Blazor Gantt Chart Component in WebAssembly App using Visual Studio

14 Nov 202220 minutes to read

This article provides a step-by-step instructions for building Blazor WebAssembly App with Blazor Gantt Chart component using Visual Studio.

Prerequisites

Create a Blazor WebAssembly App in Visual Studio

You can create Blazor WebAssembly App using Visual Studio in one of the following ways,

Install Syncfusion Blazor Gantt NuGet in the App

Syncfusion Blazor components are available in nuget.org. To use Syncfusion Blazor components in the application, add reference to the corresponding NuGet. Refer to NuGet packages topic for available NuGet packages list with component details.

To add Blazor Gantt Chart component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.Gantt and then install it.

Register Syncfusion Blazor Service

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

@using Syncfusion.Blazor

Now, Open ~/Program.cs file and register the Syncfusion Blazor Service in the client web app. Here, Syncfusion Blazor Service is registered by setting IgnoreScriptIsolation property as true to load the scripts externally in the next steps.

From 2022 Vol-1 (20.1) version, the default value of IgnoreScriptIsolation is changed to true. It is not necessary to set the IgnoreScriptIsolation property to refer scripts externally, since the default value has already been changed to true, and this property is obsolete.

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();
....
using Syncfusion.Blazor;

namespace BlazorApplication
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            ....
            builder.Services.AddSyncfusionBlazor();
            await builder.Build().RunAsync();
        }
    }
}

Add Style Sheet

Checkout the Blazor Themes topic to learn different ways (Static Web Assets, CDN and CRG) to refer themes in Blazor application, and to have the expected appearance for Syncfusion Blazor components. Here, the theme is referred using Static Web Assets.

To add theme to the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.Themes and then install it. Then, the theme style sheet from NuGet can be referred inside the <head> of wwwroot/index.html file in client web app.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
</head>

Add Script Reference

Checkout Adding Script Reference topic to learn different ways to add script reference in Blazor Application. In this getting started walk-through, the required scripts are referred using Static Web Assets externally inside the <head> of wwwroot/index.html file in client web app.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="https://cdn.syncfusion.com/blazor/19.4.38/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

Syncfusion recommends to reference scripts using Static Web Assets, CDN and CRG by disabling JavaScript isolation for better loading performance of the Blazor application. Generate scripts and theme assets using CRG by selecting the components you were using in the application.

Add Blazor Gantt Chart component

  • Open ~/_Imports.razor file or any other page under the ~/Pages folder where the component is to be added and import the Syncfusion.Blazor.Gantt namespace.
@using Syncfusion.Blazor
@using Syncfusion.Blazor.Gantt
  • Now, add the Syncfusion Gantt Chart component in razor file. Here, the Gantt Chart component is added in the ~/Pages/Index.razor file under the ~/Pages folder.
<SfGantt TValue="TaskData">
</SfGantt>

@code{
    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public int? ParentId { get; set; }
    }
}

Binding Gantt Chart with Data

Bind data with the Gantt Chart component by using the DataSource property. It accepts an list objects or the DataManager instance.

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px">
</SfGantt>

@code{
private List<TaskData> TaskCollection { get; set; }
protected override void OnInitialized()
{
    this.TaskCollection = GetTaskCollection();
}

public class TaskData
{
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public string Duration { get; set; }
    public int Progress { get; set; }
    public int? ParentId { get; set; }
}

public static List<TaskData> GetTaskCollection()
{
    List<TaskData> Tasks = new List<TaskData>()
    {
        new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23)},
        new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId = 1 },
        new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId = 1 }
    };
    return Tasks;
}
}

Mapping Task Fields

The data source fields that are required to render the tasks are mapped to the Gantt Chart component using the GanttTaskFields property.

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress" ParentID="ParentId">
    </GanttTaskFields>
</SfGantt>

@code{
private List<TaskData> TaskCollection { get; set; }
protected override void OnInitialized()
{
    this.TaskCollection = GetTaskCollection();
}

public class TaskData
{
    public int TaskId { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public string Duration { get; set; }
    public int Progress { get; set; }
    public int? ParentId { get; set; }
}

private static List<TaskData> GetTaskCollection()
{
    List<TaskData> Tasks = new List<TaskData>()
    {
        new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23) },
        new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 },
        new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 }
    };
    return Tasks;
    }
}

Defining Columns

Gantt Chart has an option to define columns as an array. You can customize the Gantt Chart columns using the following properties:

  • Field : Maps the data source fields to the columns.
  • HeaderText : Changes the title of columns.
  • TextAlign : Changes the alignment of columns. By default, columns will be left aligned. To change the columns to right align, set TextAlign to right, TextAlign values are right, left, center, justify.
  • Format : Formats the number and date values to standard or custom formats. Here, it is defined for the conversion of numeric values to currency.
@using Syncfusion.Blazor.Gantt
@using Syncfusion.Blazor.Grids

