Custom validations does not work in kendo ui grid update - validation

Question

here is my code......
In here I try to add custom validation to update.
<script>
$(document).ready(function () {
var crudServiceBaseUrl = "//demos.telerik.com/kendo-ui/service",
dataSource = new kendo.data.DataSource({
transport: {
read: {
url: crudServiceBaseUrl + "/Products",
dataType: "jsonp"
},
update: {
url: crudServiceBaseUrl + "/Products/Update",
dataType: "jsonp"
},
destroy: {
url: crudServiceBaseUrl + "/Products/Destroy",
dataType: "jsonp"
},
create: {
url: crudServiceBaseUrl + "/Products/Create",
dataType: "jsonp"
},
parameterMap: function (options, operation) {
if (operation !== "read" && options.models) {
return { models: kendo.stringify(options.models) };
}
}
},
batch: true,
pageSize: 20,
schema: {
model: {
id: "ProductID",
fields: {
ProductID: { editable: false, nullable: true },
ProductName: {
validation: {
required: true,
productnamevalidation: function (input) {
if (input.is("[name='ProductName']") && input.val() != "") {
input.attr("data-productnamevalidation-msg", "Product Name should start with capital letter");
return /^[A-Z]/.test(input.val());
}
return true;
}
}
},
UnitPrice: { type: "number", validation: { required: true, min: 1} },
Discontinued: { type: "boolean" },
UnitsInStock: { type: "number", validation: { unitValidations : function(input){
if ((input.val() <= 1000) && (input.val() >= 10)) {
input.attr("data-max-msg","value must in given range");
input.attr("data-min-msg","value must in given range");
return true;
} else {
return false;
} }, required: true} }
}
}
}
});
$("#grid").kendoGrid({
dataSource: dataSource,
pageable: true,
height: 550,
toolbar: ["create"],
columns: [
"ProductName",
{ field: "UnitPrice", title: "Unit Price", format: "{0:c}", width: "120px" },
{ field: "UnitsInStock", title: "Units In Stock", width: "120px" },
{ field: "Discontinued", width: "120px" },
{ command: ["edit", "destroy"], title: " ", width: "250px"}],
editable: "inline"
});
});
</script>
</div>
In here you can see I added custom validation for update field....
UnitsInStock: { type: "number", validation: { unitValidations : function(input){
if ((input.val() <= 1000) && (input.val() >= 10)) {
input.attr("data-max-msg","value must in given range");
input.attr("data-min-msg","value must in given range");
return true;
} else {
return false;
} }, required: true} }
But it is not working fine. What should I change ??
you can run this from here