How to use the vis-util.hasParent function in vis-util

var customTime = CustomTime.customTimeFromTarget(event);

  var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var time = this._toTime(x);
  var snappedTime = snap ? snap(time, scale, step) : time;

  var element = util.getTarget(event);
  var what = null;
  if (item != null)                                                    {what = 'item';}
  else if (customTime != null)                                         {what = 'custom-time';}
  else if (util.hasParent(element, this.timeAxis.dom.foreground))      {what = 'axis';}
  else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {what = 'axis';}
  else if (util.hasParent(element, this.itemSet.dom.labelSet))         {what = 'group-label';}
  else if (util.hasParent(element, this.currentTime.bar))              {what = 'current-time';}
  else if (util.hasParent(element, this.dom.center))                   {what = 'background';}

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime
  }
};

var item  = this.itemSet.itemFromTarget(event);
  var group = this.itemSet.groupFromTarget(event);
  var customTime = CustomTime.customTimeFromTarget(event);

  var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var time = this._toTime(x);
  var snappedTime = snap ? snap(time, scale, step) : time;

  var element = util.getTarget(event);
  var what = null;
  if (item != null)                                                    {what = 'item';}
  else if (customTime != null)                                         {what = 'custom-time';}
  else if (util.hasParent(element, this.timeAxis.dom.foreground))      {what = 'axis';}
  else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {what = 'axis';}
  else if (util.hasParent(element, this.itemSet.dom.labelSet))         {what = 'group-label';}
  else if (util.hasParent(element, this.currentTime.bar))              {what = 'current-time';}
  else if (util.hasParent(element, this.dom.center))                   {what = 'background';}

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime
  }

var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var time = this._toTime(x);
  var snappedTime = snap ? snap(time, scale, step) : time;

  var element = util.getTarget(event);
  var what = null;
  if (item != null)                                                    {what = 'item';}
  else if (customTime != null)                                         {what = 'custom-time';}
  else if (util.hasParent(element, this.timeAxis.dom.foreground))      {what = 'axis';}
  else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {what = 'axis';}
  else if (util.hasParent(element, this.itemSet.dom.labelSet))         {what = 'group-label';}
  else if (util.hasParent(element, this.currentTime.bar))              {what = 'current-time';}
  else if (util.hasParent(element, this.dom.center))                   {what = 'background';}

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime
  }
};

var item  = this.itemSet.itemFromTarget(event);
  var group = this.itemSet.groupFromTarget(event);
  var customTime = CustomTime.customTimeFromTarget(event);

  var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var time = this._toTime(x);
  var snappedTime = snap ? snap(time, scale, step) : time;

  var element = util.getTarget(event);
  var what = null;
  if (item != null)                                                    {what = 'item';}
  else if (customTime != null)                                         {what = 'custom-time';}
  else if (util.hasParent(element, this.timeAxis.dom.foreground))      {what = 'axis';}
  else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {what = 'axis';}
  else if (util.hasParent(element, this.itemSet.dom.labelSet))         {what = 'group-label';}
  else if (util.hasParent(element, this.currentTime.bar))              {what = 'current-time';}
  else if (util.hasParent(element, this.dom.center))                   {what = 'background';}

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime

var group = this.itemSet.groupFromTarget(event);
  var customTime = CustomTime.customTimeFromTarget(event);

  var snap = this.itemSet.options.snap || null;
  var scale = this.body.util.getScale();
  var step = this.body.util.getStep();
  var time = this._toTime(x);
  var snappedTime = snap ? snap(time, scale, step) : time;

  var element = util.getTarget(event);
  var what = null;
  if (item != null)                                                    {what = 'item';}
  else if (customTime != null)                                         {what = 'custom-time';}
  else if (util.hasParent(element, this.timeAxis.dom.foreground))      {what = 'axis';}
  else if (this.timeAxis2 && util.hasParent(element, this.timeAxis2.dom.foreground)) {what = 'axis';}
  else if (util.hasParent(element, this.itemSet.dom.labelSet))         {what = 'group-label';}
  else if (util.hasParent(element, this.currentTime.bar))              {what = 'current-time';}
  else if (util.hasParent(element, this.dom.center))                   {what = 'background';}

  return {
    event: event,
    item: item ? item.id : null,
    group: group ? group.groupId : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    snappedTime: snappedTime
  }
};