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How to: Implement a Summary Whose Value Depends upon an External Editor Value

The following example calculates a summary in the CategoryID column based on the value in the ASPxSpinEdit below it.

When an end user changes a spin editor value, the editor sends a custom callback to the server in the client-side NumberChanged event handler. In the server-side SummaryDisplayText event handler, the grid calculates the summary value and sets it to the e.Text parameter.

<dx:ASPxCardView ID="ASPxCardView1" KeyFieldName="CategoryID" ClientInstanceName="grid" 
                 AutoGenerateColumns="False"DataSourceID="AccessDataSource1" runat="server">
    <Settings ShowSummaryPanel="True" />
        <dx:CardViewTextColumn FieldName="CategoryID" ReadOnly="True" />
        <dx:CardViewTextColumn FieldName="CategoryName" />
        <dx:CardViewTextColumn FieldName="Description" />
        <dx:ASPxCardViewSummaryItem FieldName="CategoryID" SummaryType="Sum" />

<dx:ASPxSpinEdit ID="ASPxSpinEdit1" runat="server" Number="0" Height="21">
    <ClientSideEvents NumberChanged="function(s, e) {
    }" />
protected void ASPxCardView1_SummaryDisplayText(object sender, DevExpress.Web.ASPxCardViewSummaryDisplayTextEventArgs e) {
    if (e.Item.FieldName == "CategoryID")
        e.Text = string.Format("Sum = {0}", Convert.ToDouble(e.Value) * Convert.ToDouble(ASPxSpinEdit1.Value));