code: public void setOnFocus(String onfocus)
      {
          _anchorState.registerAttribute(AbstractHtmlState.ATTR_JAVASCRIPT, HtmlConstants.ONFOCUS, onfocus);
      }
docs: Sets the onFocus JavaScript event for the HTML anchor.
  @param onfocus the onFocus event.
  @jsptagref.attributedescription The onFocus JavaScript event for the HTML anchor.
  @jsptagref.attributesyntaxvalue <i>string_onFocus</i>
  @netui:attribute required="false" rtexprvalue="true"
  description="The onFocus JavaScript event."