function clearChildren(element) {
    for (var i = 0; i < element.childNodes.length; i++) {
        var e = element.childNodes[i];
        if (e.tagName) switch (e.tagName.toLowerCase()) {
            case 'input':
                switch (e.type) {
                    case "radio":
                    case "checkbox": e.checked = false; break;
                    case "button":
                    case "submit":
                    case "image": break;
                    default: if (e.type !== "checkbox") { e.value = ''; } break;
                }
                break;
            case 'select': e.selectedIndex = 0; break;
            case 'textarea': e.innerHTML = ''; break;
            default: clearChildren(e);
        }
    }

    $(element).children().find('textarea').each(function () {
        $(this).val('');
    });

    $(element).children().find('select').each(function () {
        $(this).prop('selectedIndex', 0);
    });
}

$(document).ready(function () {

    $('.modal').on("hidden.bs.modal", function (e) {
        if ($('.modal:visible').length) {
            $('.modal-backdrop').first().css('z-index', parseInt($('.modal:visible').last().css('z-index')) - 10);
            $('body').addClass('modal-open');           
        }
        clearChildren(this);
    }).on("show.bs.modal", function (e) {
        if ($('.modal:visible').length) {
            $('.modal-backdrop.in').first().css('z-index', parseInt($('.modal:visible').last().css('z-index')) + 10);
            $(this).css('z-index', parseInt($('.modal-backdrop.in').first().css('z-index')) + 10);
        }
    });
});


function getRandom(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
};

function getRandomString(num) {
    var ret = '';

    for (var i = 1; i <= num; i++) {
        ret += Math.random().toString(36).substr(getRandom(4,12), 1);
    }

    return ret;
}