• Layui之动态树

    目录

    一，分析左侧树形菜单

    二，获取表中的数据

    三，将表中的数据构建父子关系

    四，前端代码

    一，分析左侧树形菜单

    我们需要将如下数据展示在动态树当中

    表名：t_oa_permission

     从layui中得到的动态树模型代码

    main.jsp页面代码展示：

    1. <%@ page language="java" contentType="text/html; charset=UTF-8"
    2.     pageEncoding="UTF-8"%>
    3.     <%@ include file="common/head.jsp" %>
    4. html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    5. <html>
    6. <head>
    7. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    8. <title>Insert title heretitle>
    9. head>
    10. <body>
    11. <div class="layui-layout layui-layout-admin">
    12.   <div class="layui-header">
    13.     <div class="layui-logo layui-hide-xs layui-bg-black">layout demodiv>
    14.     
    15.     <ul class="layui-nav layui-layout-left">
    16.       
    17.       <li class="layui-nav-item layui-show-xs-inline-block layui-hide-sm" lay-header-event="menuLeft">
    18.         <i class="layui-icon layui-icon-spread-left">i>
    19.       li>
    20.       
    21.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 1a>li>
    22.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 2a>li>
    23.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 3a>li>
    24.       <li class="layui-nav-item">
    25.         <a href="javascript:;">nav groupsa>
    26.         <dl class="layui-nav-child">
    27.           <dd><a href="">menu 11a>dd>
    28.           <dd><a href="">menu 22a>dd>
    29.           <dd><a href="">menu 33a>dd>
    30.         dl>
    31.       li>
    32.     ul>
    33.     
    34.     <ul class="layui-nav layui-layout-right">
    35.       <li class="layui-nav-item layui-hide layui-show-md-inline-block">
    36.         <a href="javascript:;">
    37.           <img src="//tva1.sinaimg.cn/crop.0.0.118.118.180/5db11ff4gw1e77d3nqrv8j203b03cweg.jpg" class="layui-nav-img">
    38.           tester
    39.         a>
    40.         <dl class="layui-nav-child">
    41.           <dd><a href="">Your Profilea>dd>
    42.           <dd><a href="">Settingsa>dd>
    43.           <dd><a href="login.jsp">Sign outa>dd>
    44.         dl>
    45.       li>
    46.       <li class="layui-nav-item" lay-header-event="menuRight" lay-unselect>
    47.         <a href="javascript:;">
    48.           <i class="layui-icon layui-icon-more-vertical">i>
    49.         a>
    50.       li>
    51.     ul>
    52.   div>
    53.   
    54.   <div class="layui-side layui-bg-black">
    55.     <div class="layui-side-scroll">
    56.       
    57.       <ul id="menu" class="layui-nav layui-nav-tree" lay-filter="menu">
    58.          <li class="layui-nav-item layui-nav-itemed">
    59.           <a class="" href="javascript:;">menu group 1a>
    60.           <dl class="layui-nav-child">
    61.             <dd><a href="javascript:;">menu 1a>dd>
    62.             <dd><a href="javascript:;">menu 2a>dd>
    63.             <dd><a href="javascript:;">menu 3a>dd>
    64.             <dd><a href="">the linksa>dd>
    65.           dl>
    66.         li>
    67.         <li class="layui-nav-item">
    68.           <a href="javascript:;">menu group 2a>
    69.           <dl class="layui-nav-child">
    70.             <dd><a href="javascript:;">list 1a>dd>
    71.             <dd><a href="javascript:;">list 2a>dd>
    72.             <dd><a href="">超链接a>dd>
    73.           dl>
    74.         li>
    75.         <li class="layui-nav-item"><a href="javascript:;">click menu itema>li>
    76.         <li class="layui-nav-item"><a href="">the linksa>li>
    77.       ul>
    78.     div>
    79.   div>
    80.   
    81.   <div class="layui-body">
    82.     
    83.     <div style="padding: 15px;">内容主体区域。记得修改 layui.css 和 js 的路径div>
    84.   div>
    85.   
    86.   <div class="layui-footer">
    87.     
    88.             底部固定区域
    89.   div>
    90. div>
    91. body>
    92. html>

