Kendo UI ComboBox Validate Input to List

Kendo UI ComboBox that validates the input value to the items in the selection list.

HTML

<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.2.710/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.2.710/styles/kendo.default.min.css">
<script src="http://cdn.kendostatic.com/2012.2.710/js/kendo.all.min.js"></script>
<input class="customerComboBox"></input>

CSS

.customerComboBox {
    width: 100px;
}
.customerList {
    width: 400px !important;
}
.customerId, .customerName {
    display: inline-block;
}
.customerId {
    width: 75px;
}
.error {
    background-color: Pink;
}

JavaScript

var _combobox = $(".customerComboBox").kendoComboBox({
    dataSource: {
        type: "odata",
        transport: {
            read: "http://services.odata.org/Northwind/Northwind.svc/Customers"
        }
    },
    dataTextField: "CompanyName",
    dataValueField: "CustomerID",
    template: "<div class='customerId'>${ data.CustomerID }</div>" +
              "<div class='customerName'>${ data.CompanyName }</div>"
}).data("kendoComboBox");

_combobox.list.addClass("customerList");

_combobox.input.on("blur", _combobox, function(e) {
    var inputField = $(e.currentTarget);
    var combobox = e.data;
    var found = false;
    var tooltip = "";
    
    if (inputField.val().length == 0) {
        found = true;
    } else {
        $.each(_combobox.dataSource._data, function(idx, customer) {
            if (customer.CustomerID === inputField.val()) {
                found = true;
                tooltip = customer.CompanyName;
                return false;
            }
        });
    }
    if (found == false) {
        e.preventDefault();
        $(e.currentTarget).addClass("error").removeAttr("title");
        setTimeout(function() {
            inputField.focus().select();
        }, 100);
    } else {
        $(e.currentTarget).removeClass("error").attr("title", tooltip);
    }
});