效果如图：
Create Tree
<ul id="tt"></ul>
$('#tt').etree({
url: 'tree_data.json',
createUrl: ...,
updateUrl: ...,
destroyUrl: ...,
dndUrl: ...
});
设置url,createUrl,updateUrl,destroyUrl,dndUrl属性来自动同步数据到服务器
url: 返回树的数据
createUrl: 当创建一个新的节点,tree将传入名为parentId即表示父节点ID的参数
updateUrl: 当更新一个节点,将传入id和text参数到服务器
destroyUrl: 当销毁一个节点,传入id参数
dndUrl: 当拖放节点,将传入以下参数到服务器。ID：被拖动的ID,targetId:被拖至到的ID
Demo：
<body>
<a href="#" onclick="javascript:$('#tt').etree('create')">Create</a>
<a href="#" onclick="javascript:$('#tt').etree('edit')">Edit</a>
<a href="#" onclick="javascript:$('#tt').etree('destroy')">Destroy</a>
<ul id=tt></ul>
</body>
<script type="text/javascript">
$('#tt').etree({
url: 'treeLoad.action',
createUrl: 'treeCreate.action',
updateUrl: 'treeUpdate.action',
destroyUrl: 'treeDestroy.action',
dndUrl: 'treeDnd.action'
});
</script>
struts.xml
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="tree_json" extends="json-default"> <action name="treeLoad" method="treeLoad" class="com.home.web.TreeAction"> <result type="json"> <param name="root">treeNodes</param> </result> </action> <action name="treeCreate" method="treeCreate" class="com.home.web.TreeAction"> <result type="json"> <param name="root">treeNodes</param> </result> </action> <action name="treeUpdate" method="treeUpdate" class="com.home.web.TreeAction"> <result type="json"> <param name="root">treeNodes</param> </result> </action> <action name="treeDestroy" method="treeDestroy" class="com.home.web.TreeAction"> <result type="json"> <param name="root">treeNodes</param> </result> </action> <action name="treeDnd" method="treeDnd" class="com.home.web.TreeAction"> <result type="json"> <param name="root">treeNodes</param> </result> </action> </package> </struts>
需要封装对象Tree
public class TreeNode {
private static final long serialVersionUID = 1L;
private String id; // 节点id
private String text; // 显示的节点文本
private String state = "open"; // 节点状态,'open'或者 'closed',默认是 'open'
private boolean checked; // 指明检查节点是否选中.
public TreeNode() {
}
public TreeNode(String id, String text, String state, boolean checked) {
this.id = id;
this.text = text;
this.state = state;
this.checked = checked;
}
//省略setXXX(),getXXX()
}
Action方法实现
/**
* 查询数据使用JDBC进行操作
*
*/
public class TreeAction {
private List<TreeNode> treeNodes = new ArrayList<TreeNode>(); // 返回的JSON数据
private String id; // 树组件使用的ID
private String parentId; // 树父ID
private String text; // 显示文本
private String targetId; // 拖拽目标ID
/**
* 树展现
*
* @return
*/
public String treeLoad() {
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
String sql = "";
if (id == null) { // 如果id为null或0则是根节点
sql = "select * from easyui_tree where parentid = '' or parentid = '0'";
} else { // 查询下面的子节点
sql = "select * from easyui_tree where parentid = " + id;
}
rs = sta.executeQuery(sql);
while (rs.next()) {
String id = rs.getString("id");
String name = rs.getString("name");
TreeNode node = new TreeNode();
node.setId(id);
node.setText(name);
node.setChecked(false);
// 判断是否有子节点，如果有则closed 否则open
if (isChildrenNode(id)) {
node.setState("closed");
} else {
node.setState("open");
}
treeNodes.add(node);
}
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return "success";
}
/**
* 创建tree
*
* @return
*/
public String treeCreate() {
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
//ID为自增,无需插入
String sql = "insert into easyui_tree(NAME,parentid) values('','" + parentId + "')";
sta.execute(sql);
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return "success";
}
/**
* 修改tree
*
* @return
*/
public String treeUpdate() {
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
String sql = "update easyui_tree set name = '" + text + "' where id = '" + id + "'";
sta.executeUpdate(sql);
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return "success";
}
/**
* 删除tree
*
* @return
*/
public String treeDestroy() {
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
String sql = "delete from easyui_tree where id = '" + id + "'";
sta.executeUpdate(sql);
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return "success";
}
/**
* 拖拽
*
* @return
*/
public String treeDnd() {
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
//将parentid改为拖拽至目标ID
String sql = "update easyui_tree set parentid = '" + targetId + "' where id = '" + id + "'";
sta.executeUpdate(sql);
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return "success";
}
/**
* 判断是否有子节点
*
* @return
*/
public boolean isChildrenNode(String id) {
Boolean flag = false;
Statement sta = null;
ResultSet rs = null;
try {
Connection conn = ConnectionManager.getConnection();
sta = conn.createStatement();
String sql = "select * from easyui_tree where parentid = " + id;
rs = sta.executeQuery(sql);
while (rs.next()) {
flag = true;
}
// 关闭所有资源
ConnectionManager.closeAll(rs, sta, conn);
} catch (SQLException e) {
e.printStackTrace();
}
return flag;
}
//省略setXXX(),getXXX()方法
}
获取Connection的ConnectionManager封装类参见blog.ytso.com/article/details/38818449
数据库脚本
create database easyui;
use easyui;
CREATE TABLE easyui_tree(
id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
NAME VARCHAR(10),
parentid VARCHAR(10)
);
insert into easyui_tree values('1','北京','0');
insert into easyui_tree values('2','上海','0');
insert into easyui_tree values('3','深圳','0');
insert into easyui_tree values('4','广州','0');
insert into easyui_tree values('5','海淀','1');
insert into easyui_tree values('6','朝阳','1');
insert into easyui_tree values('7','昌平','1');
insert into easyui_tree values('8','西二旗','5');
insert into easyui_tree values('9','上地','5');
项目源码下载：http://download.csdn.net/detail/blog.ytso.com/7856545
出处：blog.ytso.com/article/details/38846521
原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/14515.html