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Columns

The column definitions are used as the DataSource schema in the TreeGrid. This plays a vital role in rendering column values in the required format. The treegrid operations such as sorting, filtering and searching etc. are performed based on column definitions. The Field property of the Columns is necessary to map the data source values in TreeGrid Columns.

  1. If the column Field is not specified in the dataSource, the column values will be empty.
  2. If the Field name contains “dot” operator, it is considered as complex binding.

TreeColumnIndex property denotes the column that is used to expand and collapse child rows.

Header Template

You can customize the header element by using the HeaderTemplate property.

razor
headertemplate.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("HeaderTemplate")
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
          col.Field("TaskName").HeaderTemplate("#projectName").Width(220).Add();
          col.Field("StartDate").HeaderTemplate("#dateTemplate").Format("yMd").TextAlign(TextAlign.Right).Add();
          col.Field("Duration").HeaderTemplate("#durationTemplate").TextAlign(TextAlign.Right).Add();
          col.Field("Progress").HeaderTemplate("#progressTemplate").TextAlign(TextAlign.Right).Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(0).Render()
)

<script type="text/x-template" id="projectName">
    <div>
        <div>
            <img src="images/__Task name.png" width="20" height="20" class="e-image" />  Task Name
        </div>
    </div>
</script>
<script type="text/x-template" id="dateTemplate">
    <div>
        <div>
            <img src="images/__Start name.png" width="20" height="20" class="e-image" />  Start Date
        </div>
    </div>
</script>
<script type="text/x-template" id="durationTemplate">
    <div>
        <div>
            <img src="images/__Duration.png" width="20" height="20" class="e-image" />  Duration
        </div>
    </div>
</script>
<script type="text/x-template" id="progressTemplate">
    <div>
        <div>
            <img src="images/__progress.png" width="20" height="20" class="e-image" />  Progress
        </div>
    </div>
</script>
public ActionResult HeaderTemplate()
  {
    var treeData = TreeGridHeader.GetDataSource();
    ViewBag.datasource = treeData;
    return View();
  }

Header text

By default, column header title is displayed from column Field value. To override the default header title, you have to define the HeaderText value.

razor
headerText.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("HeaderText").DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
        col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
        col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
        col.Field("StartDate").HeaderText("Start Date").Format("yMd").TextAlign(TextAlign.Right).Width(90).Add();
        col.Field("Duration").HeaderText("Duration").Width(80).TextAlign(TextAlign.Right).Add();

      }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult HeaderText()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

If both the Field and HeaderText are not defined in the column, the column renders with “empty” header text.

Format

To format cell values based on specific culture, use the Format property of Column. The TreeGrid uses Internalization library to format number and date values.

razor
formatting.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Formatting").AllowPaging()
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
        col.Field("ID").HeaderText("Order ID").Width(90).TextAlign(TextAlign.Right).Add();
        col.Field("Name").HeaderText("Order Name").Width(180).Add();
        col.Field("Price").HeaderText("Price").Format("yMd").TextAlign(TextAlign.Right).Width(90).Format("c2").Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult Formatting()
{
    var treeData = ShipmentData.GetShipmentData();
    ViewBag.datasource = treeData;
    return View();    
}

By default, the number and date values are formatted in en-US locale.

Number formatting

The number or integer values can be formatted using the below format strings.

Format Description
N Denotes numeric type.
C Denotes currency type.
P Denotes percentage type

Please refer to the link to know more about Number formatting.

Date formatting

You can format date values either using built-in date format string or custom format string.

For built-in date format you can specify Format property as string (Example: yMd). Please refer to the link to know more about Date formatting.

You can also use custom format string to format the date values. Some of the custom formats and the formatted date values are given in the below table.

Format Formatted value
{ type:‘date’, format:‘dd/MM/yyyy’ } 04/07/1996
{ type:‘date’, format:‘dd.MM.yyyy’ } 04.07.1996
{ type:‘date’, skeleton:‘short’ } 7/4/96
{ type: ‘dateTime’, format: ‘dd/MM/yyyy hh:mm a’ } 04/07/1996 12:00 AM
{ type: ‘dateTime’, format: ‘MM/dd/yyyy hh:mm:ss a’ } 07/04/1996 12:00:00 AM
razor
dateformatting.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("DateFormatting")
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("ID").HeaderText("Order ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("Name").HeaderText("Order Name").Width(180).Add();
         col.Field("OrderDate").HeaderText("Order Date").Format("yMd").TextAlign(TextAlign.Right).Width(90).Add();
         col.Field("Price").HeaderText("Price").TextAlign(TextAlign.Right).Width(80).Format("C2").Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult Dateformatting()
{
    var treeData = ShipmentData.GetShipmentData();
    ViewBag.datasource = treeData;
    return View();    
}

