How to use

getOffsetParent

method

in

com.google.gwt.user.client.Element

if (child.getElement().getOffsetParent() == null) {
 return;
if (child.getElement().getOffsetParent() == getElement()) {
 return;

private void checkGWTIssue1813(Widget child, AbsolutePanel parent) {
 if (!GWT.isScript()) {
  if (child.getElement().getOffsetParent() != parent.getElement()
    && !"HTML".equals(child.getElement().getOffsetParent().getNodeName())) {
   DOMUtil.reportFatalAndThrowRuntimeException("The boundary panel for this drag controller does not appear to have"
     + " 'position: relative' CSS applied to it."
     + " This may be due to custom CSS in your application, although this"
     + " is often caused by using the result of RootPanel.get(\"some-unique-id\") as your boundary"
     + " panel, as described in GWT issue 1813"
     + " (http://code.google.com/p/google-web-toolkit/issues/detail?id=1813)."
     + " You can often remedy this problem by adding one line of code to your application:"
     + " boundaryPanel.getElement().getStyle().setProperty(\"position\", \"relative\");");
  }
 }
}

 @Override
 public boolean execute() {
  if (!followOutput) {
   followScheduled = false;
   return false;
  }
  if (scrollPanel.getElement().getOffsetParent() != null) {
   scrollPanel.scrollToBottom();
   scrollPanel.scrollToLeft();
   followScheduled = false;
   return false;
  }
  return true;
 }
},

if (child.getElement().getOffsetParent() == null) {
 return;
if (child.getElement().getOffsetParent() == getElement()) {
 return;

 @Override
 public boolean execute() {
  if (scrollPanel.getElement().getOffsetParent() != null) {
   scrollPanel
     .getElement()
     .setScrollTop(scrollPanel.getElement().getScrollHeight());
   scrollBottomRequired = false;
   return false;
  }
  return true;
 }
},

if (child.getElement().getOffsetParent() == null) {
 return;
if (child.getElement().getOffsetParent() == getElement()) {
 return;

if (scrollPanel.getElement().getOffsetParent() != null) {
 scrollPanel.scrollToBottom();
 scrollPanel.scrollToLeft();

/** {@inheritDoc} */
@Override
public void scrollBottom() {
 /** scroll bottom immediately if view is visible */
 if (scrollPanel.getElement().getOffsetParent() != null) {
  scrollPanel.getElement().setScrollTop(scrollPanel.getElement().getScrollHeight());
  return;
 }
 /** otherwise, check the visibility periodically and scroll the view when it's visible */
 if (!scrollBottomRequired) {
  scrollBottomRequired = true;
  Scheduler.get()
    .scheduleFixedPeriod(
      new Scheduler.RepeatingCommand() {
       @Override
       public boolean execute() {
        if (scrollPanel.getElement().getOffsetParent() != null) {
         scrollPanel
           .getElement()
           .setScrollTop(scrollPanel.getElement().getScrollHeight());
         scrollBottomRequired = false;
         return false;
        }
        return true;
       }
      },
      1000);
 }
}

setBottom(getTop() + widget.getOffsetHeight());
Element elem = widget.getElement().getOffsetParent();
Element p;