Getting Started with Blazor Maps Component

30 Jan 202416 minutes to read

This section briefly explains about how to include Blazor Maps component in your Blazor Server App and Blazor WebAssembly App using Visual Studio.

Prerequisites

Create a new Blazor App in Visual Studio

You can create a Blazor Server App or Blazor WebAssembly App using Visual Studio via Microsoft Templates or the Syncfusion Blazor Extension.

Install Syncfusion Blazor Maps NuGet in the App

To add Blazor Maps component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search and install Syncfusion.Blazor.Maps. Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.Maps -Version 24.2.3

NOTE

Syncfusion Blazor components are available in nuget.org. Refer to NuGet packages topic for available NuGet packages list with component details.

Register Syncfusion Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor and Syncfusion.Blazor.Maps namespace.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.Maps

Now, register the Syncfusion Blazor Service in the ~/Program.cs file of your Blazor Server App or Blazor WebAssembly App.

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Syncfusion.Blazor;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSyncfusionBlazor();

var app = builder.Build();
....
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSyncfusionBlazor();
await builder.Build().RunAsync();
....

Add script resources

The script can be accessed from NuGet through Static Web Assets. Reference the script in the <head> of the main page as follows:

  • For .NET 6 Blazor Server app, include it in ~/Pages/_Layout.cshtml file.

  • For .NET 7 Blazor Server app, include it in the ~/Pages/_Host.cshtml file.

  • For Blazor WebAssembly app, include it in the ~/index.html file.

<head>
    ....
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

NOTE

Check out the Adding Script Reference topic to learn different approaches for adding script references in your Blazor application.

Add Blazor Maps component

Add the Syncfusion Blazor Maps component in the ~/Pages/Index.razor file.

<SfMaps>
</SfMaps>

The Maps will not show any content on the web page while running the application because the properties related to the layer are not initialized in the above code.

Adding GeoJSON data in Blazor Maps layer

Bind GeoJSON data to the Maps to render any geometric shape in SVG (Scalable Vector Graphics) for powerful data visualization of shapes. For example, you can render the World map and make desired customizations on it. You can also add any number of layers in the Maps.

You can use the ShapeData property in MapsLayer to load the GeoJSON shape data into the Maps component.

<SfMaps>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}' TValue="string">
        </MapsLayer>
    </MapsLayers>
</SfMaps>
Blazor Maps with GeoJSON Layer

NOTE

The “world-map.json” file contains the World map GeoJSON data.

Bind data source

The DataSource property is used to represent statistical data in the Maps component. We can define a list of objects as a data source to the Maps component. This data source will be further used to color the map, display data labels, display tooltips, and more. Assign the below list SecurityCouncilDetails to the DataSource property in MapsLayer.

@code {
    public List<UNCouncilCountry> SecurityCouncilDetails = new List<UNCouncilCountry>{
         new UNCouncilCountry { Name= "China", Membership= "Permanent"},
         new UNCouncilCountry { Name= "France", Membership= "Permanent" },
         new UNCouncilCountry { Name= "Russia", Membership= "Permanent"},
         new UNCouncilCountry { Name= "Kazakhstan", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Poland", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Sweden", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "United Kingdom", Membership= "Permanent"},
         new UNCouncilCountry { Name= "United States", Membership= "Permanent"},
         new UNCouncilCountry { Name= "Bolivia", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Eq. Guinea", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Ethiopia", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Côte d Ivoire", Membership= "Permanent"},
         new UNCouncilCountry { Name= "Kuwait", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Netherlands", Membership= "Non-Permanent"},
         new UNCouncilCountry { Name= "Peru", Membership= "Non-Permanent"}
    };

    public class UNCouncilCountry
    {
        public string Name { get; set; }
        public string Membership { get; set; }
    };
}

NOTE

The United Nations Security Council data is referred from source.

You should also specify the field names in the shape data and data source to the ShapePropertyPath and ShapeDataPath properties, respectively. These are used to identify the appropriate shapes and match the specific data source values to them.

NOTE

Please refer to the section for more information on data binding.

<SfMaps>
    <MapsLayers>
        @*To map shape data name field and data source field*@
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
        </MapsLayer>
    </MapsLayers>
</SfMaps>

NOTE

For example, consider field names specified in ShapePropertyPath and ShapeDataPath have the same value: “United States”. So corresponding color, data label and tooltip related settings will be applied to the United States shape.

Apply color mapping

The color mapping supports customization of shape colors based on the underlying value of shape received from the bound data source. The values from the field name specified in the ShapeDataPath property will be compared for the shapes with the values in the field name specified in the ColorValuePath property in MapsShapeSettings. Also, specify color and value in MapsShapeColorMapping. Here, in this example, “#EDB46F” is specified for “Permanent” and “#F1931B” is specified for “Non-Permanent”.

<SfMaps>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
            @* Color mapping related configuration *@
            <MapsShapeSettings Fill="#E5E5E5" ColorValuePath="Membership">
                <MapsShapeColorMappings>
                    <MapsShapeColorMapping Value="Permanent" Color='new string[] {"#EDB46F"}'></MapsShapeColorMapping>
                    <MapsShapeColorMapping Value="Non-Permanent" Color='new string[] {"#F1931B"}'></MapsShapeColorMapping>
                </MapsShapeColorMappings>
            </MapsShapeSettings>
        </MapsLayer>
    </MapsLayers>
</SfMaps>
Blazor Maps with Color Mapping

NOTE

Refer code block to know the property value of SecurityCouncilDetails.

