ASPxGridView.FindFilterCellTemplateControl(GridViewColumn, String) Method
Searches for the server control contained within the specified filter row cell template.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v24.2.dll
Declaration
Parameters
| Name | Type | Description |
|---|---|---|
| column | GridViewColumn | A GridViewColumn descendant that is a column within the ASPxGridView. |
| id | String | A String value that identifies the control within the specified filter cell. |
Returns
| Type | Description |
|---|---|
| Control | A Control object that is the control contained within the specified filter cell’s template. |
Example
In some cases, when the default filter row editor’s functionality is not enough, you can provide custom filter cell content using the GridViewColumn.FilterTemplate.
In this example, a default cell editor is replaced with the ASPxGridLookup control. The control’s ASPxClientEdit.ValueChanged client-side event is used to send a callback to the server side, invoking the grid’s ASPxGridView.CustomCallback event. In the event handler, a filter criteria is created and applied to the grid using the ASPxGridView.ApplyFilterToColumn method.
<head runat="server">
<title></title>
<script type="text/javascript">
function Lookup_ValueChanged(s, e) {
grid.PerformCallback("FilterByCategories");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div style="max-width: 960px">
<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>
<asp:AccessDataSource ID="ProductsDataSource" runat="server" DataFile="~/App_Data/nwind.mdb"
SelectCommand="SELECT * FROM [ProductReports]" />
<asp:AccessDataSource ID="CategoriesDataSource" runat="server" DataFile="~/App_Data/nwind.mdb"
SelectCommand="SELECT * FROM [Categories]" />
</div>
</form>
</body>
</html>
using DevExpress.Data.Filtering;
using DevExpress.Web;
public partial class _Default : System.Web.UI.Page {
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;
}
}