ElementUI tree控件怎么通过子节点去找到父节点
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const parentList = []function getParent (node)
// 判断当前节点是否有父节点，并且父节点上的data不能是数组
if (node.parent && !Array.isArray(node.parent.data))
// 将父节点上data的menuid存储在 `parentlist` 里
node.parent.data instanceof Object && this.parentList.push(node.parent.data.id)
// 递归调用 父节点上有父节点
getParent(node.parent)
// 当父节点上data是数组时点击对象为当前tree最高目录 并且parentList必须是0
else if (this.parentList.length === 0)
// 存储当前节点的id到parentList
this.parentList.push(node.data.id)
这是我的业务需求，可以根据自己的业务需求更改所要拿到的数据
参考技术A TreeNode parentNode = e.Node.Parent; if (parentNode != null) foreach (TreeNode tn in parentNode.Nodes) if (tn != e.Node) tn.Collapse(); else foreach (TreeNode tn in tree.Nodes) if (tn != e.Node) tn.Collapse(); 本回答被提问者采纳elementui Tree 树形控件增删改查
数据表结构：
前端代码
axios.js
import axios from ‘axios‘; import Qs from ‘qs‘; import {Message} from ‘element-ui‘; axios.defaults.baseURL = "/"; // 设置请求超时时间 axios.defaults.timeout = 30000; // 设置post请求头 axios.defaults.headers.post[‘Content-Type‘] = ‘application/json;charset=UTF-8‘; // 请求拦截 axios.interceptors.request.use(config => { // 在发送请求之前做些什么 验证token之类的 return config; }, error => { // 对请求错误做些什么 Message.error({message: ‘请求超时!‘}) return Promise.error(error); }) // 响应拦截 axios.interceptors.response.use(response => { // 对响应数据做点什么 return response; }, error => { // 对响应错误做点什么 return Promise.reject(error); }); // 封装get方法和post方法 /** * get方法，对应get请求 * @param {String} url [请求的url地址] * @param {Object} params [请求时携带的参数] */ export function get(url, params) { return new Promise((resolve, reject) => { axios.get(url, { params: params }).then(res => { resolve(res.data); // Loading.service(true).close(); // Message({message: ‘请求成功‘, type: ‘success‘}); }).catch(err => { reject(err.data) // Loading.service(true).close(); Message({message: ‘加载失败‘, type: ‘error‘}); }) }); } /** * post方法，对应post请求 * @param {String} url [请求的url地址] * @param {Object} params [请求时携带的参数] */ export function post(url, params) { return new Promise((resolve, reject) => { axios.post(url, params) .then(res => { resolve(res.data); // Loading.service(true).close(); // Message({message: ‘请求成功‘, type: ‘success‘}); }) .catch(err => { reject(err.data) // Loading.service(true).close(); Message({message: ‘加载失败‘, type: ‘error‘}); }) }); } /** * post方法，参数序列化 * @param {String} url [请求的url地址] * @param {Object} params [请求时携带的参数] */ export function qspost(url, params) { return new Promise((resolve, reject) => { axios.post(url, Qs.stringify(params)) .then(res => { resolve(res.data); // Loading.service(true).close(); // Message({message: ‘请求成功‘, type: ‘success‘}); }) .catch(err => { reject(err.data) // Loading.service(true).close(); Message({message: ‘加载失败‘, type: ‘error‘}); }) }); } /** * put方法，对应put请求 * @param {String} url [请求的url地址] * @param {Object} params [请求时携带的参数] */ export function put(url, params) { return new Promise((resolve, reject) => { axios.put(url, params) .then(res => { resolve(res.data); // Loading.service(true).close(); // Message({message: ‘请求成功‘, type: ‘success‘}); }) .catch(err => { reject(err.data) // Loading.service(true).close(); Message({message: ‘加载失败‘, type: ‘error‘}); }) }); } /** * delete * @param {String} url [请求的url地址] * @param {Object} params [请求时携带的参数] */ export function deletefn(url, params) { return new Promise((resolve, reject) => { axios.delete(url, params) .then(res => { resolve(res.data); // Loading.service(true).close(); // Message({message: ‘请求成功‘, type: ‘success‘}); }) .catch(err => { reject(err.data) // Loading.service(true).close(); Message({message: ‘加载失败‘, type: ‘error‘}); }) }); }
category.js
import {post, get, deletefn, put} from ‘../../utils/axios/axios‘
//获取分类
export const getCategoryList = data => get(‘/item/category/list‘);
//新增一级菜单
export const addCategory = data=> post("/item/category/add",data);
//根据id删除节点
export const deleteCategoryById=data=>deletefn(`/item/category/${data.id}`,data);
//新增子节点
export const addCategoryByParentId=data=>post(`/item/category/addByParentId`,data);
//根据id编辑节点
export const editCategoryById=data=>put(`/item/category/${data.id}`,data);
category.vue
<template>
<el-card class="box-card">
<!--面包屑-->
<el-breadcrumb separator-class="el-icon-arrow-right">
<el-breadcrumb-item>商品管理</el-breadcrumb-item>
<el-breadcrumb-item>分类管理</el-breadcrumb-item>
</el-breadcrumb>
<el-button @click="addCategoryDialog()" style="margin-top: 20px">增加</el-button>
<!--新增一级对话框-->
<el-dialog
title="新增一级"
:visible.sync="addDialogVisible"
width="30%"
>
<el-form ref="form" :model="addForm" label-width="80px">
