如何实现JSP动态树

编辑作者:www.789mux.com    在线用户:65    标签: jsp   

我们在实际项目开发中是会经常用到动态树的,其实动态树就是可以支持无限级子节点的功能。但是你知道如何实现动态树吗?今天我就去给大家实际演示一下动态树的实现方法。

第一步:在开始之前我们需要准备这么一个js文件,代码如下。我姑且将它命名为tree.js。

复制代码 代码如下:

function Node(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr) {
    this.id = id;
    this.pid = pid;
    this.name = name;
    this.url = url;
    this.title = title;
    this.target = target;

    this.icon = icon;
    this.iconOpen = iconOpen;

    this.appendedStr = appendedStr;

    this._io = open || false;
    this._is = false;
    this._ls = false;
    this._hc = false;
    this._ai = 0;
    this._p;
};
// Tree object
function tree(objName,path) {
    this.path = path;
    this.config = {
        target                    : null,
        folderLinks            : true,
        useSelection        : true,
        useCookies            : true,
        useLines                : true,
        useIcons                : true,
        useStatusText        : false,
        closeSameLevel    : false,
        inOrder                    : false
    }
    this.icon = {
        root                : path + 'TreeDemo/images/tree_base.gif',
        folder            : path + 'TreeDemo/images/tree_folder.gif',
        folderOpen    : path + 'TreeDemo/images/tree_folderopen.gif',
        node                : path + 'TreeDemo/images/tree_folder.gif',
        empty                : path + 'TreeDemo/images/tree_empty.gif',
        line                : path + 'TreeDemo/images/tree_line.gif',
        join                : path + 'TreeDemo/images/tree_join.gif',
        joinBottom    : path + 'TreeDemo/images/tree_joinbottom.gif',
        plus                : path + 'TreeDemo/images/tree_plus.gif',
        plusBottom    : path + 'TreeDemo/images/tree_plusbottom.gif',
        minus                : path + 'TreeDemo/images/tree_minus.gif',
        minusBottom    : path + 'TreeDemo/images/tree_minusbottom.gif',
        nlPlus            : path + 'TreeDemo/images/tree_nolines_plus.gif',
        nlMinus            : path + 'TreeDemo/images/tree_nolines_minus.gif'
    };
    this.obj = objName;
    this.aNodes = [];
    this.aIndent = [];
    this.root = new Node(-1);
    this.selectedNode = null;
    this.selectedFound = false;
    this.completed = false;
};
// Adds a new node to the node array
tree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr) {
    this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open, appendedStr);
};
// Open/close all nodes
tree.prototype.openAll = function() {
    this.oAll(true);
};
tree.prototype.closeAll = function() {
    this.oAll(false);
};
// Outputs the tree to the page
tree.prototype.toString = function() {
    var str = '<div class="tree">\n';
    if (document.getElementById) {
        if (this.config.useCookies) this.selectedNode = this.getSelected();
        str += this.addNode(this.root);
    } else str += 'Browser not supported.';
    str += '</div>';
    if (!this.selectedFound) this.selectedNode = null;
    this.completed = true;
    return str;
};
// Creates the tree structure
tree.prototype.addNode = function(pNode) {
    var str = '';
    var n=0;
    if (this.config.inOrder) n = pNode._ai;
    for (n; n<this.aNodes.length; n++) {
        if (this.aNodes[n].pid == pNode.id) {
            var cn = this.aNodes[n];
            cn._p = pNode;
            cn._ai = n;
            this.setCS(cn);
            if (!cn.target && this.config.target) cn.target = this.config.target;
            if (cn._hc && !cn._io && this.config.useCookies) cn._io = this.isOpen(cn.id);
            if (!this.config.folderLinks && cn._hc) cn.url = null;
            if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound) {
                    cn._is = true;
                    this.selectedNode = n;
                    this.selectedFound = true;
            }
            str += this.node(cn, n);
            if (cn._ls) break;
        }
    }
    return str;
};
// Creates the node icon, url and text
tree.prototype.node = function(node, nodeId) {
    var str = '<div class="treeNode">' + this.indent(node, nodeId);
    if (this.config.useIcons) {
        if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);
        if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;
        if (this.root.id == node.pid) {
            node.icon = this.icon.root;
            node.iconOpen = this.icon.root;
        }
        str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" />';
    }
    if (node.url) {
        str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '" href="' + node.url + '"';
        if (node.title) str += ' ';
        if (node.target) str += ' target="' + node.target + '"';
        if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';
        if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))
            str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';
        str += '>';
    }
    else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)
        str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node">';
    str += node.name;
    if (node.url || ((!this.config.folderLinks || !node.url) && node._hc)) str += '</a>';

