JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.kendostatic.com/2011.3.1129/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2011.3.1129/styles/kendo.default.min.css">
<script src="http://cdn.kendostatic.com/2011.3.1129/js/kendo.all.min.js"></script>
<div id="grid">
</div>
<div id="log"></div>

JavaScript

var data = [
    {
        ProductID: 1,
        ProductName: "ProductName 1",
        Amount: 1
    },
    {
        ProductID: 2,
        ProductName: "ProductName 2",
        Amount: 2
    }
];

function log(dataSource) {
    var log = $("#log");
    log.html(log.html() + "<br />" + dataSource.aggregates().Amount.sum);
}

$("#grid").kendoGrid({
    dataSource: {
        data: data,
        aggregate: [{ field: "Amount", aggregate: "sum" }],
        batch: true,
        pageSize: 1,
        schema: {
            model: {
                id: "ProductID",
                fields: {
                    ProductID: { editable: false, nullable: true },
                    ProductName: { validation: { required: true } },
                    Amount: { type: "number"} 
                }
            }
        }
    },
    editable: true,
    pageable: true,
    toolbar: ["create", "save", "cancel"],
    columns: [
        "ProductName", "Amount"
    ],
    save: function(e) {     
        var dataSource = this.dataSource;
        e.model.one("change", function() {
            dataSource.one("change", function() {
                log(dataSource);
            });
            dataSource.fetch();
        });
    }
});