AutoFit specific columns

The autoFitColumns method resizes the column to fit the widest cell’s content without wrapping. You can autofit a specific column at initial rendering by invoking the autoFitColumns method in DataBound event.

razor
autofit.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("AutoFit").AllowResizing()
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(60).Add();
         col.Field("StartDate").HeaderText("Start Date").Format("yMd").TextAlign(TextAlign.Right).Width(120).Add();
         col.Field("Duration").HeaderText("Duration").Width(120).TextAlign(TextAlign.Right).Add();
         col.Field("Progress").HeaderText("Progress").Width(120).TextAlign(TextAlign.Right).Add();

       }).Height(315).DataBound("dataBound").ChildMapping("Children").TreeColumnIndex(1).Render()
)

<script>
    function dataBound(args) {
        var treegrid = document.getElementById("AutoFit").ej2_instances[0];
        treegrid.autoFitColumns(['TaskName']);
    }
</script>
public ActionResult AutoFit()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

You can autofit all the columns by invoking the autoFitColumns method without column names.

Reorder

Reordering can be done by drag and drop of a particular column header from one index to another index within the treegrid. To enable reordering, set the AllowReordering to true.

razor
reorder.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Reorder").AllowReordering()
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(80).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(200).Add();
               col.Field("Duration").HeaderText("Duration").Width(80).TextAlign(TextAlign.Right).Add();
               col.Field("Progress").HeaderText("Progress").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult Reorder()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

You can disable reordering a particular column by setting the AllowReordering of Column to false.

Reorder Multiple Columns

Multiple columns can be reordered at a time by using the reorderColumns method.

razor
reorderbyColumn.cs
@using Syncfusion.EJ2.Grids

@Html.EJS().Button("reorderMultipleCols").Content("Reorder Multiple Columns").Render()

@(Html.EJS().TreeGrid("Reorder").AllowReordering()
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
               col.Field("Duration").HeaderText("Duration").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("Progress").HeaderText("Progress").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)

<script>
    document.getElementById("reorderMultipleCols").addEventListener('click', () => {
        var treegrid = document.getElementById("Reorder").ej2_instances[0];
        treegrid.reorderColumns(['TaskId', 'Duration'], 'Progress');

    });

</script>
public ActionResult reorderMultipleCols()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Lock Columns

You can lock columns by using LockColumn property of Column. The locked columns will be moved to the first position. Also you can’t reorder its position.

In the below example, Duration column is locked and its reordering functionality is disabled.

Column resizing

Column width can be resized by clicking and dragging the right edge of the column header. While dragging, the width of the respective column will be resized immediately. Each column can be auto resized by double-clicking the right edge of the column header to fit the width of that column based on the widest cell content. To enable column resize, set the AllowResizing property to true.

razor
resizing.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Resize").AllowResizing()
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
               col.Field("Duration").HeaderText("Duration").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("Progress").HeaderText("Progress").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult Resize()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

You can disable resizing for a particular column by setting the AllowResizing property of Column to false. In RTL mode, you can click and drag the left edge of the header cell to resize the column.

Min and max width

Column resize can be restricted between minimum and maximum width by defining the MinWidth and MaxWidth in Column API.

In the following sample, minimum and maximum width are defined for Duration, and Task Name columns.

razor
minmax.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Minmax").AllowResizing()
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(180).MinWidth(170).MaxWidth(250).Add();
               col.Field("Duration").HeaderText("Duration").Width(80).MinWidth(50).MaxWidth(150).TextAlign(TextAlign.Right).Add();
               col.Field("Progress").HeaderText("Progress").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult Minmax()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Resize Stacked Column

Stacked columns can be resized by clicking and dragging the right edge of the stacked column header. While dragging, the width of the respective child columns will be resized at the same time. You can disable resize for particular stacked column by setting AllowResizing as false to its columns.

