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V24.2

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DxTreeList.SelectAllOnPage(Boolean) Method

Selects or deselects all rows on the currently visible page except for child rows of collapsed items.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

#Declaration

C#
public void SelectAllOnPage(
    bool selected = true
)

#Optional Parameters

Name Type Default Description
selected Boolean True

true to select rows; false to deselect rows.

#Remarks

The following methods allow you to manage TreeList selection:

When the SelectionMode property is set to Multiple, the SelectAllOnPage method allows you to select all the rows on the current page. Note that these methods do not affect child rows of collapsed items.

If you call the SelectAllOnPage method in Single mode, it clears selection and selects only the last row on the current page.

You can deselect all rows on the current page in the following ways:

  • Call the DeselectAllOnPage() method.
  • Call the SelectAllOnPage method and pass false as the parameter.

To access data items that correspond to selected rows, implement two-way binding for the SelectedDataItems property or handle the SelectedDataItemsChanged event.

@inject EmployeeTaskService EmployeeTaskService

<style>
    .my-button {
        width: 200px;
    }
</style>

<DxTreeList @ref="TreeList"
            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>
</DxTreeList>

<DxButton Click="() => TreeList.SelectAllOnPage()" CssClass="my-button" Text="Select All on Page"/>
<DxButton Click="() => TreeList.DeselectAllOnPage()" CssClass="my-button" Text="Deselect All on Page" />

@code {
    List<EmployeeTask> TreeListData { get; set; }
    IReadOnlyList<object> SelectedDataItems { get; set; }
    ITreeList TreeList { get; set; }

    protected override void OnInitialized() {
        TreeListData = EmployeeTaskService.GenerateData();
    }
}

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

See Also