?? treeusingfiledao.jsp
字號:
<%@ page import="com.jenkov.prizetags.tree.impl.TreeNode,
com.jenkov.prizetags.tree.impl.Tree,
com.jenkov.prizetags.tree.itf.*" %>
<%@ page import="com.jenkov.prizetags.tree.impl.TreeSorter"%>
<%@ page import="com.jenkov.prizetags.tree.impl.FileDao"%>
<%@ page import="java.io.File"%>
<%@ taglib uri="/WEB-INF/treetag.tld" prefix="tree" %>
<%@ taglib uri="/WEB-INF/requesttags.tld" prefix="request" %>
<%
if(session.getAttribute("example") == null){
//creating a simple tree model instance
ITree tree = new Tree();
tree.setSingleSelectionMode(true);
// tree.setTreeDao(new FileDao(new File("./webapps/prizetagsdemo")));
tree.setTreeDao(new FileDao(new File(".")));
//storing the tree model instance in the session.
//this is where the tags get the tree model from later.
session.setAttribute("example", tree);
// request.setAttribute("example", tree);
}
%>
<html>
<head>
<title>Tree Tag - Single Page - (C) 2004 Jenkov Development</title>
<link rel="stylesheet" href="/prizetagsdemo/stylesheet.css" type="text/css">
</head>
<body>
<h2>Tree Using ITreeDao</h2>
This JSP page demonstrates how to use the ITreeDao to dynamically (and lazily) load the nodes of
a tree. The demo uses a FileDao which reads the nodes from the file system.
<br/><br/>
You can implement your
own ITreeDao to read nodes from whereever you need to... database, XML DOM trees, JNDI etc.
The ITreeDao interface is simple. It only contains two methods.
<br/><br/>
<table cellspacing="0" cellpadding="5" style="border: 1 solid black;">
<tr><td valign="top">
<%-- Generating the Tree HTML --%>
<table cellspacing="0" cellpadding="0" border="0">
<tree:tree tree="example" node="example.node" includeRootNode="true">
<tr><td
><table cellspacing="0" cellpadding="0" border="0">
<tr><td><tree:nodeIndent node="example.node" indentationType="type"><tree:nodeIndentVerticalLine indentationType="type" ><img src="../images/verticalLine.gif"></tree:nodeIndentVerticalLine><tree:nodeIndentBlankSpace indentationType="type" ><img src="../images/blankSpace.gif"></tree:nodeIndentBlankSpace></tree:nodeIndent></td>
<tree:nodeMatch node="example.node" expanded="false" hasChildren="true" isLastChild="false"><td><a href="<request:requestUri/>?expand=<tree:nodeId node="example.node"/>"><img src="../images/collapsedMidNode.gif" border="0"></a><img src="../images/closedFolder.gif"></td></tree:nodeMatch>
<tree:nodeMatch node="example.node" expanded="true" hasChildren="true" isLastChild="false"><td><a href="<request:requestUri/>?collapse=<tree:nodeId node="example.node"/>"><img src="../images/expandedMidNode.gif" border="0"></a><img src="../images/openFolder.gif"></td></tree:nodeMatch>
<tree:nodeMatch node="example.node" expanded="false" hasChildren="true" isLastChild="true" ><td><a href="<request:requestUri/>?expand=<tree:nodeId node="example.node"/>"><img src="../images/collapsedLastNode.gif" border="0"></a><img src="../images/closedFolder.gif"></td></tree:nodeMatch>
<tree:nodeMatch node="example.node" expanded="true" hasChildren="true" isLastChild="true" ><td><a href="<request:requestUri/>?collapse=<tree:nodeId node="example.node"/>"><img src="../images/expandedLastNode.gif" border="0"></a><img src="../images/openFolder.gif"></td></tree:nodeMatch>
<tree:nodeMatch node="example.node" expanded="false" hasChildren="false" isLastChild="false"><td><img src="../images/noChildrenMidNode.gif"><img src="../images/nonFolder.gif"></td></tree:nodeMatch>
<tree:nodeMatch node="example.node" expanded="false" hasChildren="false" isLastChild="true" ><td><img src="../images/noChildrenLastNode.gif"><img src="../images/nonFolder.gif"></td></tree:nodeMatch>
<td valign="top">
<tree:nodeMatch node="example.node" selected="true"><span style="Font-Size: 12px;"><b><tree:nodeName node="example.node"/></b></span></tree:nodeMatch>
<tree:nodeMatch node="example.node" selected="false"><a href="<request:requestUri/>?select=<tree:nodeId node="example.node"/>"><span style="Font-Size: 12px;"><tree:nodeName node="example.node"/></span></a></tree:nodeMatch>
</td>
</tr>
</table></td></tr>
</tree:tree>
</table>
</td>
<td valign="top" style="border-left: 1 solid black;">
Selected Node Detail:<br/><br/>
<%
ITree tree = (ITree) session.getAttribute("example");
ITreeNode node = new TreeNode(); //empty node, displayed when the tree isn't initialized yet.
if(tree != null && request.getParameter("select") != null){
node = tree.findNode(request.getParameter("select"));
}
%>
<table cellspacing="0" cellpadding="5">
<tr><td>Id </td><td><%=node.getId()%></td></tr>
<tr><td>Name</td><td><%=node.getName()%></td></tr>
<tr><td>Type</td><td><%=node.getType()%></td></tr>
</table>
</td>
</tr>
</table>
</body>
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