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V25.1
  • DxTreeList.SelectDataItem(Object, Boolean) Method

    Selects or deselects a row that corresponds to the specified data item.

    Namespace: DevExpress.Blazor

    Assembly: DevExpress.Blazor.v25.1.dll

    NuGet Package: DevExpress.Blazor

    Declaration

    public void SelectDataItem(
        object dataItem,
        bool selected = true
    )

    Parameters

    Name Type Description
    dataItem Object

    The data item.

    Optional Parameters

    Name Type Default Description
    selected Boolean True

    true to select the row; false to deselect the row.

    Remarks

    The following methods allow you to manage TreeList selection:

    Pass a data item to the SelectDataItem method to select the corresponding row. The method’s behavior depends on the selection mode:

    You can deselect a row in one of the following ways:

    • Call the DeselectDataItem method.
    • Call the SelectDataItem method and pass false as the second parameter.

    The following example selects and deselects the row that corresponds to the first data item:

    @inject EmployeeTaskService EmployeeTaskService
    
    <DxTreeList @ref="MyTreeList"
                Data="TreeListData"
                KeyFieldName="Id"
                ParentKeyFieldName="ParentId"
                AllowSelectRowByClick="true"
                @bind-SelectedDataItems="@SelectedDataItems">
        <Columns>
            <DxTreeListDataColumn FieldName="Name" Caption="Task" />
            <DxTreeListDataColumn FieldName="EmployeeName" />
            <DxTreeListDataColumn FieldName="StartDate" />
            <DxTreeListDataColumn FieldName="DueDate" />
        </Columns>
        <ToolbarTemplate>
            <DxToolbar>
                <Items>
                    <DxToolbarItem Click="() => MyTreeList.SelectDataItem(TreeListData.First())" Text="Select First Data Item" />
                    <DxToolbarItem Click="() => MyTreeList.DeselectDataItem(TreeListData.First())" Text="Deselect First Data Item" />
                </Items>
            </DxToolbar>
        </ToolbarTemplate>
    </DxTreeList>
    
    @code {
        ITreeList MyTreeList { get; set; }
        List<EmployeeTask> TreeListData { get; set; }
        IReadOnlyList<object> SelectedDataItems { get; set; }
    
        protected override void OnInitialized() {
            TreeListData = EmployeeTaskService.GenerateData();
        }
    }
    

    Blazor TreeList Select and Deselect Data Item

    For more information about selection in the TreeList component, refer to the following topic: Selection and Focus in Blazor TreeList.

    See Also