    //[!--begin--]add by wangxr to append str
    if(node.appendedStr) str += node.appendedStr;
    //[!--end--]
    str += '</div>';
    if (node._hc) {
        str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';
        str += this.addNode(node);
        str += '</div>';
    }
    this.aIndent.pop();
    return str;
};
// Adds the empty and line icons
tree.prototype.indent = function(node, nodeId) {
    var str = '';
    if (this.root.id != node.pid) {
        for (var n=0; n<this.aIndent.length; n++)
            str += '<img src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" />';
        (node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);
        if (node._hc) {
            str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';
            if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;
            else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );
            str += '" src="'; if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus; else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) ); str += '" /></a>';
        } else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" />';
    }
    return str;
};
// Checks if a node has any children and if it is the last sibling
tree.prototype.setCS = function(node) {
    var lastId;
    for (var n=0; n<this.aNodes.length; n++) {
        if (this.aNodes[n].pid == node.id) node._hc = true;
        if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;
    }
    if (lastId==node.id) node._ls = true;
};
// Returns the selected node
tree.prototype.getSelected = function() {
    var sn = this.getCookie('cs' + this.obj);
    return (sn) ? sn : null;
};
// Highlights the selected node
tree.prototype.s = function(id) {
    if (!this.config.useSelection) return;
    var cn = this.aNodes[id];
    if (cn._hc && !this.config.folderLinks) return;
    if (this.selectedNode != id) {
        if (this.selectedNode || this.selectedNode==0) {
            eOld = document.getElementById("s" + this.obj + this.selectedNode);
            eOld.className = "node";
        }
        eNew = document.getElementById("s" + this.obj + id);
        eNew.className = "nodeSel";
        this.selectedNode = id;
        if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);
    }
};
// Toggle Open or close
tree.prototype.o = function(id) {
    var cn = this.aNodes[id];
    this.nodeStatus(!cn._io, id, cn._ls);
    cn._io = !cn._io;
    if (this.config.closeSameLevel) this.closeLevel(cn);
    if (this.config.useCookies) this.updateCookie();
};
// Open or close all nodes
tree.prototype.oAll = function(status) {
    for (var n=0; n<this.aNodes.length; n++) {
        if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {
            this.nodeStatus(status, n, this.aNodes[n]._ls)
            this.aNodes[n]._io = status;
        }
    }
    if (this.config.useCookies) this.updateCookie();
};
// Opens the tree to a specific node
tree.prototype.openTo = function(nId, bSelect, bFirst) {
    if (!bFirst) {
        for (var n=0; n<this.aNodes.length; n++) {
            if (this.aNodes[n].id == nId) {
                nId=n;
                break;
            }
        }
    }
    var cn=this.aNodes[nId];
    if (cn.pid==this.root.id || !cn._p) return;
    cn._io = true;
    cn._is = bSelect;
    if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);
    if (this.completed && bSelect) this.s(cn._ai);
    else if (bSelect) this._sn=cn._ai;
    this.openTo(cn._p._ai, false, true);
};
// Closes all nodes on the same level as certain node
tree.prototype.closeLevel = function(node) {
    for (var n=0; n<this.aNodes.length; n++) {
        if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {
            this.nodeStatus(false, n, this.aNodes[n]._ls);
            this.aNodes[n]._io = false;
            this.closeAllChildren(this.aNodes[n]);
        }
    }
}
// Closes all children of a node
tree.prototype.closeAllChildren = function(node) {
    for (var n=0; n<this.aNodes.length; n++) {
        if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {
            if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);
            this.aNodes[n]._io = false;
            this.closeAllChildren(this.aNodes[n]);        
        }
    }
}
// Change the status of a node(open or closed)
tree.prototype.nodeStatus = function(status, id, bottom) {
    eDiv    = document.getElementById('d' + this.obj + id);
    eJoin    = document.getElementById('j' + this.obj + id);
    if (this.config.useIcons) {
        eIcon    = document.getElementById('i' + this.obj + id);
        eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;
    }
    eJoin.src = (this.config.useLines)?
    ((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):
    ((status)?this.icon.nlMinus:this.icon.nlPlus);
    eDiv.style.display = (status) ? 'block': 'none';
};
// [Cookie] Clears a cookie
tree.prototype.clearCookie = function() {
    var now = new Date();
    var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);
    this.setCookie('co'+this.obj, 'cookieValue', yesterday);
    this.setCookie('cs'+this.obj, 'cookieValue', yesterday);
};
// [Cookie] Sets value in a cookie
tree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {
    document.cookie =
        escape(cookieName) + '=' + escape(cookieValue)
        + (expires ? '; expires=' + expires.toGMTString() : '')
        + (path ? '; path=' + path : '')
        + (domain ? '; domain=' + domain : '')
        + (secure ? '; secure' : '');
};
// [Cookie] Gets a value from a cookie
tree.prototype.getCookie = function(cookieName) {
    var cookieValue = '';
    var posName = document.cookie.indexOf(escape(cookieName) + '=');
    if (posName != -1) {
        var posValue = posName + (escape(cookieName) + '=').length;
        var endPos = document.cookie.indexOf(';', posValue);
        if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));
        else cookieValue = unescape(document.cookie.substring(posValue));
    }
    return (cookieValue);
};
// [Cookie] Returns ids of open nodes as a string
tree.prototype.updateCookie = function() {
    var str = '';
    for (var n=0; n<this.aNodes.length; n++) {
        if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {
            if (str) str += '.';
            str += this.aNodes[n].id;
        }
    }
    this.setCookie('co' + this.obj, str);
};
// [Cookie] Checks if a node id is in a cookie
tree.prototype.isOpen = function(id) {
    var aOpen = this.getCookie('co' + this.obj).split('.');
    for (var n=0; n<aOpen.length; n++)
        if (aOpen[n] == id) return true;
    return false;
};
// If Push and pop is not implemented by the browser
if (!Array.prototype.push) {
    Array.prototype.push = function array_push() {
        for(var i=0;i<arguments.length;i++)
            this[this.length]=arguments[i];
        return this.length;
    }
};
if (!Array.prototype.pop) {
    Array.prototype.pop = function array_pop() {
        lastElement = this[this.length-1];
        this.length = Math.max(this.length-1,0);
        return lastElement;
    }
};