    动态树页面效果展示：

     二，获取表中的数据

    将t_oa_permission表中的列名编写在实体类当中，在数据库中使用指令desc * from 表名 查看表结构 以此判断列名的数据类型 

    注意： 数据类型需要保持一致，否则无效

    创建实体类Permission：

    1. package com.zking.entity;
    2.  
    3. //数据库中t_oa_Permission表对应的实体类
    4. public class Permission {
    5. 	private long id;//id
    6. 	private String name;//菜单名
    7. 	private String description;//菜单描述
    8. 	private String url;//点击菜单跳转页面
    9. 	private long pid;//父级菜单的id
    10. 	private int ismenu;//显示顺序
    11. 	private long displayno;//显示的顺序
    12. 	public long getId() {
    13. 		return id;
    14. 	}
    15. 	public void setId(long id) {
    16. 		this.id = id;
    17. 	}
    18. 	public String getName() {
    19. 		return name;
    20. 	}
    21. 	public void setName(String name) {
    22. 		this.name = name;
    23. 	}
    24. 	public String getDescription() {
    25. 		return description;
    26. 	}
    27. 	public void setDescription(String description) {
    28. 		this.description = description;
    29. 	}
    30. 	public String getUrl() {
    31. 		return url;
    32. 	}
    33. 	public void setUrl(String url) {
    34. 		this.url = url;
    35. 	}
    36. 	public long getPid() {
    37. 		return pid;
    38. 	}
    39. 	public void setPid(long pid) {
    40. 		this.pid = pid;
    41. 	}
    42. 	public int getIsmenu() {
    43. 		return ismenu;
    44. 	}
    45. 	public void setIsmenu(int ismenu) {
    46. 		this.ismenu = ismenu;
    47. 	}
    48. 	public long getDisplayno() {
    49. 		return displayno;
    50. 	}
    51. 	public void setDisplayno(long displayno) {
    52. 		this.displayno = displayno;
    53. 	}
    54. 	
    55. 	public Permission() {
    56. 		// TODO Auto-generated constructor stub
    57. 	}
    58. 	public Permission(long id, String name, String description, String url, long pid, int ismenu, long displayno) {
    59. 		super();
    60. 		this.id = id;
    61. 		this.name = name;
    62. 		this.description = description;
    63. 		this.url = url;
    64. 		this.pid = pid;
    65. 		this.ismenu = ismenu;
    66. 		this.displayno = displayno;
    67. 	}
    68. 	@Override
    69. 	public String toString() {
    70. 		return "Permission [id=" + id + ", name=" + name + ", description=" + description + ", url=" + url + ", pid="
    71. 				+ pid + ", ismenu=" + ismenu + ", displayno=" + displayno + "]";
    72. 	}
    73. 	
    74. 	
    75. }
    76.

    PermissionDao方法

    1. package com.zking.dao;
    2.  
    3. import java.util.ArrayList;
    4. import java.util.Iterator;
    5. import java.util.List;
    6.  
    7. import com.zking.entity.Permission;
    8. import com.zking.util.BaseDao;
    9. import com.zking.util.BuildTree;
    10. import com.zking.util.PageBean;
    11. import com.zking.util.TreeVo;
    12.  
    13. public class permissionDao extends BaseDao{
    14. 	
    15. 	//查询t_oa_permission表中的数据
    16. 	public List list(Permission permission, PageBean pageBean) throws Exception {
    17. 		String sql = "select * from t_ao_permission";
    18. 		return super.executeQuery(sql, Permission.class, pageBean);
    19. 	}
    20. 	
    21. 	public List> menus(Permission permission, PageBean pageBean) throws Exception {
    22. 		List> trees = new ArrayList>();
    23. 		//从数据库拿到的菜单数据，此时数据是平级的，不具备父子关系
    24. 		List list = this.list(permission, pageBean);
    25. 		for (Permission p : list) {
    26. 			TreeVo vo = new TreeVo<>();
    27. 			vo.setId(p.getId()+"");
    28. 			vo.setText(p.getName());
    29. 			vo.setParentId(p.getPid()+"");//节点的父id
    30. 			trees.add(vo);
    31. 		}
    32. 		return BuildTree.buildList(trees, "-1");
    33. 	}
    34. 	
    35. 	
    36. 	
    37. }
    38.
    jQuery动态菜单列表（树）
    rar 0星 超过10%的资源 153KB
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    permissionDaoTest 测试