razor
stackedresize.cs
@(Html.EJS().TreeGrid("StackedResize").AllowResizing().DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.HeaderText("Order Details").Columns(
                   new List<Syncfusion.EJ2.TreeGrid.TreeGridColumn>() {
                       new Syncfusion.EJ2.TreeGrid.TreeGridColumn { Field = "ID", Width = "90",
                       HeaderText = "Order ID",
                       TextAlign =Syncfusion.EJ2.Grids.TextAlign.Right
                   },
                   new Syncfusion.EJ2.TreeGrid.TreeGridColumn { Field = "Name", Width = "170",
                       HeaderText = "Order Name"
                   },
               }).Add();
               col.HeaderText("Shipment Details").Columns(
                   new List<Syncfusion.EJ2.TreeGrid.TreeGridColumn>() {
                       new Syncfusion.EJ2.TreeGrid.TreeGridColumn { Field = "ShipmentCategory", Width = "90",
                       HeaderText = "Category"
                   },
                   new Syncfusion.EJ2.TreeGrid.TreeGridColumn { Field = "ShippedDate", Width = "90",
                       HeaderText = "Shipped Date", TextAlign=Syncfusion.EJ2.Grids.TextAlign.Right,
                       Format = "yMd"
                   }
               }).Add();

             }).Height(260).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult StackedResize()
{
    var treeData = ShipmentData.GetShipmentData();
    ViewBag.datasource = treeData;
    return View();    
}

Touch interaction

When the right edge of the header cell is tapped, a floating handler will be visible over the right border of the column. To resize the column, tap and drag the floating handler as needed.

The following screenshot represents the column resizing in touch device.

Touch interaction image

Column template

The column Template has options to display custom element instead of a field value in the column.

razor
column-template.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("ColumnTemplate").DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("EmployeeID").HeaderText("Employee ID").Width(95).Add();
               col.Field("Name").HeaderText("Name").Width(110).Add();
               col.Field("DOB").HeaderText("DOB").Format("yMd").TextAlign(TextAlign.Right).Width(90).Add();
               col.HeaderText("Year GR").Template("#columnTemplate3").Width(120).TextAlign(TextAlign.Center).Add();

             }).Height(260).Width("auto").ChildMapping("Children").RowHeight(83).RowDataBound("rowDataBound")
               .TreeColumnIndex(0).Render()
)

<script type="text/x-template" id="columnTemplate3">
    <div id="spkwl${EmployeeID}"></div>
</script>

<script>

    var columnData = [
        [0, 6, -4, 1, -3, 2, 5],
        [5, -4, 6, 3, -1, 2, 0],
        [6, 4, 0, 3, -2, 5, 1],
        [4, -6, 3, 0, 1, -2, 5],
        [3, 5, -6, -4, 0, 1, 2],
        [1, -3, 4, -2, 5, 0, 6],
        [2, 4, 0, -3, 5, -6, 1],
        [5, 4, -6, 3, 1, -2, 0],
        [0, -6, 4, 1, -3, 2, 5],
        [6, 4, 0, -3, 2, -5, 1],
        [4, 6, -3, 0, 1, 2, 5],
        [3, -5, -6, 4, 0, 1, 2],
        [1, 3, -4, -2, 5, 0, 6],
        [2, -4, 0, -3, 5, 6, 1],
        [5, 4, -6, 3, 1, -2, 0],
        [0, 6, 4, -1, -3, 2, 5],
        [6, -4, 0, -3, 2, 5, 1],
        [4, 6, -3, 0, -1, 2, 5],
        [6, 4, 0, -3, 2, -5, 1],
        [3, 5, 6, -4, 0, 1, 2],
        [1, 3, -4, 2, -5, 0, 6]
    ];

    function rowDataBound(args) {

        var winloss = new ej.charts.Sparkline({
            height: '50px',
            width: '150px',
            type: 'WinLoss',
            valueType: 'Numeric',
            fill: '#3C78EF',
            tiePointColor: 'darkgray',
            negativePointColor: '#f7a816',
            dataSource: columnData[args.data.EmployeeID]
        });
        winloss.appendTo(args.row.querySelector('#spkwl' + args.data.EmployeeID));
    }

</script>
public ActionResult ColumnTemplate()
{
    var treeData = TreeGridItems.GetTemplateData();
    ViewBag.datasource = treeData;
    return View();    
}

TreeGrid actions such as editing, filtering and sorting etc. will depend upon the column Field. If the Field is not specified in the template column, the treegrid actions cannot be performed.

Using condition template

You can render the template elements based on condition.

In the following code, checkbox is rendered based on Approved field value.

  <script id="template" type="text/x-template">
            <div class="template_checkbox">
                ${if(approved)}
                <input type="checkbox" checked> ${else}
                <input type="checkbox"> ${/if}
            </div>
        </script>
razor
using-condition-template.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Condition").AllowResizing()
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
               col.HeaderText("Approved").Template("#template").TextAlign(TextAlign.Center).Width(120).Add();
               col.Field("Progress").HeaderText("Progress").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)

<script id="template" type="text/x-template">
    <div class="template_checkbox">
        ${if(Approved)}
        <input type="checkbox" checked> ${else}
        <input type="checkbox"> ${/if}
    </div>
</script>
public ActionResult Condition()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Column type

Column type can be specified using the Type property in Column. It specifies the type of data the column binds.