由于代码太长,我这里就不给大家拿来细讲了,我们只要会用就OK。就像猪肉我们能吃就OK,不一定非要知道猪养。
第二步:创建数据库,创建数据库的代码如下,我这边使用的是MySQL数据为。
create database `treedemo`;
use treedemo;
create table trees(
tid int primary key not null,
pid int not null,
tname varchar(50) not null,
isleaf int
);
select * from trees;
insert into trees(tid,pid,tname)values(0,-1,'组织内容');
insert into trees(tid,pid,tname)values(1,0,'短信');
insert into trees(tid,pid,tname)values(2,0,'彩信');
insert into trees(tid,pid,tname)values(3,0,'新闻');
insert into trees(tid,pid,tname)values(4,1,'移动生活');
insert into trees(tid,pid,tname)values(5,1,'单条滚动点播');
insert into trees(tid,pid,tname)values(6,2,'定制');
insert into trees(tid,pid,tname)values(7,2,'点播');
insert into trees(tid,pid,tname)values(8,3,'房产频道');
insert into trees(tid,pid,tname)values(9,3,'农村频道');
insert into trees(tid,pid,tname)values(10,3,'数码频道');
insert into trees(tid,pid,tname)values(11,6,'幽默笑话');
insert into trees(tid,pid,tname)values(12,7,'铃声');
insert into trees(tid,pid,tname)values(13,7,'贺卡');
insert into trees(tid,pid,tname)values(14,7,'动画');
insert into trees(tid,pid,tname)values(15,13,'贺卡1');
insert into trees(tid,pid,tname)values(16,13,'贺卡2');
insert into trees(tid,pid,tname)values(17,13,'贺卡3');
insert into trees(tid,pid,tname)values(18,13,'贺卡4');
select * from trees;
表字段的说明:
(1)tid表示节点的编号;
(2)pid 该节点父节点的编号;
(3)tname 节点名称;
(4)isleaf 表明该节点是否为叶节点,叶节点为1,非叶节点为0。该字段可根据实际情况增删。

