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FileManagerDetailsCustomColumn.ShowHeaderFilterButton Property

Specifies whether a header filter button is displayed for the custom column.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v24.1.dll

NuGet Package: DevExpress.Web

Declaration

[DefaultValue(DefaultBoolean.Default)]
public DefaultBoolean ShowHeaderFilterButton { get; set; }

Property Value

Type Default Description
DefaultBoolean Default

true to display a header filter button; otherwise false.

Available values:

Name Description Return Value
True

The value is true.

0

False

The value is false.

1

Default

The value is specified by a global option or a higher-level object.

2

Remarks

Use the ShowHeaderFilterButton property to specify a custom column’s header filter availability. If the property is set to Default, the header filter availability is defined by the FileManagerFileListDetailsViewSettings.ShowHeaderFilterButton property.

To learn more about custom columns, see the Custom Columns topic.

Example

This code sample demonstrates how to populate a custom column’s header filter with custom items. For this purpose, the ASPxFileManager.DetailsViewCustomColumnHeaderFilterFillItems event is handled.

FileManager_CustomHeaderFilter

<dx:ASPxFileManager ID="ASPxFileManager1" runat="server" Width="800px" Height="400px" OnDetailsViewCustomColumnDisplayText="ASPxFileManager1_DetailsViewCustomColumnDisplayText" OnDetailsViewCustomColumnHeaderFilterFillItems="ASPxFileManager1_DetailsViewCustomColumnHeaderFilterFillItems">
    <Settings RootFolder="~\Files\" ThumbnailFolder="~\Thumb\" />
    <SettingsFileList View="Details">
        <DetailsViewSettings>
            <Columns>
                <dx:FileManagerDetailsColumn Caption=" " FileInfoType="Thumbnail" VisibleIndex="0">
                </dx:FileManagerDetailsColumn>
                <dx:FileManagerDetailsColumn Caption="Name" VisibleIndex="1">
                </dx:FileManagerDetailsColumn>
                <dx:FileManagerDetailsCustomColumn Caption="Extension" Name="FileExtension" VisibleIndex="2" ShowHeaderFilterButton="True">
                </dx:FileManagerDetailsCustomColumn>
            </Columns>
        </DetailsViewSettings>
    </SettingsFileList>
</dx:ASPxFileManager>
protected void ASPxFileManager1_DetailsViewCustomColumnHeaderFilterFillItems(object source, DevExpress.Web.FileManagerDetailsViewCustomColumnHeaderFilterFillItemsEventArgs e) {
    if (e.Column.Name != "FileExtension") return;
    e.Values.Clear();
    e.AddShowAll();
    e.AddValue("Media Files", string.Empty, "FileExtension = 'avi' or FileExtension = 'mp3' or FileExtension = 'jpg'");
    e.AddValue("Documents", string.Empty, "FileExtension = 'txt' or FileExtension = 'rtf' or FileExtension = 'xml'");
    e.AddValue("Photos", "jpg");
}
See Also