    1. package com.zking.dao;
    2.  
    3. import static org.junit.jupiter.api.Assertions.*;
    4.  
    5. import java.util.List;
    6.  
    7. import org.junit.jupiter.api.Test;
    8.  
    9. import com.fasterxml.jackson.databind.ObjectMapper;
    10. import com.zking.entity.Permission;
    11. import com.zking.util.TreeVo;
    12.  
    13. class PermissionDaoTest {
    14. 	
    15. 	private PermissionDao menudao =new PermissionDao();
    16.  
    17. 	@Test
    18. 	void testList() {
    19. 		try {
    20. 			List list = menudao.list(null, null);
    21. 			for (Permission permission : list) {
    22. 				System.out.println(permission);
    23. 			}
    24. 			ObjectMapper om = new ObjectMapper();
    25. 			System.out.println(om.writeValueAsString(list));
    26. 		} catch (Exception e) {
    27. 			// TODO Auto-generated catch block
    28. 			e.printStackTrace();
    29. 		}
    30. 	}
    31. 	
    32. 	@Test
    33. 	void testMenus() {
    34. 		try {
    35. 			List> list = menudao.menus(null, null);
    36. 			for (TreeVo permission: list) {
    37. 				System.out.println(permission);
    38. 			}
    39. 			ObjectMapper om = new ObjectMapper();
    40. 			System.out.println(om.writeValueAsString(list));
    41. 		} catch (Exception e) {
    42. 			// TODO Auto-generated catch block
    43. 			e.printStackTrace();
    44. 		}
    45. 	}
    46. }

    测试testlist方法：

     测试testMenus方法：

    三，将表中的数据构建父子关系

    BuildTree类：

    1. package com.zking.util;
    2.  
    3. import java.util.ArrayList;
    4. import java.util.HashMap;
    5. import java.util.List;
    6. import java.util.Map;
    7.  
    8. public class BuildTree {
    9.  
    10. 	/**
    11. 	 * 默认-1为顶级节点
    12. 	 * @param nodes
    13. 	 * @param 
    14. 	 * @return
    15. 	 */
    16. 	public static  TreeVo build(List> nodes) {
    17.  
    18. 		if (nodes == null) {
    19. 			return null;
    20. 		}
    21. 		List> topNodes = new ArrayList>();
    22.  
    23. 		for (TreeVo children : nodes) {
    24. 			String pid = children.getParentId();
    25. 			if (pid == null || "-1".equals(pid)) {
    26. 				topNodes.add(children);
    27.  
    28. 				continue;
    29. 			}
    30.  
    31. 			for (TreeVo parent : nodes) {
    32. 				String id = parent.getId();
    33. 				if (id != null && id.equals(pid)) {
    34. 					parent.getChildren().add(children);
    35. 					children.setHasParent(true);
    36. 					parent.setChildren(true);
    37. 					continue;
    38. 				}
    39. 			}
    40.  
    41. 		}
    42.  
    43. 		TreeVo root = new TreeVo();
    44. 		if (topNodes.size() == 1) {
    45. 			root = topNodes.get(0);
    46. 		} else {
    47. 			root.setId("000");
    48. 			root.setParentId("-1");
    49. 			root.setHasParent(false);
    50. 			root.setChildren(true);
    51. 			root.setChecked(true);
    52. 			root.setChildren(topNodes);
    53. 			root.setText("顶级节点");
    54. 			Map state = new HashMap<>(16);
    55. 			state.put("opened", true);
    56. 			root.setState(state);
    57. 		}
    58.  
    59. 		return root;
    60. 	}
    61.  
    62. 	/**
    63. 	 * 指定idparam为顶级节点
    64. 	 * @param nodes
    65. 	 * @param idParam
    66. 	 * @param 
    67. 	 * @return
    68. 	 */
    69. 	public static  List> buildList(List> nodes, String idParam) {
    70. 		if (nodes == null) {
    71. 			return null;
    72. 		}
    73. 		List> topNodes = new ArrayList>();
    74.  
    75. 		for (TreeVo children : nodes) {
    76.  
    77. 			String pid = children.getParentId();
    78. 			if (pid == null || idParam.equals(pid)) {
    79. 				topNodes.add(children);
    80.  
    81. 				continue;
    82. 			}
    83.  
    84. 			for (TreeVo parent : nodes) {
    85. 				String id = parent.getId();
    86. 				if (id != null && id.equals(pid)) {
    87. 					parent.getChildren().add(children);
    88. 					children.setHasParent(true);
    89. 					parent.setChildren(true);
    90.  
    91. 					continue;
    92. 				}
    93. 			}
    94.  
    95. 		}
    96. 		return topNodes;
    97. 	}
    98.  
    99. }

