kendo grid dataSource

HTML

<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.2.918/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.2.918/styles/kendo.rtl.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.2.918/styles/kendo.default.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.2.918/styles/kendo.dataviz.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.2.918/styles/kendo.dataviz.default.min.css">
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://cdn.kendostatic.com/2013.2.918/js/kendo.all.min.js"></script>
<div id="grid"></div>
</br>
</br>
</br>
The Sum is:
 <label id="weight-label" ></label>

JavaScript

var data = [
    { item: "item1", weight: 15 },
    { item: "item2", weight: 22 },
    { item: "item3", weight: 43 },
    { item: "item4", weight: 37 },
    { item: "item5", weight: 33 }
];
$("#grid").kendoGrid({
    columns: [
        { field: "item" },
        { field: "weight" }
    ],
    filterable: true,						
    sortable: true,
    pageable: true,
    resizable:true,	
    selectable: "row",
    columnMenu: true,
    dataSource:data ,

});