ElementUI中Tree组件使用(element-ui tree)

ElementUI中Tree组件使用

推荐整理分享ElementUI中Tree组件使用(element-ui tree)，希望有所帮助，仅作参考，欢迎阅读内容。

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       首先官网上的树形控件教程地址为Element - The world's most popular Vue UI framework

案例一：

要实现这种类型的树控件，并且后边相关操作：

1.1后端准备工作

 首先，数据库表为：

 查询接口返回的实体类为：

@Data@NoArgsConstructor@RequiredArgsConstructor // 有参构造@EqualsAndHashCode(callSuper = false ,of = "name")// 表示以name去重写的Equals和HashCode@Accessors(chain = true)@TableName("t_department")@ApiModel(value="Department对象", description="")public class Department implements Serializable { private static final long serialVersionUID = 1L; @ApiModelProperty(value = "id") @TableId(value = "id", type = IdType.AUTO) private Integer id; @ApiModelProperty(value = "部门名称") @Excel(name = "部门") @NonNull private String name; @ApiModelProperty(value = "父id") private Integer parentId; @ApiModelProperty(value = "路径") private String depPath; @ApiModelProperty(value = "是否启用") private Boolean enabled; @ApiModelProperty(value = "是否上级") private Boolean isParent; @ApiModelProperty(value = "子部门列表") @TableField(exist = false) private List<Department> children; @ApiModelProperty(value = "返回结果，存储过程使用") @TableField(exist = false) private Integer result;}

查询接口返回的数据格式：通过属性 children来判断是否有子节点

[ { "id": 1, "name": "股东会", "parentId": -1, "depPath": ".1", "enabled": true, "isParent": true, "children": [ { "id": 2, "name": "董事会", "parentId": 1, "depPath": ".1.2", "enabled": true, "isParent": true, "children": [ { "id": 3, "name": "总办", "parentId": 2, "depPath": ".1.2.3", "enabled": true, "isParent": true, "children": [ { "id": 4, "name": "财务部", "parentId": 3, "depPath": ".1.2.3.4", "enabled": true, "isParent": false, "children": [], "result": null }, { "id": 5, "name": "市场部", "parentId": 3, "depPath": ".1.2.3.5", "enabled": true, "isParent": true, "children": [ { "id": 6, "name": "华东市场部", "parentId": 5, "depPath": "1.2.3.5.6", "enabled": true, "isParent": true, "children": [ { "id": 8, "name": "上海市场部", "parentId": 6, "depPath": "1.2.3.5.6.8", "enabled": true, "isParent": false, "children": [], "result": null } ], "result": null }, { "id": 7, "name": "华南市场部", "parentId": 5, "depPath": "1.2.3.5.7", "enabled": true, "isParent": false, "children": [], "result": null }, { "id": 9, "name": "西北市场部", "parentId": 5, "depPath": ".1.2.3.5.9", "enabled": true, "isParent": true, "children": [ { "id": 10, "name": "贵阳市场", "parentId": 9, "depPath": ".1.2.3.5.9.10", "enabled": true, "isParent": true, "children": [ { "id": 11, "name": "乌当区市场", "parentId": 10, "depPath": ".1.2.3.5.9.10.11", "enabled": true, "isParent": false, "children": [], "result": null } ], "result": null } ], "result": null } ], "result": null }, { "id": 12, "name": "技术部", "parentId": 3, "depPath": ".1.2.3.12", "enabled": true, "isParent": false, "children": [], "result": null }, { "id": 13, "name": "运维部", "parentId": 3, "depPath": ".1.2.3.13", "enabled": true, "isParent": false, "children": [], "result": null } ], "result": null } ], "result": null }, { "id": 150, "name": "aaa", "parentId": 1, "depPath": ".1.150", "enabled": true, "isParent": true, "children": [ { "id": 151, "name": "abbb", "parentId": 150, "depPath": ".1.150.151", "enabled": true, "isParent": false, "children": [], "result": null } ], "result": null }, { "id": 154, "name": "ccc", "parentId": 1, "depPath": ".1.154", "enabled": true, "isParent": false, "children": [], "result": null }, { "id": 157, "name": "dddd", "parentId": 1, "depPath": ".1.157", "enabled": true, "isParent": false, "children": [], "result": null } ], "result": null }]1.2前端代码