第三步:在myeclipse中创建一个WEB工程,命名为“TreeDemo”。在WebRoot文件夹下创建js文件夹、css文件夹、images文件夹分别用来存放.js文件、.css文件和项目中用到的图片文件。
第四步:编写数据库连接类,其中的用户名、密码需要根据你数据库情况进行修改,代码如下。

 

代码如下:

 


package com.sx.mas.utils;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConn {
private static final String DRIVER="com.mysql.jdbc.Driver";
private static final String URL="jdbc:mysql://localhost:3306/treedemo";
Connection conn=null;
public Connection getConnection(){
try {
Class.forName(DRIVER);
conn=DriverManager.getConnection(URL,"root","root");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
}
package com.sx.mas.utils;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBConn {
    private static final String DRIVER="com.mysql.jdbc.Driver";
    private static final String URL="jdbc:mysql://localhost:3306/treedemo";
    Connection conn=null;
    public Connection getConnection(){
        try {
            Class.forName(DRIVER);
            conn=DriverManager.getConnection(URL,"root","root");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }
}


第五步:编写javabean类,代码如下,

 

代码如下:

 


package com.sx.mas.beans;
public class TreeNode {
private int tid;
private int pid;
private String tname;
private int isleaf;
public int getTid() {
return tid;
}
public void setTid(int tid) {
this.tid = tid;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getTname() {
return tname;
}
public void setTname(String tname) {
this.tname = tname;
}
public int getIsleaf() {
return isleaf;
}
public void setIsleaf(int isleaf) {
this.isleaf = isleaf;
}
}
package com.sx.mas.beans;
public class TreeNode {
    private int tid;
    private int pid;
    private String tname;
    private int isleaf;

    public int getTid() {
        return tid;
    }
    public void setTid(int tid) {
        this.tid = tid;
    }
    public int getPid() {
        return pid;
    }
    public void setPid(int pid) {
        this.pid = pid;
    }
    public String getTname() {
        return tname;
    }
    public void setTname(String tname) {
        this.tname = tname;
    }
    public int getIsleaf() {
        return isleaf;
    }
    public void setIsleaf(int isleaf) {
        this.isleaf = isleaf;
    }
}


第六步:创建相关的DAO类,代码如下。DAO类将数据库表装保存到Vector对象中。

 

代码如下:

 


package com.sx.mas.beans;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import com.sx.mas.utils.DBConn;
public class TreeDAO {
public Vector getTree(){
Vector vec = new Vector();
DBConn dbconn = new DBConn();
Connection conn = dbconn.getConnection();
try {
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from trees");
while(rs.next()){
TreeNode treenode = new TreeNode();
treenode.setTid(rs.getInt("tid"));
treenode.setPid(rs.getInt("pid"));
treenode.setTname(rs.getString("tname"));
treenode.setIsleaf(rs.getInt("isleaf"));
vec.add(treenode);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return vec;
}
}
package com.sx.mas.beans;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import com.sx.mas.utils.DBConn;
public class TreeDAO {
    public Vector getTree(){
        Vector vec = new Vector();
        DBConn dbconn = new DBConn();
        Connection conn = dbconn.getConnection();
        try {
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("select * from trees");
            while(rs.next()){
                TreeNode treenode = new TreeNode();
                treenode.setTid(rs.getInt("tid"));
                treenode.setPid(rs.getInt("pid"));
                treenode.setTname(rs.getString("tname"));
             treenode.setIsleaf(rs.getInt("isleaf"));
                vec.add(treenode);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return vec;
    }
}


第七步:页面上显示树状结构。在TreeDemo中创建show_tree.jsp页面,代码如下。

 

代码如下:

 


