function toggleDisplay(id) {
  let el = document.getElementById(id);
  let el_cs = getComputedStyle(el);
  
  if (el_cs.getPropertyValue('display') === 'none') {
    el.style.display = 'inline';
  } else {
    el.style.display = 'none';
  }
} 

function hideAllClass(classname) {
  
  const el = document.getElementsByClassName(classname);
  
  for(let i = 0; i < el.length ; i++) {
    el[i].style.display = '';
  }
}

function showSelect(selectId, prefix, hideClass = '') {
  if(hideClass != '') {
    hideAllClass(hideClass);
  }
  
  let selVal = document.getElementById(selectId).value;
  toggleId = prefix + selVal;
  if(document.getElementById(toggleId) !== null ) {
    toggleDisplay(toggleId);
  }
}

function confirmDelete(name) {
  return confirm('Delete ' + name + '?');
}