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add custom attribute to kendo combo box

How to add custom attribute to kendo combo-box?

HTML code-sample

<input id="cbbUsers" class="form-control"/>

JavaScript code-sample

<script type="text/javascript">
//BIND DEFAULT KENDO COMBOBOX.
    $("#cbbUsers").kendoComboBox({
        autoBind: true,
        cascadeFrom: "categories",
        filter: "contains",
        placeholder: "Select users...",
        dataTextField: "UserName",
        dataValueField: "UserId",
        select: onSelectUser,
        dataSource: {
            data: "api/users/GetUsers"
        }
    }).data("kendoComboBox");

  //OnSelect EVENT USER FUNCTION.
    function onSelectUser(e) {
        var oldVal= $("#cbbUsers").val();
        $("#cbbUsers").closest(".k-combobox").attr("oldVal", oldVal);
    };

</script>


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