Update Aggregates on Change
Environment
| Product | Progress® Kendo UI® Grid for jQuery |
Description
How can I re-draw only the Grid footer while the group footers show the new aggregates without rebinding the entire Grid?
Solution
To achieve the desired scenarion, use the following suggested implemetation. Note that upon changing the group fields, the Grid requires a full refresh.
<div id="grid"></div>
<script>
$(document).ready(function() {
var categories = [{
"value": 1,
"text": "Beverages"
},{
"value": 2,
"text": "Condiments"
},{
"value": 3,
"text": "Confections"
},{
"value": 4,
"text": "Dairy Products"
},{
"value": 5,
"text": "Grains/Cereals"
},{
"value": 6,
"text": "Meat/Poultry"
},{
"value": 7,
"text": "Produce"
},{
"value": 8,
"text": "Seafood"
}];
$("#grid").kendoGrid({
dataSource: {
type: "odata",
transport: {
read: "//demos.telerik.com/kendo-ui/service/Northwind.svc/Products"
},
schema:{
model: {
fields: {
ProductName: { type: "string" },
UnitPrice: { type: "number" },
UnitsOnOrder: { type: "number" },
CategoryID: { type: "number" }
}
}
},
pageSize: 20,
group: [{
field: "CategoryID", aggregates: [
{ field: "UnitPrice", aggregate: "sum" }
],
}, {
field: "UnitsOnOrder", aggregates: [
{ field: "UnitPrice", aggregate: "sum" }
]
}],
aggregate: [{ field: "UnitPrice", aggregate: "sum" }],
change: function (e) {
if (e.field && e.action == "itemchange") {
var grid = $("#grid").data("kendoGrid");
var model = e.items[0];
var groupFooterIndex = 0;
var groupFooters = grid.tbody.children(".k-group-footer");
function updateGroupFooters(items) {
var updatedSubGroup;
var updatedElement;
for (var idx = 0; idx < items.length; idx++) {
var item = items[idx];
if (item.hasSubgroups) {
updatedSubGroup = updateGroupFooters(item.items);
}
if (updatedSubGroup || $.inArray(model, item.items) !== -1) {
updatedElement = true;
groupFooters.eq(groupFooterIndex).replaceWith(grid.groupFooterTemplate(item.aggregates));
}
groupFooterIndex++;
}
return updatedElement;
}
updateGroupFooters(this.view());
grid.footer.find(".k-footer-template").replaceWith(grid.footerTemplate(this.aggregates()));
grid.refresh();
}
}
},
editable: true,
sortable: true,
scrollable: false,
pageable: true,
columns: [
{field: "CategoryID", title: "Category", values: categories, hidden: true},
{ field: "ProductName", title: "Product Name" },
{ field: "UnitPrice", title: "Unit Price", aggregates: ["sum"], footerTemplate: "Sum: #=sum#",
groupFooterTemplate: "Sum: #=sum#" }
]
});
});
</script>