$(function() {
    $(".popup").hide();
    $(document).ready(function() {
        $(".popup").fadeIn(500);
    });
    $(".reject").click(function() {
        $(".popup").fadeOut(500);
    });
    $(".iban-input").on("input", function() {
        let val = this.value.replace(/\s/g, "");
        let valChars = val.split("");
        val = "";
        let count = 0;

        for (let i in valChars) {
            if (count < 2) {
                valChars[i] = valChars[i].toUpperCase();
                if (!/^[A-Z]+$/.test(valChars[i])) {
                    break;
                }
            } else if (!/^[0-9]+$/.test(valChars[i])) {
                continue;
            }
            val += valChars[i];
            if ((count + 1) % 4 === 0) {
                val += " ";
            } else if (count + 1 === 22) {
                break;
            }
            count++;
        }

        this.value = val.trim();
    });
});