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Sorting

Sorting enables you to sort data in Ascending or Descending order. To sort a column, click the column header.

To sort multiple columns, press and hold the CTRL key and click the column header. You can clear sorting of any one of the multi-sorted columns by pressing and holding the SHIFT key and clicking the specific column header.

To enable sorting in the TreeGrid, set the allowSorting property to true. Sorting options can be configured through the e-treegrid-sortsettings tag helper.

tagHelper
defaultSorting.cs
<ejs-treegrid id="TreeGrid" allowSorting="true" dataSource="@ViewBag.datasource" height="315" childMapping="subTasks" treeColumnIndex="1" allowPaging="true">
    <e-treegrid-columns>
        <e-treegrid-column field="category" headerText="Category" width="90"></e-treegrid-column>
        <e-treegrid-column field="orderName" headerText="Order Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="orderDate" headerText="Order Date" textAlign="Right" format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="units" headerText="Units" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

TreeGrid columns are sorted in the Ascending order. If you click the already sorted column, the sort direction toggles. You can apply and clear sorting by invoking sortColumn and clearSorting methods. To disable sorting for a particular column, set the allowSorting property of e-treegrid-column tag helper to false.

Initial sort

To sort at initial rendering, set the field and direction in the columns property of e-treegrid-sortsettings tag helper.

tagHelper
initialSort.cs
@{
    List<object> cols = new List<object>();
    cols.Add(new { field = "category", direction = "Ascending" });
    cols.Add(new { field = "orderName", direction = "Descending" });
}

<ejs-treegrid id="TreeGrid" allowSorting="true" dataSource="@ViewBag.datasource" height="315" childMapping="subTasks" treeColumnIndex="1">
    <e-treegrid-sortsettings columns="cols"></e-treegrid-sortsettings>
    <e-treegrid-columns>
        <e-treegrid-column field="category" headerText="Category" width="90"></e-treegrid-column>
        <e-treegrid-column field="orderName" headerText="Order Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="orderDate" headerText="Order Date" textAlign="Right" format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="units" headerText="Units" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>
public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

Sorting events

During the sort action, the treegrid component triggers two events. The actionBegin event triggers before the sort action starts, and the actionComplete event triggers after the sort action is completed. Using these events you can perform the needed actions.

tagHelper
eventHandlers.cs
<ejs-treegrid id="TreeGrid" allowSorting="true" dataSource="@ViewBag.datasource" height="315" childMapping="subTasks" actionBegin="actionHandler" actionComplete="actionHandler" treeColumnIndex="1">
    <e-treegrid-columns>
        <e-treegrid-column field="category" headerText="Category" width="90"></e-treegrid-column>
        <e-treegrid-column field="orderName" headerText="Order Name" width="180"></e-treegrid-column>
        <e-treegrid-column field="orderDate" headerText="Order Date" textAlign="Right" format="yMd" width="90"></e-treegrid-column>
        <e-treegrid-column field="units" headerText="Units" textAlign="Right" width="80"></e-treegrid-column>
    </e-treegrid-columns>
</ejs-treegrid>

<script>
    function actionHandler(args) {
        alert(args.requestType + ' ' + args.type); //custom Action
    }
</script>
public IActionResult Index()
{
    var tree = TreeData.GetDefaultData();
    ViewBag.datasource = tree;
    return View();
}

The args.requestType is the current action name. For example, in sorting the args.requestType value is sorting.

Touch interaction

When you tap the treegrid header on touchscreen devices, the selected column header is sorted. A popup Multi column sorting is displayed for multi-column sorting. To sort multiple columns, tap the popupMulti sorting, and then tap the desired treegrid headers.

The following screenshot shows treegrid touch sorting.

Touch interaction