If the Format is defined for a column, the column uses Type to select the appropriate format option (number or date).

TreeGrid column supports the following types:

  • string
  • number
  • boolean
  • date
  • datetime

If the Type is not defined, it will be determined from the first record of the DataSource.

Column menu

The column menu has options to integrate features like sorting, filtering, and autofit. It will show a menu with the integrated feature when users click on multiple icon of the column. To enable column menu, you need to define the ShowColumnMenu property as true.

The default items are displayed in following table.

Item Description
SortAscending Sort the current column in ascending order.
SortDescending Sort the current column in descending order.
AutoFit Auto fit the current column.
AutoFitAll Auto fit all columns.
Filter Show the filter option as given in filterSettings.type
razor
columnmenu.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("ColumnMenu").AllowFiltering().AllowSorting().AllowResizing()
      .ShowColumnMenu()
      .PageSettings(p => p.PageSize(10))
      .FilterSettings(f => f.Type(Syncfusion.EJ2.TreeGrid.FilterType.Menu))
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
         col.Field("StartDate").HeaderText("Start Date").Format("yMd").TextAlign(TextAlign.Right).Width(90).Add();
         col.Field("Duration").HeaderText("Duration").Width(80).Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult ColumnMenu()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

You can disable column menu for a particular column by defining the ShowColumnMenu in Column as false.

Checkbox Column

To render checkboxes in existing column, you need to set ShowCheckbox property as true.

It is also possible to select the rows hierarchically using checkboxes in TreeGrid by enabling AutoCheckHierarchy property. When we check on any parent record checkbox then the child record checkboxes will get checked.

razor
checkbox.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("CheckboxSelection")
            .Height(400)
            .DataSource((IEnumerable<object>)ViewBag.datasource)
            .AutoCheckHierarchy(true)
            .Columns(col =>
            {
                col.Field("TaskId").HeaderText("Task ID").Width(110).TextAlign(TextAlign.Right).Add();
                col.Field("TaskName").HeaderText("Task Name").ShowCheckbox(true).Width(210).Add();
                col.Field("StartDate").HeaderText("Start Date").TextAlign(TextAlign.Right).Format("yMd").Width(210).Add();
                col.Field("Duration").HeaderText("Duration").TextAlign(TextAlign.Right).Width(190).Add();
            })
            .ChildMapping("Children").TreeColumnIndex(1).Render()
)
public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Responsive columns

You can toggle column visibility based on media queries which are defined at the HideAtMedia. The HideAtMedia accepts valid Media Queries.

razor
responsive-columns.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("ResponsiveColumns")
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskID").HeaderText("Task ID").Width(90).HideAtMedia("max-width: 700px").TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
         col.Field("StartDate").HeaderText("Start Date").Format("yMd").TextAlign(TextAlign.Right).Width(120).Add();
         col.Field("Duration").HeaderText("Duration").HideAtMedia("max-width: 500px").Width(80).TextAlign(TextAlign.Right).Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult ResponsiveColumns()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Controlling TreeGrid actions

You can enable or disable treegrid action for a particular column by setting the AllowFiltering, and AllowSorting properties in Column.

razor
gridaction.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("GridAction").AllowFiltering().AllowSorting()
      .DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskId").HeaderText("Task ID").Width(90).AllowSorting(false).TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
         col.Field("StartDate").HeaderText("Start Date").Format("yMd").AllowFiltering(false).TextAlign(TextAlign.Right).Width(90).Add();
         col.Field("Duration").HeaderText("Duration").Width(80).Add();

       }).Height(270).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult GridAction()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Show/hide columns by external button

You can show or hide treegrid columns dynamically using external buttons by invoking the showColumns or hideColumns method.

razor
showhide.cs
@using Syncfusion.EJ2.Grids

@Html.EJS().Button("button1").Content("SHOW").Render()

@Html.EJS().Button("button2").Content("HIDE").Render()

@(Html.EJS().TreeGrid("ShowHide").DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
               col.Field("StartDate").HeaderText("Start Date").Format("yMd").TextAlign(TextAlign.Right).Width(120).Add();
               col.Field("Duration").HeaderText("Duration").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(270).ChildMapping("Children").TreeColumnIndex(1).Render()
)