Adding data labels

Label provides information to users about the shapes, and you can enable label text to the shapes in the Maps component by setting the Visible property as true and field name from data source in the LabelPath property in MapsDataLabelSettings.

<SfMaps>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
            @* To add data labels *@
            <MapsDataLabelSettings Visible="true" LabelPath="Name" IntersectionAction="IntersectAction.Hide"></MapsDataLabelSettings>
            <MapsShapeSettings Fill="#E5E5E5" ColorValuePath="Membership">
                <MapsShapeColorMappings>
                    <MapsShapeColorMapping Value="Permanent" Color='new string[] {"#EDB46F"}'></MapsShapeColorMapping>
                    <MapsShapeColorMapping Value="Non-Permanent" Color='new string[] {"#F1931B"}'></MapsShapeColorMapping>
                </MapsShapeColorMappings>
            </MapsShapeSettings>
        </MapsLayer>
    </MapsLayers>
</SfMaps>

NOTE

Refer code block to know the property value of SecurityCouncilDetails.

Blazor Maps with Label

Adding title for Blazor Maps

Title can be added to the Maps to provide quick information to the users about the shapes rendered in the component. You can add a title using Text property in MapsTitleSettings.

<SfMaps>
    @* To add title *@
    <MapsTitleSettings Text="Members of the UN Security Council"></MapsTitleSettings>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
            <MapsDataLabelSettings Visible="true" LabelPath="Name" IntersectionAction="IntersectAction.Hide"></MapsDataLabelSettings>
            <MapsShapeSettings Fill="#E5E5E5" ColorValuePath="Membership">
                <MapsShapeColorMappings>
                    <MapsShapeColorMapping Value="Permanent" Color='new string[] {"#EDB46F"}'></MapsShapeColorMapping>
                    <MapsShapeColorMapping Value="Non-Permanent" Color='new string[] {"#F1931B"}'></MapsShapeColorMapping>
                </MapsShapeColorMappings>
            </MapsShapeSettings>
        </MapsLayer>
    </MapsLayers>
</SfMaps>

NOTE

Refer code block to know the property value of SecurityCouncilDetails.

Blazor Maps with Title

Enable legend

The legend items are used to denote color mapping categories, and you can show legend for the Maps by setting the Visible property to true in MapsLegendSettings.

<SfMaps>
    <MapsTitleSettings Text="Members of the UN Security Council"></MapsTitleSettings>
    @* To add legend *@
    <MapsLegendSettings Visible="true"></MapsLegendSettings>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
            <MapsDataLabelSettings Visible="true" LabelPath="Name" IntersectionAction="IntersectAction.Hide"></MapsDataLabelSettings>
            <MapsShapeSettings Fill="#E5E5E5" ColorValuePath="Membership">
                <MapsShapeColorMappings>
                    <MapsShapeColorMapping Value="Permanent" Color='new string[] {"#EDB46F"}'></MapsShapeColorMapping>
                    <MapsShapeColorMapping Value="Non-Permanent" Color='new string[] {"#F1931B"}'></MapsShapeColorMapping>
                </MapsShapeColorMappings>
            </MapsShapeSettings>
        </MapsLayer>
    </MapsLayers>
</SfMaps>

NOTE

Refer code block to know the property value of SecurityCouncilDetails.

Blazor Maps with Legend

Enable tooltip

The tooltip can be used when you cannot display information using the data labels due to space constraints. You can enable tooltip by setting the Visible property to true in MapsLayerTooltipSettings.

<SfMaps>
    <MapsTitleSettings Text="Members of the UN Security Council"></MapsTitleSettings>
    <MapsLegendSettings Visible="true"></MapsLegendSettings>
    <MapsLayers>
        <MapsLayer ShapeData='new {dataOptions= "https://cdn.syncfusion.com/maps/map-data/world-map.json"}'
                   ShapePropertyPath='new string[] {"name"}'
                   DataSource="SecurityCouncilDetails"
                   ShapeDataPath="Name" TValue="UNCouncilCountry">
            <MapsDataLabelSettings Visible="true" LabelPath="Name" IntersectionAction="IntersectAction.Hide"></MapsDataLabelSettings>
            <MapsShapeSettings Fill="#E5E5E5" ColorValuePath="Membership">
                <MapsShapeColorMappings>
                    <MapsShapeColorMapping Value="Permanent" Color='new string[] {"#EDB46F"}'></MapsShapeColorMapping>
                    <MapsShapeColorMapping Value="Non-Permanent" Color='new string[] {"#F1931B"}'></MapsShapeColorMapping>
                </MapsShapeColorMappings>
            </MapsShapeSettings>
            @* To add tooltip for the shape *@
            <MapsLayerTooltipSettings Visible='true' ValuePath="Name"></MapsLayerTooltipSettings>
        </MapsLayer>
    </MapsLayers>
</SfMaps>

NOTE

Refer code block to know the property value of SecurityCouncilDetails.

Blazor Maps with Tooltip

NOTE

View Sample in GitHub.

See also