GridViewColumn.FilterTemplate Property

Specifies a template to display the column’s filter row cell.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

[DefaultValue(null)]
public virtual ITemplate FilterTemplate { get; set; }

VB.NET

<DefaultValue(Nothing)>
Public Overridable Property FilterTemplate As ITemplate

Property Value

Type	Default	Description
ITemplate	null	An object that implements the ITemplate interface.

Remarks

Set the ShowFilterRow property to true to show the filter row.

When you specify the FilterTemplate property, the control creates a template within a container object of the GridViewFilterCellTemplateContainer type.

At the control level, use the GridViewTemplates.FilterRow or GridViewTemplates.FilterCell property to create a template for the filter row or a filter row cell.

Example

In the example below, the filter row cell template contains the ASPxGridLookup control.

Create a custom filter criteria and use the ApplyFilterToColumn(GridViewDataColumn, CriteriaOperator) method to apply this filter to the grid.

View Example: Use ASPxGridLookup as a filter row editor within a filter row cell template

ASPX

<dx:ASPxGridView runat="server" ID="Grid" AutoGenerateColumns="False" DataSourceID="ProductsDataSource"
    ClientInstanceName="grid" OnCustomCallback="Grid_CustomCallback" EnableViewState="false">
    <Columns>
        <dx:GridViewDataTextColumn FieldName="CategoryName">
            <FilterTemplate>
                <dx:ASPxGridLookup runat="server" ID="Lookup" AutoGenerateColumns="False" DataSourceID="CategoriesDataSource"
                    KeyFieldName="CategoryID" SelectionMode="Multiple" TextFormatString="{0}">
                    <Columns>
                        <dx:GridViewCommandColumn ShowSelectCheckbox="true" />
                        <dx:GridViewDataTextColumn FieldName="CategoryName" />
                        <dx:GridViewDataBinaryImageColumn FieldName="Picture">
                            <PropertiesBinaryImage ImageWidth="48" />
                        </dx:GridViewDataBinaryImageColumn>
                    </Columns>
                    <ClientSideEvents ValueChanged="Lookup_ValueChanged" />
                </dx:ASPxGridLookup>
            </FilterTemplate>
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="ProductName" />
        <dx:GridViewDataTextColumn FieldName="ProductSales" />
        <dx:GridViewDataDateColumn FieldName="ShippedDate" />
    </Columns>
    <Settings ShowFilterRow="true" />
</dx:ASPxGridView>

JS

function Lookup_ValueChanged(s, e) {
    grid.PerformCallback("FilterByCategories");
}

C#

protected void Grid_CustomCallback(object sender, ASPxGridViewCustomCallbackEventArgs e) {
    if(e.Parameters == "FilterByCategories") {
        var column = Grid.DataColumns["CategoryName"];
        var lookup = Grid.FindFilterCellTemplateControl(column, "Lookup") as ASPxGridLookup;
        if(lookup != null)
            Grid.ApplyFilterToColumn(column, CreateCriteria(lookup, column.FieldName));
    }
}

protected CriteriaOperator CreateCriteria(ASPxGridLookup gridLookup, string fieldName) {
    var values = gridLookup.GridView.GetSelectedFieldValues(fieldName);
    return values.Count > 0 ? new InOperator(fieldName, values) : null;
}

VB.NET

Protected Sub Grid_CustomCallback(ByVal sender As Object, ByVal e As ASPxGridViewCustomCallbackEventArgs)
    If e.Parameters = "FilterByCategories" Then
        Dim column = Grid.DataColumns("CategoryName")
        Dim lookup = TryCast(Grid.FindFilterCellTemplateControl(column, "Lookup"), ASPxGridLookup)
        If lookup IsNot Nothing Then
            Grid.ApplyFilterToColumn(column, CreateCriteria(lookup, column.FieldName))
        End If
    End If
End Sub

Protected Function CreateCriteria(ByVal gridLookup As ASPxGridLookup, ByVal fieldName As String) As CriteriaOperator
    Dim values = gridLookup.GridView.GetSelectedFieldValues(fieldName)
    Return If(values.Count > 0, New InOperator(fieldName, values), Nothing)
End Function