groupable.showFooter Boolean (default: false)

When enabled the group footer rows will remain visible when the corresponding group is collapsed.

Example - show footer when groups are collapsed

<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "productName", groupFooterTemplate: "this is a footer" },
    { field: "category" }
  ],
  dataSource: [
    { productName: "Tea", category: "Beverages" },
    { productName: "Beer", category: "Beverages" },
    { productName: "Cheese", category: "Food" },
  ],
  groupable: {
    showFooter: true
  }
});
</script>