. Click, drag, and scroll the mouse wheel on the map view to explore the map.

Steps for QML

Open the project and set the API key

  1. To start this tutorial, complete the Display a map tutorial or download and unzip the solution.

  2. Open the display_a_map project in Qt Creator.

  3. If you downloaded the solution, get an access token and set your API key.

Get the web map item ID

You can use to create and view . Use the to identify the web map . This item ID will be used later in the tutorial.

  1. Go to the LA Trails and Parks web map in the Map Viewer in . This web map displays

    trails, trailheads and parks in the Santa Monica Mountains

    .
  2. Make a note of the item ID at the end of the browser's URL. The item ID should be

    41281c51f9de45edaf1c8ed44bb10e30

    .

Initialize the map using a web map

  1. If the main.qml file is not already open, in the Projects window, navigate to Resources > qml\qml.qrc > /qml and open main.qml.

  2. Remove the code that sets BasemapStyle and initialViewpoint.

    main.qml
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            // add a map to the mapview
            Map {
    
                // add the ArcGISTopographic basemap to the map
                initBasemapStyle: Enums.BasemapStyleArcGISTopographic
    
                initialViewpoint: viewpoint
    
    Expand
  3. Remove the block of code that creates ViewpointCenter.

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            ViewpointCenter {
                id: viewpoint
    
                // Specify the center Point
                center: Point {
                    x: -118.80543
                    y: 34.02700
                    spatialReference: SpatialReference {wkid: 4326}
                }
    
            // Specify the scale
            targetScale: 100000.0
            }
    
    Expand
  4. Add a PortalItem and set the itemId to the ID for the LA Trails and Parks web map. This code creates a Map from the web map configuration.

    main.qml
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            Map {
    
                PortalItem {
                    itemId: "41281c51f9de45edaf1c8ed44bb10e30"
                }
    
    Expand
  5. Press Ctrl + R to run the app.

You will see a map of trails, trailheads and parks in the Santa Monica Mountains. Click, drag, and scroll the mouse wheel on the map view to explore the map.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

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