    Treevo实体类：

    1. package com.zking.util;
    2.  
    3. import java.util.ArrayList;
    4. import java.util.List;
    5. import java.util.Map;
    6.  
    7.  
    8. public class TreeVo {
    9. 	/**
    10. 	 * 节点ID
    11. 	 */
    12. 	private String id;
    13. 	/**
    14. 	 * 显示节点id
    15. 	 */
    16. 	private String text;
    17. 	/**
    18. 	 * 节点状态，open closed
    19. 	 */
    20. 	private Map state;
    21. 	/**
    22. 	 *节点是否被选中  true false
    23. 	 */
    24. 	private boolean checked = false;
    25. 	/**
    26. 	 * 节点属性
    27. 	 */
    28. 	private Map attributes;
    29.  
    30. 	/**
    31. 	 * 节点的子节点
    32. 	 */
    33. 	private List> children = new ArrayList>();
    34.  
    35. 	/**
    36. 	 * 父id
    37. 	 */
    38. 	private String parentId;
    39. 	/**
    40. 	 * 是否有父节点
    41. 	 */
    42. 	private boolean hasParent = false;
    43. 	/**
    44. 	 * 是否有子节点
    45. 	 */
    46. 	private boolean hasChildren = false;
    47.  
    48. 	public String getId() {
    49. 		return id;
    50. 	}
    51.  
    52. 	public void setId(String id) {
    53. 		this.id = id;
    54. 	}
    55.  
    56. 	public String getText() {
    57. 		return text;
    58. 	}
    59.  
    60. 	public void setText(String text) {
    61. 		this.text = text;
    62. 	}
    63.  
    64. 	public Map getState() {
    65. 		return state;
    66. 	}
    67.  
    68. 	public void setState(Map state) {
    69. 		this.state = state;
    70. 	}
    71.  
    72. 	public boolean isChecked() {
    73. 		return checked;
    74. 	}
    75.  
    76. 	public void setChecked(boolean checked) {
    77. 		this.checked = checked;
    78. 	}
    79.  
    80. 	public Map getAttributes() {
    81. 		return attributes;
    82. 	}
    83.  
    84. 	public void setAttributes(Map attributes) {
    85. 		this.attributes = attributes;
    86. 	}
    87.  
    88. 	public List> getChildren() {
    89. 		return children;
    90. 	}
    91.  
    92. 	public void setChildren(List> children) {
    93. 		this.children = children;
    94. 	}
    95.  
    96. 	public boolean isHasParent() {
    97. 		return hasParent;
    98. 	}
    99.  
    100. 	public void setHasParent(boolean isParent) {
    101. 		this.hasParent = isParent;
    102. 	}
    103.  
    104. 	public boolean isHasChildren() {
    105. 		return hasChildren;
    106. 	}
    107.  
    108. 	public void setChildren(boolean isChildren) {
    109. 		this.hasChildren = isChildren;
    110. 	}
    111.  
    112. 	public String getParentId() {
    113. 		return parentId;
    114. 	}
    115.  
    116. 	public void setParentId(String parentId) {
    117. 		this.parentId = parentId;
    118. 	}
    119.  
    120. 	public TreeVo(String id, String text, Map state, boolean checked, Map attributes,
    121.                   List> children, boolean isParent, boolean isChildren, String parentID) {
    122. 		super();
    123. 		this.id = id;
    124. 		this.text = text;
    125. 		this.state = state;
    126. 		this.checked = checked;
    127. 		this.attributes = attributes;
    128. 		this.children = children;
    129. 		this.hasParent = isParent;
    130. 		this.hasChildren = isChildren;
    131. 		this.parentId = parentID;
    132. 	}
    133.  
    134. 	public TreeVo() {
    135. 		super();
    136. 	}
    137.  
    138. }
    layui ztree 下拉树代码-Javascript代码类资源
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    permissionDao

