How to capture the Go button for the Query region and edit the where cause

Hi,

On query region we can capture the Go button click and execute our own search along with Standard Search.

     OAApplicationModule ap = (OAApplicationModule)pageContext.getApplicationModule(webBean);
    OAQueryBean bean = (OAQueryBean)webBean.findIndexedChildRecursive("queryRN");
    if(bean!=null)
    {
      String id = (String)bean.getGoButtonName();
      if(pageContext.getParameter(id)!=null)
      {
          ap.invokeMethod("initsearch",params);
       }

public void initsearch(String fromnum,String tonum,String fromdate,String todate)
 { 
    String whereClause = null;
    int whereClausecount = 0;
    OAViewObject vo = (OAViewObject)getReprintInvoiceVO1();
    vo.setWhereClause(null);
    vo.setWhereClauseParams(null);
   if(fromnum!=null&&!("".equals(fromnum.trim())))
    {
      whereClause = "INVOICE_NUMBER >= :1" ;
      vo.setWhereClauseParam(whereClausecount,fromnum);
      whereClausecount++;
    }
    if(tonum!=null&&!("".equals(tonum.trim())))
    {
      
      if(whereClause!=null)
      {
       
        whereClause = whereClause +" AND INVOICE_NUMBER <= :2";
        vo.setWhereClauseParam(whereClausecount,tonum);
        whereClausecount++;
      }
      else
      {
       
        whereClause = "INVOICE_NUMBER <= :1";
        vo.setWhereClauseParam(whereClausecount,tonum);
        whereClausecount++;
      }   
    }
    if(fromdate!=null&&!("".equals(fromdate.trim())))
    {
     if(whereClause!=null)
     {
       if((fromnum!=null&&!("".equals(fromnum.trim())))&&(tonum!=null&&!("".equals(tonum.trim()))))
       {
         whereClause = whereClause +" AND INVOICE_DATE > = :3";
         vo.setWhereClauseParam(whereClausecount,fromdate);
         whereClausecount++; 
       }
       else
       {
         whereClause = whereClause +" AND INVOICE_DATE > = :2";
         vo.setWhereClauseParam(whereClausecount,fromdate);
         whereClausecount++;
       }
      
     }
     else
     {
        whereClause = " INVOICE_DATE >= :1";
        vo.setWhereClauseParam(whereClausecount,fromdate);
        whereClausecount++;
     }
    }
    if(todate!=null&&!("".equals(todate.trim())))
    {
     if(whereClause!=null)
     {
       if((fromnum!=null&&!("".equals(fromnum.trim())))&&(tonum!=null&&!("".equals(tonum.trim())))&&(fromdate!=null&&!("".equals(fromdate.trim()))))
       {
         whereClause = whereClause +" AND INVOICE_DATE < = :4";
         vo.setWhereClauseParam(whereClausecount,todate);
         whereClausecount++;
       }
       else
       {
         whereClause = whereClause +" AND INVOICE_DATE < = :3";
         vo.setWhereClauseParam(whereClausecount,todate);
         whereClausecount++;
       }
     }
     else
     {
        whereClause = " INVOICE_DATE <= :1";
        vo.setWhereClauseParam(whereClausecount,todate);
        whereClausecount++;
     }
    }
   
    vo.setWhereClause(whereClause);
}