mvvm remote binding

HTML

<script src="http://cdn.kendostatic.com/2012.1.322/js/kendo.all.min.js"></script>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.1.322/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.1.322/styles/kendo.metro.min.css">
<div data-role="grid"
    data-sortable="true"
    data-columns='["ProductName", "QuantityPerUnit", "Discontinued"]'
    data-bind="source: gridSource">
</div>
<br />
<br />
<select data-role="dropdownlist"
    data-text-field="text" 
    data-value-field="index"
    data-option-label="Select City"
    data-bind="source: citySource, value: selectedCity">
</select>

<span data-bind="text: selectedCity.text"></span>

JavaScript

var gridSource = new kendo.data.DataSource({
    transport: {
        read: {
            //using jsfiddle echo service to simulate JSON endpoint
            url: "/echo/json/",
            dataType: "json",
            type: "POST",
            data: {
                // /echo/json/ echoes the JSON which you pass as an argument
                json: JSON.stringify([
                    {
                        "ProductName": "Chai", 
                        "QuantityPerUnit": 2.50,
                        "Discontinued": true
                    },
                    {
                        "ProductName": "Tofu", 
                        "QuantityPerUnit": 12.50,
                        "Discontinued": false
                    },
                    {
                        "ProductName": "Biscuits", 
                        "QuantityPerUnit": 22.50,
                        "Discontinued": false
                    }
                ])
            }
        }
    },
    schema: {
        model: {
            fields: {
                ProductName: { type: "string" },
                QuantityPerUnit: { type: "number" },
                Discontinued: { type: "boolean" }
            }
        }            
    }
});

var citySource = new kendo.data.DataSource({
    transport: {
        read: {
            //using jsfiddle echo service to simulate JSON endpoint
            url: "/echo/json/",
            dataType: "json",
            type: "POST",
            data: {
                // /echo/json/ echoes the JSON which you pass as an argument
                json: JSON.stringify([
                    {
                        "text": "London", 
                        "index": 1
                    },
                    {
                        "text": "Boston",
                        "index": 2
                    },
                    {
                        "text": "Miami",
                        "index": 3
                    }
                ])
   ...