    1. package com.zking.dao;
    2.  
    3. import java.util.ArrayList;
    4. import java.util.Iterator;
    5. import java.util.List;
    6.  
    7. import com.zking.entity.Permission;
    8. import com.zking.util.BaseDao;
    9. import com.zking.util.BuildTree;
    10. import com.zking.util.PageBean;
    11. import com.zking.util.TreeVo;
    12.  
    13. public class permissionDao extends BaseDao{
    14. 	public List> menus(Permission permission, PageBean pageBean) throws Exception {
    15. 		List> trees = new ArrayList>();
    16. 		//从数据库拿到的菜单数据，此时数据是平级的，不具备父子关系
    17. 		List list = this.list(permission, pageBean);
    18. 		for (Permission p : list) {
    19. 			TreeVo vo = new TreeVo<>();
    20. 			vo.setId(p.getId()+"");
    21. 			vo.setText(p.getName());
    22. 			vo.setParentId(p.getPid()+"");//节点的父id
    23. 			trees.add(vo);
    24. 		}
    25. 		return BuildTree.buildList(trees, "-1");
    26. 	}
    27. }
    28.

    四、前端代码

    建立一个PermissionAction：

    1. package com.zking.web;
    2.  
    3. import java.util.List;
    4.  
    5. import javax.servlet.http.HttpServletRequest;
    6. import javax.servlet.http.HttpServletResponse;
    7.  
    8. import com.zking.dao.permissionDao;
    9. import com.zking.entity.Permission;
    10. import com.zking.framework.ActionSupport;
    11. import com.zking.framework.ModelDriver;
    12. import com.zking.util.ResponseUtil;
    13. import com.zking.util.TreeVo;
    14.  
    15. public class PermissionAction extends ActionSupport implements ModelDriver{
    16.  
    17. 	private Permission permission = new Permission();
    18. 	permissionDao permissiondao = new permissionDao();
    19. 	@Override
    20. 	public Permission getModel() {
    21. 		return permission;
    22. 	}
    23. 	
    24. 	
    25. 	public String menus(HttpServletRequest req, HttpServletResponse resp) {
    26. 		try {
    27. 			List> menus = permissiondao.menus(null, null);
    28. 			//向前端响应数据
    29. 			ResponseUtil.writeJson(resp, menus);
    30. 		} catch (Exception e) {
    31. 			e.printStackTrace();
    32. 		}
    33. 		return null;
    34. 	}
    35.  
    36. }
    37.

