Getting started with Blazor LinearGauge in Blazor Web App

31 Jan 20246 minutes to read

The Blazor LinearGauge is an ideal component for visualizing numeric values in a linear scale with features like multiple axes, different orientations, and more.

This section briefly explains about how to include Blazor LinearGauge component in your Blazor Web App using Visual Studio.

Prerequisites

System requirements for Blazor components

Create a new Blazor Web App

You can create a Blazor Web App using Visual Studio 2022 via Microsoft Templates or the Syncfusion Blazor Extension.

You need to configure the corresponding Interactive render mode and Interactivity location while creating a Blazor Web Application.

Install Syncfusion Blazor LinearGauge NuGet in the App

To add Blazor LinearGauge 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.LinearGauge.

If you utilize WebAssembly or Auto render modes in the Blazor Web App need to be install Syncfusion Blazor components NuGet packages within the client project.

Alternatively, you can utilize the following package manager command to achieve the same.

Package Manager
Install-Package Syncfusion.Blazor.LinearGauge -Version 25.1.35

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.LinearGauge namespace .

@using Syncfusion.Blazor
@using Syncfusion.Blazor.LinearGauge

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

If you select an Interactive render mode as WebAssembly or Auto, you need to register the Syncfusion Blazor service in both ~/Program.cs files of your Blazor Web App.

....
using Syncfusion.Blazor;
....
builder.Services.AddSyncfusionBlazor();
....

Add script resources

The script can be accessed from NuGet through Static Web Assets. Include the script reference at the end of the <body> in the ~/Components/App.razor file as shown below:

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

NOTE

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

Add Syncfusion Blazor LinearGauge component

Add the Syncfusion Blazor LinearGauge component in the ~Pages/.razor file. If an interactivity location as Per page/component in the web app, define a render mode at the top of the ~Pages/.razor component, as follows:

RAZOR

@* desired render mode define here *@
@rendermode InteractiveAuto

RAZOR
<SfLinearGauge>
    <LinearGaugeAxes>
        <LinearGaugeAxis>
            <LinearGaugePointers>
                <LinearGaugePointer></LinearGaugePointer>
            </LinearGaugePointers>
        </LinearGaugeAxis>
    </LinearGaugeAxes>
</SfLinearGauge>

Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. This will render the Syncfusion Blazor LinearGauge component in your default web browser.

NOTE

View Sample in GitHub.

Set pointer value

Pointers are used to indicate values on an axis. You can change the pointer value using the PointerValue property in the LinearGaugePointer.

NOTE

In LinearGauge, you can configure multiple axes. On each axis, you can add a pointer.

RAZOR
<SfLinearGauge>
    <LinearGaugeAxes>
        <LinearGaugeAxis>
            <LinearGaugePointers>
                <LinearGaugePointer PointerValue="40">
                </LinearGaugePointer>
            </LinearGaugePointers>
        </LinearGaugeAxis>
    </LinearGaugeAxes>
</SfLinearGauge>

Add a title for Blazor LinearGauge

The title can be added to the linear gauge to provide a piece of quick information to the users about the context of the rendered linear gauge. You can add the title to the linear gauge using Title property in SfLinearGauge.

RAZOR
<SfLinearGauge Title="Linear Gauge">
    <LinearGaugeAxes>
        <LinearGaugeAxis>
            <LinearGaugePointers>
                <LinearGaugePointer></LinearGaugePointer>
            </LinearGaugePointers>
        </LinearGaugeAxis>
    </LinearGaugeAxes>
</SfLinearGauge>

Add ranges in the Blazor LinearGauge

The range is used to specify a group of scale values in the gauge. You can set the range start and end using Start and End properties in the LinearGaugeRange. You can add any number of ranges for an axis using LinearGaugeRange.

RAZOR
<SfLinearGauge>
    <LinearGaugeAxes>
        <LinearGaugeAxis Minimum="0" Maximum="200">
            <LinearGaugeAxisLabelStyle Format="{value}°C"></LinearGaugeAxisLabelStyle>
            <LinearGaugePointers>
                <LinearGaugePointer PointerValue="140">
                </LinearGaugePointer>
            </LinearGaugePointers>
            <LinearGaugeRanges>
                <LinearGaugeRange Start="0" End="80" Color="#ff5985"></LinearGaugeRange>
                <LinearGaugeRange Start="80" End="120" Color="#ffb133"></LinearGaugeRange>
                <LinearGaugeRange Start="120" End="140" Color="#fcde0b"></LinearGaugeRange>
                <LinearGaugeRange Start="140" End="200" Color="#27d5ff"></LinearGaugeRange>
            </LinearGaugeRanges>
        </LinearGaugeAxis>
    </LinearGaugeAxes>
</SfLinearGauge>