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress"  ParentID="ParentId">
    </GanttTaskFields>
    <GanttColumns>
        <GanttColumn Field="TaskId" HeaderText="Task ID" TextAlign="TextAlign.Right" Width="100"></GanttColumn>
        <GanttColumn Field="TaskName" HeaderText="Task Name" Width="250"></GanttColumn>
        <GanttColumn Field="StartDate" HeaderText="Start Date" Width="250"></GanttColumn>
        <GanttColumn Field="Duration" HeaderText="Duration" Width="250"></GanttColumn>
        <GanttColumn Field="Progress" HeaderText="Progress" Format="@NumberFormat" Width="250"></GanttColumn>
    </GanttColumns>
</SfGantt>

@code{
    private List<TaskData> TaskCollection { get; set; }
    public string NumberFormat = "C";
    protected override void OnInitialized()
    {
        this.TaskCollection = GetTaskCollection();
    }

    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public int? ParentId { get; set; }
    }

    private static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>()
        {
            new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23), },
            new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 },
            new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 }
        };
        return Tasks;
    }
}

For further details regarding Columns, refer here.

Enable Editing

The editing feature enables you to edit the tasks in the Gantt Chart component. It can be enabled by using the EditSettings.AllowEditing and EditSettings.AllowTaskbarEditing properties.

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress" ParentID="ParentId">
    </GanttTaskFields>
    <GanttEditSettings AllowEditing="true" Mode="Syncfusion.Blazor.Gantt.EditMode.Auto" AllowTaskbarEditing="true"></GanttEditSettings>
</SfGantt>

@code{
    private List<TaskData> TaskCollection { get; set; }
    protected override void OnInitialized()
    {
        this.TaskCollection = GetTaskCollection();
    }

    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public int? ParentId { get; set; }
    }

    private static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>()
        {
            new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23), },
            new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 },
            new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 }
        };
        return Tasks;
    }
}

When the edit mode is set to Auto, you can change the cells to editable mode by double-clicking anywhere at the Tree Grid and edit the task details in the edit dialog by double-clicking anywhere at the chart.

You can find the full information regarding Editing from here

Enable Filtering

The filtering feature enables you to view the reduced amount of records based on filter criteria. Gantt Chart provides the menu filtering support for each column. It can be enabled by setting the AllowFiltering property to true. Filtering feature can also be customized using the FilterSettings property.

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px" AllowFiltering="true">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress" ParentID="ParentId">
    </GanttTaskFields>
</SfGantt>

@code{
    private List<TaskData> TaskCollection { get; set; }
    protected override void OnInitialized()
    {
        this.TaskCollection = GetTaskCollection();
    }

    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public int? ParentId { get; set; }
    }

    private static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>()
        {
            new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23), },
            new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 },
            new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 }
        };
        return Tasks;
    }
}

You can find the full information regarding Filtering from here

Enable Sorting

The sorting feature enables you to order the records. It can be enabled by setting the AllowSorting property to true. The sorting feature can be customized using the SortSettings property. To sort column values in ascending or descending order, double-click the column title.

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px" AllowSorting="true">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress" ParentID="ParentId">
    </GanttTaskFields>
</SfGantt>

@code{
    private List<TaskData> TaskCollection { get; set; }
    protected override void OnInitialized()
    {
        this.TaskCollection = GetTaskCollection();
    }

    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public int? ParentId { get; set; }
    }

    private static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>()
        {
            new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23), },
            new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 },
            new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1 }
        };
        return Tasks;
    }
}

You can find the full information regarding Sorting from here

Enabling Predecessors or Task Relationships

Predecessor or task dependency in the Gantt Chart component is used to depict the relationship between the tasks.

  • Start to Start (SS): You cannot start a task until the dependent task starts.
  • Start to Finish (SF): You cannot finish a task until the dependent task finishes.
  • Finish to Start (FS): You cannot start a task until the dependent task completes.
  • Finish to Finish (FF): You cannot finish a task until the dependent task completes.
    You can show the relationship in tasks by using the Dependency property as shown in the following code example.
<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px">
    <GanttTaskFields Id="TaskId" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress"  ParentID="ParentId" Dependency="Predecessor">
    </GanttTaskFields>
</SfGantt>

@code{
    private List<TaskData> TaskCollection { get; set; }
    protected override void OnInitialized()
    {
        this.TaskCollection = GetTaskCollection();
    }

    public class TaskData
    {
        public int TaskId { get; set; }
        public string TaskName { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public string Duration { get; set; }
        public int Progress { get; set; }
        public string Predecessor { get; set; }
        public int? ParentId { get; set; }
    }

    private static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>()
        {
            new TaskData() { TaskId = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 01, 04), EndDate = new DateTime(2022, 01, 23), },
            new TaskData() { TaskId = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1, Predecessor="1", },
            new TaskData() { TaskId = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 01, 04), Duration = "4", Progress = 50, ParentId=1, Predecessor="2", }
        };
        return Tasks;
    }
}

You can find the full information regarding Predecessors from here

Blazor WASM Gantt Chart Demonstration Video

Blazor Gantt Chart