$(document).ready(function () {
    $(".rupiah-format").on("keyup", function (e) {
        $(this).val(formatRupiah($(this).val(), "Rp"));
    });

    function formatRupiah(angka, prefix) {
        var number_string = angka.replace(/[^,\d]/g, "").toString(),
            split = number_string.split(","),
            sisa = split[0].length % 3,
            rupiah = split[0].substr(0, sisa),
            ribuan = split[0].substr(sisa).match(/\d{3}/gi);

        if (ribuan) {
            separator = sisa ? "." : "";
            rupiah += separator + ribuan.join(".");
        }

        rupiah = split[1] != undefined ? rupiah + "," + split[1] : rupiah;
        return prefix == undefined ? rupiah : rupiah ? "Rp" + rupiah : "";
    }
});