<script>
    document.getElementById("button1").addEventListener('click', () => {
        var treegrid = document.getElementById("ShowHide").ej2_instances[0];
        treegrid.showColumns(['Task ID', 'Duration']); //show by HeaderText
    });
    document.getElementById("button2").addEventListener('click', () => {
        var treegrid = document.getElementById("ShowHide").ej2_instances[0];
        treegrid.hideColumns(['Task ID', 'Duration']); //hide by HeaderText
    });
</script>
public ActionResult ShowHide()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Complex data binding

You can achieve complex data binding in the treegrid by using the dot(.) operator in the Field in Column.

razor
complexbinding.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("ComplexBinding").DataSource((IEnumerable<object>)ViewBag.datasource)
            .Columns(col =>
             {
               col.Field("taskID").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("taskName").HeaderText("Task Name").Width(180).Add();
               col.Field("assignee.firstname").HeaderText("Duration").Width(90).TextAlign(TextAlign.Right).Add();
               col.Field("duration").HeaderText("Duration").Width(80).TextAlign(TextAlign.Right).Add();

             }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult ComplexBinding()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

ValueAccessor

The ValueAccessor is used to access/manipulate the value of display data. You can achieve custom value formatting by using the ValueAccessor.

razor
value.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Value").DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
      {
          col.Field("orderID").HeaderText("Order ID").Width(90).TextAlign(TextAlign.Right).Add();
          col.Field("orderName").HeaderText("Order Name").Width(180).ValueAccessor("orderFormatter").Add();
          col.Field("orderDate").HeaderText("Order Date").Format("yMd").TextAlign(TextAlign.Right).Width(90).Add();
          col.Field("price").HeaderText("Price").ValueAccessor("currencyFormatter").TextAlign(TextAlign.Right).Width(80).Add();

      }).Height(315).ChildMapping("subTasks").TreeColumnIndex(1).Render()
)

<script>
    function currencyFormatter(field, data, column) {
        return '€' + data['price'];
    }

    function orderFormatter(field, data, column) {
        return data[field] + '-' + data['category'];
    }
</script>
public ActionResult Value()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Display array type columns

You can bind an array of objects in a column by using the ValueAccessor property. In this example, the name field has an array of two objects, FirstName and LastName. These two objects are joined and bound to a column using the ValueAccessor.

razor
valuearray.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("ValueArray").DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
         col.Field("name").HeaderText("Assignee").Width(90).ValueAccessor("orderFormatter").TextAlign(TextAlign.Right).Add();
         col.Field("Duration").HeaderText("Duration").Width(80).TextAlign(TextAlign.Right).Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)

<script>
    function orderFormatter(field, data, column) {
        return data[field].map(function (s) {
            return s.lastName || s.firstName
        }).join(' ');
    }
</script>
public ActionResult ValueArray()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}

Expression column

You can achieve the expression column by using the ValueAccessor property.

razor
expression.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("Expression").DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("orderID").HeaderText("Order ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("orderName").HeaderText("Order Name").Width(180).Add();
         col.Field("units").HeaderText("Units").TextAlign(TextAlign.Right).Width(90).Add();
         col.Field("unitPrice").HeaderText("Unit Price").TextAlign(TextAlign.Right).Width(80).Format("c2").Add();
         col.Field("price").HeaderText("Price").TextAlign(TextAlign.Right).ValueAccessor("totalPrice").Width(80).Format("c2").Add();

       }).Height(315).ChildMapping("subTasks").TreeColumnIndex(1).Render()
)

<script>
    function totalPrice(field, data, column) {
        return data.units * data.unitPrice;
    };
</script>
public ActionResult Expression()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();
}

How to render boolean values as checkbox

To render boolean values as checkbox in columns, you need to set DisplayAsCheckBox property as true.

razor
displayascheckbox.cs
@using Syncfusion.EJ2.Grids

@(Html.EJS().TreeGrid("DisplayAsCheckbox").DataSource((IEnumerable<object>)ViewBag.datasource)
      .Columns(col =>
       {
         col.Field("TaskId").HeaderText("Task ID").Width(90).TextAlign(TextAlign.Right).Add();
         col.Field("TaskName").HeaderText("Task Name").Width(180).Add();
         col.Field("Approved").HeaderText("Approved").DisplayAsCheckBox(true).Width("90").Add();
         col.Field("Duration").HeaderText("Duration").Width(80).Add();

       }).Height(315).ChildMapping("Children").TreeColumnIndex(1).Render()
)
public ActionResult DisplayAsCheckbox()
{
    var treeData = TreeGridItems.GetTreeData();
    ViewBag.datasource = treeData;
    return View();    
}