从官网上复制一个模板过来，搜索的话，直接往下找一个有搜索框的，把搜索框复制过来，复制好就可以开始修改，写增删改查的方法调用了。

 写好的代码如下：

<template> <div style="width: 550px;"> <el-input placeholder="请输入部门名称进行搜索..." prefix-icon="el-icon-search" v-model="filterText"> </el-input> <el-tree :data="deps" :props="defaultProps" :filter-node-method="filterNode" :expand-on-click-node="false" ref="tree"> <!-- slot-scope可以自定义树节点里的内容，node当前节点的node对象，data后端对应返回的数据 --> <span class="custom-tree-node" slot-scope="{ node, data }" style="display:flex; justify-content: space-between;width: 100%;"> <span>{{ data.name }}</span> <span> <el-button type="primary" size="mini" class="depBtn" @click="() => showAddDep(data)"> 添加部门 </el-button> <el-button type="danger" size="mini" class="depBtn" @click="() => deleteDep(data)"> 删除部门 </el-button> </span> </span> </el-tree> <!-- 添加部门的弹出框 --> <el-dialog title="添加部门" :visible.sync="dialogVisible" width="30%"> <div> <table> <tr> <td><el-tag>上级部门</el-tag></td> <td><el-tag>{{pname}}</el-tag></td> </tr> <tr> <td><el-tag>部门名称</el-tag></td> <td><el-input v-model="dep.name" placeholder="请输入部门名称..."></el-input></td> </tr> </table> </div> <span slot="footer" class="dialog-footer"> <el-button @click="dialogVisible = false">取 消</el-button> <el-button type="primary" @click="doAddDep">确 定</el-button> </span> </el-dialog> </div></template><script>export default { data(){ return{ // 树的搜索条件 filterText: '', // 树的数据 deps: [], // 树的配置 defaultProps: { children: 'children', label: 'name' }, // 添加弹出框 dialogVisible: false, // 添加的部门数据 dep:{ name:'', parentId: -1 }, // 上级部门名称 pname: '' } }, mounted(){ this.initDeps(); }, methods: { // 初始化数据 initDeps(){ this.getRequest('/system/basic/department/').then(resp=>{ this.deps = resp; }) }, // 树的搜索 filterNode(value, data) { if (!value) return true; return data.name.indexOf(value) !== -1; }, // 添加弹框 showAddDep(data){ console.log(data) this.dep.parentId = data.id; this.pname = data.name; this.dialogVisible = 'true' }, // 添加 doAddDep(){ this.postRequest('/system/basic/department/',this.dep).then(resp=>{ if(resp.code==200){ resp.obj.children = [] this.addDep2Deps(this.deps,resp.obj); this.initDep(); this.dialogVisible = false; } }) }, initDep(){ this.dep = { name: '', parentId: -1 } this.panme = '' }, // 添加成功后手动的给树加数据 addDep2Deps(deps,dep){ for(let i = 0; i<deps.length; i++){ let d= deps[i]; if(d.id == dep.parentId){ d.children = d.children.concat(dep); if(d.children.length>0){ d.isParent = true; } return; }else{ // 递归 this.addDep2Deps(d.children,dep); } } }, // 删除 deleteDep(data){ console.log(data) if(data.isParent){ this.$message.error("父部门无法删除"); }else{ this.$confirm('此操作将永久['+data.name+']部门, 是否继续?', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }).then(() => { this.deleteRequest('/system/basic/department/'+data.id).then(resp=>{ if(resp.code==200){ this.removeDepFromDeps(null,this.deps,data.id); } }) }).catch(() => { this.$message({ type: 'info', message: '已取消删除' }); }); } }, // 手动删除 (父部门，总部门数据，要删除的部门id) removeDepFromDeps(p,deps,id){ for(let i=0; i<deps.length; i++){ let d = deps[i]; if(d.id==id){ deps.splice(i,1); if(deps.length==0){ p.isParent = false; } return; }else{ this.removeDepFromDeps(d,d.children,id); } } } }, watch: { filterText(val) { this.$refs.tree.filter(val); } }}</script><style>.depBtn{ padding: 3px;}</style>

需要注意的是：

1：树组件中    :data="deps" 加载树组建的数据。:props="defaultProps" 加载树组件的配置，其中label是给个枝叶的名字对应的字段，children是子节点对应的字段。:filter-node-method="filterNode" 树组件的搜索,filterNode过滤的回调，这个官网拷贝即可。:expand-on-click-node="false" 关闭点击折叠，只有点击前面的小三角才能展开折叠。

2：搜索框绑定的数据filterText，下面监听这个数据的改变，如果改变了，就调用树的filter方法（this.$refs.tree.filter(val);），进行过滤，这个方法的回调在树组件的属性中定义:filter-node-method="filterNode" ，也就是输入框值改变了，会去掉filterNode这个方法，这个方法传入两个值，value是文本框输入值，data是树组件的数据，value为空直接返回，不为空则过滤。

3： 添加部门的时候，添加成功后不能单纯的掉接口，重新请求一次树中的数据，这样的话，每添加一个部门，整个树就会折叠起来。这时候就需要不调接口请求新的数据，在js中操作树中的数据this.deps，让它和数据库保持同步。首先在成功后调用方法： addDep2Deps(deps,dep)  这个方法第一个参数是整个树中的数据，第二个参数是新添加的树的数据（这个数据是添加成功接口回显的数据，也就是添加的这条记录信息）在这个方法中，会循环，找到对应的父节点，给它的子节点拼接数据，修改父节点isParent属性（是否有孩子），之后就一直递归，知道添加完成为止。这个数据添加成功后，清空弹出框中输入的信息，关闭弹出框。

