labelString|Function|Object(default: null)
Adds a label before the input. If the input has no id attribute, a generated id will be assigned. The string and the function parameters are setting the inner HTML of the label.
Example - create a label from a string
<select id="customers"></select>
<script>
$("#customers").kendoMultiSelect({
    dataTextField: "ContactName",
    dataValueField: "CustomerID",
    dataSource: {
        transport: {
            read: "https://demos.telerik.com/service/v2/core/Customers"
        },
        group: { field: "Country" }
    },
  label: "Customers"
});
</script>The function context (available through the keyword this) will be set to the widget instance.
Example - create a label from a function
<select id="customers"></select>
<script>
$("#customers").kendoMultiSelect({
    dataTextField: "ContactName",
    dataValueField: "CustomerID",
    dataSource: {
        transport: {
            read: "https://demos.telerik.com/service/v2/core/Customers"
        },
        group: { field: "Country" }
    },
  label: function() {
      return "Customers";
  }
});
</script>In this article