    修改main界面（主界面）：

    1. <%@ page language="java" contentType="text/html; charset=UTF-8"
    2.     pageEncoding="UTF-8"%>
    3.     <%@ include file="common/head.jsp" %>
    4. html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    5. <html>
    6. <head>
    7. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    8. <title>Insert title heretitle>
    9. head>
    10. <body>
    11. <div class="layui-layout layui-layout-admin">
    12.   <div class="layui-header">
    13.     <div class="layui-logo layui-hide-xs layui-bg-black">layout demodiv>
    14.     
    15.     <ul class="layui-nav layui-layout-left">
    16.       
    17.       <li class="layui-nav-item layui-show-xs-inline-block layui-hide-sm" lay-header-event="menuLeft">
    18.         <i class="layui-icon layui-icon-spread-left">i>
    19.       li>
    20.       
    21.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 1a>li>
    22.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 2a>li>
    23.       <li class="layui-nav-item layui-hide-xs"><a href="">nav 3a>li>
    24.       <li class="layui-nav-item">
    25.         <a href="javascript:;">nav groupsa>
    26.         <dl class="layui-nav-child">
    27.           <dd><a href="">menu 11a>dd>
    28.           <dd><a href="">menu 22a>dd>
    29.           <dd><a href="">menu 33a>dd>
    30.         dl>
    31.       li>
    32.     ul>
    33.     
    34.     <ul class="layui-nav layui-layout-right">
    35.       <li class="layui-nav-item layui-hide layui-show-md-inline-block">
    36.         <a href="javascript:;">
    37.           <img src="//tva1.sinaimg.cn/crop.0.0.118.118.180/5db11ff4gw1e77d3nqrv8j203b03cweg.jpg" class="layui-nav-img">
    38.           tester
    39.         a>
    40.         <dl class="layui-nav-child">
    41.           <dd><a href="">Your Profilea>dd>
    42.           <dd><a href="">Settingsa>dd>
    43.           <dd><a href="login.jsp">Sign outa>dd>
    44.         dl>
    45.       li>
    46.       <li class="layui-nav-item" lay-header-event="menuRight" lay-unselect>
    47.         <a href="javascript:;">
    48.           <i class="layui-icon layui-icon-more-vertical">i>
    49.         a>
    50.       li>
    51.     ul>
    52.   div>
    53.   
    54.   <div class="layui-side layui-bg-black">
    55.     <div class="layui-side-scroll">
    56.       
    57.       <ul id="menu" class="layui-nav layui-nav-tree" lay-filter="menu">
    58.          <li class="layui-nav-item layui-nav-itemed">
    59.           <a class="" href="javascript:;">menu group 1a>
    60.           <dl class="layui-nav-child">
    61.             <dd><a href="javascript:;">menu 1a>dd>
    62.             <dd><a href="javascript:;">menu 2a>dd>
    63.             <dd><a href="javascript:;">menu 3a>dd>
    64.             <dd><a href="">the linksa>dd>
    65.           dl>
    66.         li>
    67.         <li class="layui-nav-item">
    68.           <a href="javascript:;">menu group 2a>
    69.           <dl class="layui-nav-child">
    70.             <dd><a href="javascript:;">list 1a>dd>
    71.             <dd><a href="javascript:;">list 2a>dd>
    72.             <dd><a href="">超链接a>dd>
    73.           dl>
    74.         li>
    75.         <li class="layui-nav-item"><a href="javascript:;">click menu itema>li>
    76.         <li class="layui-nav-item"><a href="">the linksa>li>
    77.       ul>
    78.     div>
    79.   div>
    80.   
    81.   <div class="layui-body">
    82.     
    83.     <div style="padding: 15px;">内容主体区域。记得修改 layui.css 和 js 的路径div>
    84.   div>
    85.   
    86.   <div class="layui-footer">
    87.     
    88.             底部固定区域
    89.   div>
    90. div>
    91. <script type="text/javascript">
    92. 	 layui.use(['jquery'],function(){
    93. 		let $ = layui.jquery;
    94. 		$.ajax({
    95. 			url:"${pageContext.request.contextPath}/permission.action?methodName=menus",
    96. 			dataType:'json',
    97. 			success:function(data){
    98. 				let html = '';
    99. 				$.each(data,function(i,n){
    100. 					html +='
    101. ';
  • html +=' '+data[i].text+'';
  • //判断当前一级节点是否存在节点
  • if(data[i].hasChildren){
  • html +='
    ';
  • let childern = data[i].children;
  • $.each(childern,function(index,node){
  • html+='
    '+childern[index].text+'
    '    ;
  • })
  • html +=' ';
  • }
  • html +='
    • ';
  • });
  • $("#menu").html(html);
  • }
  • })
  • })
  • script>
  • body>
  • html>

    • 最终结果：

     下一期我们将对本期内容进行巩固，切换一张数据表来进行同样的展示 若本期内容有误或者不足还望指出！

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  • 原文地址：https://blog.csdn.net/weixin_64313980/article/details/125813842