4：删除操作，同样，删除时也要手动的在js中把这条数据删除，不能请求新数据，请求新数据会导致树整个关闭，用户体验十分不好，需要在js中把树中的数据和数据库中进行同步。

调用接口删除成功后，调用removeDepFromDeps(p,deps,id)方法，在js中进行数据删除，调用时，第一个参数传null表示从顶层节点开始往下找，第二个参数是树的数据，第三个参数是要删除部门的id。同样进行循环，添加中比较的是父节点的id，删除是，比较的就是这个叶子的id，如果相同，那就删除，同时，判断把这个叶子删掉后，这个枝下面还有没有叶子，因为有叶子的枝是不能删除的，所以要再判断一下修改isParent的状态，之后还是一样，在一层中没有查询到的话，就递归到下一层去找。

案例二

这种前面带有选择框的，进行授权操作 

2.1后端准备

对应的数据库表

 对应的实体类：

@Data@EqualsAndHashCode(callSuper = false)@Accessors(chain = true)@TableName("t_menu")@ApiModel(value="Menu对象", description="")public class Menu implements Serializable { private static final long serialVersionUID = 1L; @ApiModelProperty(value = "id") @TableId(value = "id", type = IdType.AUTO) private Integer id; @ApiModelProperty(value = "url") private String url; @ApiModelProperty(value = "path") private String path; @ApiModelProperty(value = "组件") private String component; @ApiModelProperty(value = "菜单名") private String name; @ApiModelProperty(value = "图标") private String iconCls; @ApiModelProperty(value = "是否保持激活") private Boolean keepAlive; @ApiModelProperty(value = "是否要求权限") private Boolean requireAuth; @ApiModelProperty(value = "父id") private Integer parentId; @ApiModelProperty(value = "是否启用") private Boolean enabled; @ApiModelProperty(value = "子菜单") @TableField(exist = false) // 告诉mybatisplus这个字段不在表中，查询的时候不要去查 private List<Menu> children; @ApiModelProperty(value = "角色列表") @TableField(exist = false) private List<Role> roles;}