<el-form-item label="名称">
<el-input v-model="addForm.name"></el-input>
</el-form-item>
</el-form>
<el-button @click="addDialogVisible = false">取 消</el-button>
<el-button type="primary" @click="submitCategory">确 定</el-button>
</el-dialog>
<!--tree-->
<el-tree
:props="defaultProps"
:data="treeData"
show-checkbox
node-key="id"
:default-expand-all="false"
:expand-on-click-node="false">
<span class="custom-tree-node" slot-scope="{ node, data }">
<span>{{ node.label }}</span>
<span>
<el-button
type="text"
size="mini"
@click="() => append(data.id,data.isParent)">
增加
</el-button>
<el-button
type="text"
size="mini"
@click="() => remove(data.id)">
删除
</el-button>
<el-button
type="text"
size="mini"
@click="() => edit(data.id,data.isParent,data.parentId,data.name)">
编辑
</el-button>
</span>
</span>
</el-tree>
<!--新增子菜单对话框-->
<el-dialog
title="新增子菜单"
:visible.sync="addCategoryByParentIdDialogVisible"
width="30%"
>
<el-form ref="form" :model="addForm" label-width="80px">
<el-form-item label="名称">
<el-input v-model="addForm.name"></el-input>
</el-form-item>
</el-form>
<el-button @click="addCategoryByParentIdDialogVisible = false">取 消</el-button>
<el-button type="primary" @click="submitCategoryByParentId">确 定</el-button>
</el-dialog>
<!--编辑节点对话框-->
<el-dialog
title="编辑"
:visible.sync="editCategoryByParentIdDialogVisible"
width="30%"
>
<el-form ref="form" :model="addForm" label-width="80px">
<el-form-item label="名称">
<el-input v-model="addForm.name"></el-input>
</el-form-item>
</el-form>
<el-button @click="editCategoryByParentIdDialogVisible = false">取 消</el-button>
<el-button type="primary" @click="submitEditCategoryById">确 定</el-button>
</el-dialog>
</el-card>
</template>
<script>
import {getCategoryList,addCategory,deleteCategoryById,addCategoryByParentId,editCategoryById} from "../../api/item/category";
export default {
name: "Category",
data() {
return {
treeData: [],
defaultProps: {
label: ‘name‘
},
addDialogVisible: false,
addForm: {
name: ‘‘
},
addCategoryByParentIdDialogVisible:false,
parentId:‘‘,
isParent:‘‘,
id:‘‘,
editCategoryByParentIdDialogVisible:false
}
},
created() {
this.getlist();
},
methods: {
/**
* 获取数据
*/
getlist() {
getCategoryList().then(res => {
console.log("res")
console.log(res)
console.log("~~~~~~~~~")
this.treeData = this.arraytotree(res.data);
console.log(this.treeData)
}).catch(res => {
})
},
handleNodeClick(data) {
console.log(data);
},
//数组转化为树
arraytotree(arr) {
var top = [], sub = [], tempObj = {};
arr.forEach(function (item) {
if (item.parentId === 0) { // 顶级分类
top.push(item)
} else {
sub.push(item) // 其他分类
}
item.children = []; // 默然添加children属性
tempObj[item.id] = item // 用当前分类的id做key，存储在tempObj中
})
sub.forEach(function (item) {
// 取父级
var parent = tempObj[item.parentId] || {‘children‘: []}
// 把当前分类加入到父级的children中
parent.children.push(item)
})
return top
},
addCategoryDialog() {
this.addDialogVisible = true;
},
/**
* 新增一级目录
*/
submitCategory(){
addCategory(this.addForm).then(res=>{
console.log(res)
if (res.code===200){
this.$message({
type: ‘success‘,
message: ‘新增一级目录成功‘
});
this.addForm={}
this.addDialogVisible=false
this.getlist();
}
if (res.code===601){
this.$message({
type: ‘error‘,
message: ‘已存在相同的一级目录‘
});
this.addForm={}
this.addDialogVisible=false
this.getlist();
}
}).catch(res=>{
})
},
append(id,isParent) {
this.id=id
this.isParent=isParent
console.log(id)
console.log(isParent)
this.addCategoryByParentIdDialogVisible=true;
},
/**
* 新增子节点
*/
submitCategoryByParentId(){
//把新增子节点的parentId设置为获取到的节点id
addCategoryByParentId({name:this.addForm.name,isParent:this.isParent,parentId:this.id}).then(res=>{
if (res.code===200){
this.$message({
type:‘success‘,
message:‘新增成功‘
})
this.addCategoryByParentIdDialogVisible=false;
this.addForm={}
this.getlist();
}
}).catch(res=>{
})
},
/**
* 通过id删除节点
* @param id
*/
remove(id) {
console.log(id)
deleteCategoryById({id:id}).then(res=>{
if (res.data===200){
this.$message({
type: ‘success‘,
message: ‘删除成功‘
});
}
this.getlist();
}).catch(res=>{
})
},
edit(id,isParent,parentId,name) {
this.id=id;
this.isParent=isParent;
this.parentId=parentId
this.addForm.name=name;
this.editCategoryByParentIdDialogVisible=true;
},
/**
* 根据id编辑节点
*/
submitEditCategoryById(){
editCategoryById({id:this.id,name:this.addForm.name,isParent:this.isParent,parentId:this.parentId}).then(res=>{
if (res.code===200){
this.$message({
type: ‘success‘,
message: ‘更新成功‘
});
this.addForm={}
this.editCategoryByParentIdDialogVisible=false
this.getlist();
}
if (res.code===801){
this.$message({
type: ‘error‘,
message: ‘更新失败‘
});
