/**
 * Shows a message.
 * 
 * @param {String} html - the HTML code of the message
 */
function msg(html) {
  $(".msg").alert('close');
  $(html).hide().appendTo("#msg-container").fadeIn("slow");
}

/**
 * Shows an error message for failing ajax requests.
 */
function noConnection() {
  var html = $("<div/>", {
    "class": "alert alert-error msg",
    "data-dismiss": "alert",
    "text": "Der Server ist nicht erreichbar. Die Aktion konnte nicht ausgeführt werden."
  });
  
  $("<h1/>", {
    "text": "Fehler!"
  }).prependTo(html);
    
  msg(html);
}

$(document).ajaxError(function(e, jqxhr, settings, exception) {
  // attach error handler to all ajax requests except autocomplete
  if (settings.url.indexOf("autocomplete") != -1) {
    noConnection();
  }
});

/**
 * Shows an error message for a form control.
 * 
 * @param {Object} data
 */
function error(data) {
  $('div[id$="-group"]').removeClass("error");
  $('.help-inline').remove();
  
  if (data.formErrors) {
    for (var i = 0; i < data.formErrors.length; i++) {
      var field = data.formErrors[i].field;
      var last = $("#" + field + "-group input:last");
      
      $("#" + field + "-group").addClass("error");
      
      $("<span/>", {
        "class": "help-inline",
        "text": data.formErrors[i].msg,
      }).appendTo("#" + field + "-group");
    }
  }  
}