class UIUtils { static show(element) { element.style.display = "block"; } static hide(element) { element.style.display = "none"; } static disableButton(button) { button.disabled = true; } static enableButton(button) { button.disabled = false; } static instantiateTemplate(templateId) { return document.getElementById(templateId).content.firstElementChild.cloneNode(true); } static clear(container) { container.replaceChildren(); } static getSelectedOption(selectElement) { return selectElement.options[selectElement.selectedIndex]; } }