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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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link.. My Tech Blog - https://www.code-sample.com/ My Books - Book 1 and Book 2