 查询接口返回的数据

{ "code": 200, "message": "查询成功", "obj": [ { "id": 1, "url": null, "path": null, "component": null, "name": "所有", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 2, "url": null, "path": null, "component": null, "name": "员工资料", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 7, "url": null, "path": null, "component": null, "name": "基本资料", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 8, "url": null, "path": null, "component": null, "name": "高级资料", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null } ], "roles": null }, { "id": 3, "url": null, "path": null, "component": null, "name": "人事管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 9, "url": null, "path": null, "component": null, "name": "员工资料", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 10, "url": null, "path": null, "component": null, "name": "员工奖惩", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 11, "url": null, "path": null, "component": null, "name": "员工培训", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 12, "url": null, "path": null, "component": null, "name": "员工调薪", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 13, "url": null, "path": null, "component": null, "name": "员工调动", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null } ], "roles": null }, { "id": 4, "url": null, "path": null, "component": null, "name": "薪资管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 14, "url": null, "path": null, "component": null, "name": "工资账套管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 15, "url": null, "path": null, "component": null, "name": "员工账套设置", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 16, "url": null, "path": null, "component": null, "name": "工资表管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 17, "url": null, "path": null, "component": null, "name": "月末处理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 18, "url": null, "path": null, "component": null, "name": "工资表查询", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null } ], "roles": null }, { "id": 5, "url": null, "path": null, "component": null, "name": "统计管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 19, "url": null, "path": null, "component": null, "name": "综合信息统计", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 20, "url": null, "path": null, "component": null, "name": "员工积分统计", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 21, "url": null, "path": null, "component": null, "name": "人事信息统计", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 22, "url": null, "path": null, "component": null, "name": "人事记录统计", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null } ], "roles": null }, { "id": 6, "url": null, "path": null, "component": null, "name": "系统管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": [ { "id": 23, "url": null, "path": null, "component": null, "name": "基础信息设置", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 24, "url": null, "path": null, "component": null, "name": "系统管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 25, "url": null, "path": null, "component": null, "name": "操作日志管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 26, "url": null, "path": null, "component": null, "name": "操作员管理", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 27, "url": null, "path": null, "component": null, "name": "备份恢复数据库", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null }, { "id": 28, "url": null, "path": null, "component": null, "name": "初始化数据库", "iconCls": null, "keepAlive": null, "requireAuth": null, "parentId": null, "enabled": null, "children": null, "roles": null } ], "roles": null } ], "roles": null } ]}2.2前端代码<template> <div> <!-- 添加角色 --> <div class="permissManaTool"> <el-input size="small" placeholder="请输入角色英文名" v-model="role.name"> <template slot="prepend">ROLE_</template> </el-input> <el-input size="small" placeholder="请输入角色中文名" v-model="role.nameZh" @keydown.enter.native="addRole"></el-input> <el-button size="small" type="primary" icon="el-icon-plus" @click="addRole">添加角色</el-button> </div> <!-- 手风琴 --> <div style="margin-top:10px; width:660px"> <el-collapse v-model="activeName" accordion @change="change"> <el-collapse-item :title="r.nameZh" :name="r.id" v-for="(r,index) in roles" :key="index"> <!-- 卡片 --> <el-card class="box-card"> <div slot="header" class="clearfix"> <span>可访问资源</span> <el-button style="float: right; padding: 3px 0; color: #ff0000;" type="text" icon="el-icon-delete" @click="doDeleteRole(r)"></el-button> </div> <div> <!-- 树 --> <el-tree show-checkbox node-key="id" ref="tree" :key="index" :default-checked-keys="selectMenus" :data="allMenus" :props="defaultProps"></el-tree> <div style="display:flex; justify-content: flex-end"> <el-button size="mini" @click="cancelUpdate">取消修改</el-button> <el-button size="mini" type="primary" @click="doUpdate(r.id,index)">确定修改</el-button> </div> </div> </el-card> </el-collapse-item> </el-collapse> </div> </div></template><script>export default { data(){ return{ role:{ name:'', nameZh:'' }, activeName : '-1', roles:[], allMenus: [], // 树菜单的属性，children子菜单的属性，label显示出来的名字,都是后端接口返回来的字段名字 defaultProps: { children: 'children', label: 'name' }, // 树中选中的节点 selectMenus: [] } }, mounted(){ this.initRoles(); }, methods:{ // 初始化所有菜单 initAllMenus(){ this.getRequest('/system/basic/permiss/menus').then(resp=>{ if(resp.code==200){ this.allMenus = resp.obj; } }) }, // 根据角色id获取菜单 initSelectdMenus(rid){ this.getRequest('/system/basic/permiss/mid/'+rid).then(resp=>{ if(resp.code==200){ this.selectMenus = resp.obj; } }) }, // 获取角色列表 initRoles(){ this.getRequest('/system/basic/permiss/').then(resp=>{ if(resp.code==200){ this.roles = resp.obj; } }) }, // 手风琴点击事件，展开rid是每个name，name对应着后端字段id，关闭时rid为空 change(rid){ if(rid){ this.initAllMenus(); this.initSelectdMenus(rid); } }, // 修改角色权限 doUpdate(rid,index){ // 拿到这个手风琴下面的树 let tree = this.$refs.tree[index]; // 传true只打印叶子节点的id let selectedKeys = tree.getCheckedKeys(true); let url = '/system/basic/permiss/?rid='+ rid; selectedKeys.forEach(key => { url += '&mids='+ key; }); this.putRequest(url).then(resp=>{ if(resp.code==200){ this.activeName = '-1' } }) }, cancelUpdate(){ this.activeName = '-1' }, // 添加角色 addRole(){ if(this.role.name && this.role.nameZh){ this.postRequest('/system/basic/permiss/',this.role).then(resp=>{ if(resp.code==200){ this.initRoles(); this.role.name = ''; this.role.nameZh = ''; } }) }else{ this.$message.error("所有字段不能为空"); } }, // 删除角色 doDeleteRole(role){ this.$confirm('此操作将永久删除'+role.nameZh+'角色, 是否继续?', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' }).then(() => { this.deleteRequest('/system/basic/permiss/role/'+r.id).then(resp => { if(resp.code == 200){ this.initRoles(); }else{ this.$message.error(resp.message) } }) }).catch(() => { this.$message({ type: 'info', message: '已取消删除' }); }); } }}</script><style>.permissManaTool{ display: flex; justify-content: flex-start;}.permissManaTool .el-input{ width: 300px; margin-right: 10px;}</style>

值得注意的是：

1：每个角色下面展开的权限树列表用的是手风琴组件（折叠面板）这里还要给树加上key，因为每个手风琴下面都是一个树 折叠面板饿了吗官网

2：树要展示前面的选择框，要给树组件加上show-checkbox属性。:default-checked-keys="selectMenus" 默认选中的key，这个selectMenus需要去data中定义一个数组。

3：在添加时，可通过 let tree = this.$refs.tree[index]; 拿到整个手风琴下面的树，let selectedKeys = tree.getCheckedKeys(true) 获取选中节点的id，修改成功后，把手风琴的折叠属性，定义成-1，折叠即可，因为下次再打开的时候，会去数据库查出这个角色对应菜单的最新数据。