<div id="spreadsheet"></div>
<script>
var spreadsheet = $("#spreadsheet").kendoSpreadsheet({
    sheets: [
        { name: "Sheet1" },
        { name: "Sheet2" },
        { name: "Sheet3" }
    ]
}).data("kendoSpreadsheet");

var allSheets = spreadsheet.sheets();
console.log("Total sheets:", allSheets.length);
</script>