IW4M-Admin/WebfrontCore/wwwroot/js/configuration.js

$(document).ready(function() {
    $.each($('.has-related-content'), function (key, value) {
        value = $(value);
        if (value.attr('checked') !== undefined && value.attr('checked').length > 0) {
            $(value.data('related-content')).slideDown();
        }
    });

    $('input:checkbox').change(function () {
        var isChecked = $(this).is(':checked');
        isChecked ? $($(this).data('related-content')).slideDown() : $($(this).data('related-content')).slideUp();
    });

    $('.configuration-add-new').click(function (e) {
        e.preventDefault();
        //let totalItems = $(this).siblings().length;
        //let inputHtml = $(this).siblings().last().get(0).outerHTML;
        //inputHtml = inputHtml.replace('_' + totalItems - 1 + '_', '_' + totalItems + '_');
        //inputHtml = inputHtml.replace('[' + totalItems - 1 + ']', '[' + totalItems + ']');
        //$(this).parent().prepend(inputHtml);

        let parentElement = $(this).parent();

        $.get($(this).attr('href') + '&itemCount=' + $(this).siblings().length, function (response) {
            parentElement.prepend(response);
        });
    });
});