this.addForm={}
this.editCategoryByParentIdDialogVisible=false
this.getlist();
}
}).catch(res=>{
})
}
}
}
</script>
<style scoped>
.el-tree {
margin-top: 20px;
}
.custom-tree-node {
flex: 1;
display: flex;
align-items: center;
justify-content: space-between;
font-size: 14px;
padding-right: 8px;
}
</style>
后端代码：
实体类：
@Entity @Table(name = "tb_category") public class Category { @Id @Column(name = "id") @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; @Column(name = "name") private String name; @Column(name = "parent_id") private Integer parentId; @Column(name = "is_parent") private Integer isParent; @Column(name = "sort") private Integer sort; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getParentId() { return parentId; } public void setParentId(Integer parentId) { this.parentId = parentId; } public Integer getIsParent() { return isParent; } public void setIsParent(Integer isParent) { this.isParent = isParent; } public Integer getSort() { return sort; } public void setSort(Integer sort) { this.sort = sort; } }
controller:
@RestController @RequestMapping(value = "category") public class CategoryController { @Autowired private CategoryService categoryService; /** * 查询所有节点 * @return */ @RequestMapping(value = "/list", method = RequestMethod.GET) public Result findCategory() { List<Category> list = categoryService.findCategory(); if (CollectionUtils.isEmpty(list)) { return ResultUtil.error(404, "资源未找到到"); } return ResultUtil.success(list); } /** * 新增一级目录 * @param category * @return */ @RequestMapping(value = "/add", method = RequestMethod.POST) public Result addCategory(@RequestBody Category category) { Category category1 = categoryService.findCategory(category); if (!StringUtils.isEmpty(category1)) { return ResultUtil.error(601, "新增失败"); } categoryService.addCategory(category); return ResultUtil.success(); } /** * 根据id删除节点 * @param id * @return */ @RequestMapping(value = "{id}",method = RequestMethod.DELETE) public Result deleteCategory(@PathVariable("id") Integer id ){ Optional<Category> optional= categoryService.findCategoryById(id); if (!StringUtils.isEmpty(optional)){ categoryService.deleteCategory(id); return ResultUtil.success(); } return ResultUtil.error(701,"删除失败"); } /** * 根据父节点新增子节点 * @param category * @return */ @RequestMapping(value = "/addByParentId",method = RequestMethod.POST) public Result saveCategoryById(@RequestBody Category category){ categoryService.save(category); return ResultUtil.success(); } /** * 通过id更新节点 * @param id * @param category * @return */ @RequestMapping(value = "{id}",method = RequestMethod.PUT) public Result updateCategory(@PathVariable("id") Integer id,@RequestBody Category category ){ Optional<Category> optional = categoryService.findCategoryById(id); if (!StringUtils.isEmpty(optional)){ categoryService.updateCategory(category); return ResultUtil.success(); } return ResultUtil.error(801,"更新失败"); } }
service:
public interface CategoryService { List<Category> findCategory(); void addCategory(Category category); Category findCategory(Category category); void deleteCategory(Integer id); Optional<Category> findCategoryById(Integer id); void save( Category category); void updateCategory(Category category); }
serviceImpl:
@Service public class CategoryServiceImpl implements CategoryService { @Autowired private CategoryDao categoryDao; @Override public List<Category> findCategory() { return categoryDao.findAll(); } @Override public void addCategory(Category category) { category.setParentId(0); category.setIsParent(1); category.setName(category.getName()); category.setSort(1); categoryDao.save(category); } @Override public Category findCategory(Category category) { categoryDao.findByName(category.getName()); return categoryDao.findByName(category.getName()); } @Override public void deleteCategory(Integer id) { categoryDao.deleteById(id); } @Override public Optional<Category> findCategoryById(Integer id) { return categoryDao.findById(id); } @Override public void save( Category category) { category.setSort(1); categoryDao.save(category); } @Override public void updateCategory(Category category) { category.setSort(2); categoryDao.save(category); } }
dao:
import com.leyou.entity.Category; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.JpaSpecificationExecutor; import java.util.Optional; public interface CategoryDao extends JpaRepository<Category,Integer> , JpaSpecificationExecutor<Category> { Category findByName(String name); Optional<Category> findById(Integer id); }
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