editor & dataSource

HTML

<script src="http://cdn.kendostatic.com/2012.1.515/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.default.min.css">
<textarea id="editor"></textarea>
<input type="button" id="btnFill" value="Insert Content" onclick="insert();" />

CSS

textarea {
 width: 100%;
 height: 350px;
}

JavaScript

var dataSource = 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: [
                    {"MSDescription":"<i>content from dataSource</i>"}
                ])
            }
        }
    }
});
    
$("#editor").kendoEditor();
dataSource.read(); //reads the dataSource

function insert() {
    var editor = $("#editor").data("kendoEditor"); //reference the editor
    var content = dataSource.at(0).MSDescription;
    editor.value(content);
}