menumaker.jsp

《JSP应用开发详解》第十九章 树状菜单生成 代码

<%!

Driver driver;
Connection connection;
PreparedStatement statement;
ResultSet resultset;
int SubHeight=20; 
void MenuList(String parentId,String name,int position,StringBuffer outHTML,boolean init){
	Vector childList=new Vector();
	Vector nameList=new Vector();
	try{
    	statement.setString(1,parentId);
    	resultset=statement.executeQuery();
    	while(resultset.next()){
      		childList.addElement(resultset.getString("ClassId"));			
      		nameList.addElement(resultset.getString("Name"));
    	}
	}catch(Exception e){;}
	int msize=childList.size();
	if(msize>0){
		if(!init){//不为根节点
			outHTML.append("<td class=\"OutMenu\" onClick=\"SubThis('"+parentId+"')\" onMouseOver=\"OverItem(this,'"+name+"');turnLayer('"+parentId+"','show')\" onMouseOut=\"OutItem(this);turnLayer('"+parentId+"','hide')\"><img src=\"../pic/more.gif\" align='right'>"+name+"\n");
	  		outHTML.append("<div id=\""+parentId+"\" style=\"width:220px; position:absolute; left:118px; top:"+position*SubHeight+"px; visibility: hidden;\" onMouseOut=\"turnLayer('"+parentId+"','hide')\" >\n");	
		}
		outHTML.append("<table border=\"1\" cellpadding=\"0\" cellspacing=\"0\" class=\"FixMenu\">\n");
		for(int i=0;i<msize;i++){
			outHTML.append("<tr>\n");
			MenuList((String)childList.elementAt(i),(String)nameList.elementAt(i),i,outHTML,false);
			outHTML.append("</tr>\n");
			if(i<msize-1) outHTML.append("<tr><td height=\"2\" bgcolor=\"#000000\"></td></tr>");
	    }
		outHTML.append("</table>\n");
		if(!init){//不为根节点
			outHTML.append("</div>\n");
			outHTML.append("</td>\n");
		}			
	}else{
		outHTML.append("<td  class=\"OutMenu\" onClick=\"SubThis('"+parentId+"')\" onMouseOver=\"OverItem(this,'"+name+"')\" onMouseOut=\"OutItem(this)\">"+name+"</td>\n");
	}
    return;
}
%>
<%
Driver driver = (Driver)Class.forName(DB_DRIVER).newInstance();
Connection connection = DriverManager.getConnection(DB_STRING,DB_USERNAME,DB_PASSWORD);
statement = connection.prepareStatement("SELECT ClassId,Name FROM TreeMenu WHERE ParentId= ? ORDER BY ChildIndex");
%>