Resize columns in Blazor Gantt Chart component

31 Oct 20257 minutes to read

The Syncfusion® Blazor Gantt Chart component allows you to resize columns dynamically by dragging the edges of column headers. This feature enhances readability and layout flexibility, especially when working with large datasets. To enable this feature, set the AllowResizing property to true in the Gantt configuration.

Column width can be adjusted by dragging the right edge of the header, with changes applied immediately.

@using Syncfusion.Blazor.Gantt

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px" AllowResizing="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; }
    }

    public static List<TaskData> GetTaskCollection()
    {
        List<TaskData> Tasks = new List<TaskData>() 
        {
            new TaskData() { TaskID = 1, TaskName = "Project initiation", StartDate = new DateTime(2022, 04, 05), EndDate = new DateTime(2022, 04, 08), },
            new TaskData() { TaskID = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 04, 05), Duration = "0", Progress = 30, ParentID = 1 },
            new TaskData() { TaskID = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 04, 05), Duration = "4", Progress = 40, ParentID = 1 },
            new TaskData() { TaskID = 4, TaskName = "Soil test approval", StartDate = new DateTime(2022, 04, 05), Duration = "0", Progress = 30, ParentID = 1 },
            new TaskData() { TaskID = 5, TaskName = "Project estimation", StartDate = new DateTime(2022, 04, 06), EndDate = new DateTime(2022, 04, 08), },
            new TaskData() { TaskID = 6, TaskName = "Develop floor plan for estimation", StartDate = new DateTime(2022, 04, 06), Duration = "3", Progress = 30, ParentID = 5 },
            new TaskData() { TaskID = 7, TaskName = "List materials", StartDate = new DateTime(2022, 04, 06), Duration = "3", Progress = 40, ParentID = 5 },
            new TaskData() { TaskID = 8, TaskName = "Estimation approval", StartDate = new DateTime(2022, 04, 06), Duration = "0", Progress = 30, ParentID = 5 }
        };
        return Tasks;
    }
}

  • In RTL mode, you can click and drag the left edge of header cell to resize the column.
  • The Width property of the column can be set initially to define the default width of the column. However, when column resizing is enabled, you can override the default width by manually resizing the columns.

Restrict the resizing based on minimum and maximum width

The Gantt chart component allows restricting column resizing within a defined range to maintain layout consistency. This ensures column widths remain within the specified limits during resizing.

To enable this, set the GanttColumn.MinWidth and GanttColumn.MaxWidth properties in the column configuration.

The following example demonstrates how the TaskName column can be configured with a minimum width of 150 pixels and a maximum of 250 pixels, while the Duration column can be set between 50 and 200 pixels.

@using Syncfusion.Blazor.Gantt

<SfGantt DataSource="@TaskCollection" Height="450px" Width="700px" AllowResizing="true">
    <GanttTaskFields Id="TaskID" Name="TaskName" StartDate="StartDate" EndDate="EndDate" Duration="Duration" Progress="Progress" ParentID="ParentID">
    </GanttTaskFields>
    <GanttColumns>
        <GanttColumn Field="TaskID" Width="50"></GanttColumn>
        <GanttColumn Field="TaskName" Width="200" MinWidth="150" MaxWidth="250"></GanttColumn>
        <GanttColumn Field="StartDate"></GanttColumn>
        <GanttColumn Field="Duration" Width="100" MinWidth="50" MaxWidth="200"></GanttColumn>
        <GanttColumn Field="Progress"></GanttColumn>
    </GanttColumns>
</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, 04, 05), EndDate = new DateTime(2022, 04, 08), },
            new TaskData() { TaskID = 2, TaskName = "Identify Site location", StartDate = new DateTime(2022, 04, 05), Duration = "0", Progress = 30, ParentID = 1 },
            new TaskData() { TaskID = 3, TaskName = "Perform soil test", StartDate = new DateTime(2022, 04, 05), Duration = "4", Progress = 40, ParentID = 1 },
            new TaskData() { TaskID = 4, TaskName = "Soil test approval", StartDate = new DateTime(2022, 04, 05), Duration = "0", Progress = 30, ParentID = 1 },
            new TaskData() { TaskID = 5, TaskName = "Project estimation", StartDate = new DateTime(2022, 04, 06), EndDate = new DateTime(2022, 04, 08), },
            new TaskData() { TaskID = 6, TaskName = "Develop floor plan for estimation", StartDate = new DateTime(2022, 04, 06), Duration = "3", Progress = 30, ParentID = 5 },
            new TaskData() { TaskID = 7, TaskName = "List materials", StartDate = new DateTime(2022, 04, 06), Duration = "3", Progress = 40, ParentID = 5 },
            new TaskData() { TaskID = 8, TaskName = "Estimation approval", StartDate = new DateTime(2022, 04, 06), Duration = "0", Progress = 30, ParentID = 5 }
        };
        return Tasks;
    }
}

Touch interaction

The Gantt Chart component supports touch interactions for mobile devices. Users can resize columns by tapping and dragging the floating handler, or use the column menu to autofit columns.

Resizing columns on touch devices:

To resize a column:

  1. Tap the right edge of the column header.
  2. A floating handler appears over the column right border.
  3. Drag the handler to adjust the column width.

The screenshot below illustrates column resizing on a touch device.

Column resize

You can refer to our Blazor Gantt Chart feature tour page for its groundbreaking feature representations. You can also explore our Blazor Gantt Chart example to know how to render and configure the Gantt Chart.