<%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%>
<%@ page import="com.sx.mas.beans.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<LINK href="css/tree.css" href="css/tree.css" type=text/css rel=stylesheet>
<LINK href="css/css.css" href="css/css.css" rel=stylesheet>
<SCRIPT src="js/tree.js" src="js/tree.js" type=text/javascript></SCRIPT>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" href="styles.css">
-->
</head>
<body onresize="return true;" leftMargin=1 topMargin=1>
<table>
<tr>
<td valign="top">
<TABLE class=table_left_menu cellSpacing=0 cellPadding=0 width="100%"
background=images/tree_bg.gif border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><IMG height=24 src="images/tree_button.gif" src="images/tree_button.gif"
width=147 useMap=#Map border=0>
<MAP id=Map name=Map>
<AREA shape="RECT" shape="RECT" coords="16,3,69,15" coords="16,3,69,15" href="javascript:%20d.openAll()" href="javascript:%20d.openAll()">
<AREA shape="RECT" shape="RECT" coords="72,3,131,15" coords="72,3,131,15" href="javascript:%20d.closeAll()" href="javascript:%20d.closeAll()">
</MAP>
</DIV>
</TD>
</TR>
</TBODY>
</TABLE>
<SCRIPT type=text/javascript>
d = new tree('d','../');
<%
TreeDAO treedao = new TreeDAO();
Vector vec =treedao.getTree();
Iterator iterator = vec.iterator();
while(iterator.hasNext()){
TreeNode treenode = (TreeNode)iterator.next();
if(treenode.getIsleaf()==0){
%>
d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>')
<%}else{%>
d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>',parent.getUrlByCatalogId('<%=treenode.getTid()%>'),null,'list');
<%}}%>
document.write(d);
</SCRIPT>
</td>
</tr>
</table>
</body>
</html>
<%@ page language="java" import="java.util.*" contentType="text/html; charset=gb2312"%>
<%@ page import="com.sx.mas.beans.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<LINK href="css/tree.css" href="css/tree.css" type=text/css rel=stylesheet>
<LINK href="css/css.css" href="css/css.css" rel=stylesheet>
<SCRIPT src="js/tree.js" src="js/tree.js" type=text/javascript></SCRIPT>
<title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css" href="styles.css">
    -->
</head>
<body onresize="return true;" leftMargin=1 topMargin=1>
    <table>
        <tr>
            <td valign="top">
<TABLE class=table_left_menu cellSpacing=0 cellPadding=0 width="100%"
background=images/tree_bg.gif border=0>
<TBODY>
<TR>
<TD>
<DIV align=center><IMG height=24 src="images/tree_button.gif" src="images/tree_button.gif"
width=147 useMap=#Map border=0>
<MAP id=Map name=Map>
<AREA shape="RECT" shape="RECT" coords="16,3,69,15" coords="16,3,69,15" href="javascript:%20d.openAll()" href="javascript:%20d.openAll()">
<AREA shape="RECT" shape="RECT" coords="72,3,131,15" coords="72,3,131,15" href="javascript:%20d.closeAll()" href="javascript:%20d.closeAll()">
</MAP>
</DIV>
</TD>
</TR>
</TBODY>
</TABLE>
<SCRIPT type=text/javascript>
        d = new tree('d','../');
        <%
            TreeDAO treedao = new TreeDAO();
            Vector vec =treedao.getTree();
            Iterator iterator = vec.iterator();
            while(iterator.hasNext()){
            TreeNode treenode = (TreeNode)iterator.next();
            if(treenode.getIsleaf()==0){
        %>
         d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>')
         <%}else{%>
         d.add(<%=treenode.getTid()%>,<%=treenode.getPid()%>,'<%=treenode.getTname()%>',parent.getUrlByCatalogId('<%=treenode.getTid()%>'),null,'list');
         <%}}%>
document.write(d);
</SCRIPT>
            </td>
        </tr>
    </table>
</body>
</html>


第八步:创建一个框架页面,index.html代码如下,和list_default.htm。

 

 

 


 

以上就是我们关于如何实现JSP动态树的内容,看完后我们知道只需要在jsp页面中包含js代码就可以了。那么动态树就需要javabean的支持了。 

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