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Vue?elementUI實(shí)現(xiàn)樹形結(jié)構(gòu)表格與懶加載

更新時(shí)間：2022年01月04日 09:49:59 作者：別團(tuán)等shy哥發(fā)育

這篇文章主要介紹了通過Vue和elementUI實(shí)現(xiàn)樹形結(jié)構(gòu)表格與懶加載，文中的示例代碼講解詳細(xì)，感興趣的小伙伴快來跟隨小編一起學(xué)習(xí)一下吧

1、實(shí)現(xiàn)效果

2、后端實(shí)現(xiàn)

2.1 實(shí)體類

@Data
@ApiModel(description = "數(shù)據(jù)字典")
@TableName("dict")
public class Dict {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "id")
    private Long id;

    @ApiModelProperty(value = "創(chuàng)建時(shí)間")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @TableField("create_time")
    private Date createTime;

    @ApiModelProperty(value = "更新時(shí)間")
    @TableField("update_time")
    private Date updateTime;

    @ApiModelProperty(value = "邏輯刪除(1:已刪除，0:未刪除)")
    @TableLogic
    @TableField("is_deleted")
    private Integer isDeleted;

    @ApiModelProperty(value = "其他參數(shù)")
    @TableField(exist = false)
    private Map<String,Object> param = new HashMap<>();

    @ApiModelProperty(value = "上級id")
    @TableField("parent_id")
    private Long parentId;

    @ApiModelProperty(value = "名稱")
    @TableField("name")
    private String name;

    @ApiModelProperty(value = "值")
    @TableField("value")
    private String value;

    @ApiModelProperty(value = "編碼")
    @TableField("dict_code")
    private String dictCode;

    @ApiModelProperty(value = "是否包含子節(jié)點(diǎn)")
    @TableField(exist = false)
    private boolean hasChildren;

}

上面必須包含一個(gè)hasChildren屬性，即使數(shù)據(jù)庫中沒有該屬性，這是element框架要求的。

2.2 數(shù)據(jù)庫中的數(shù)據(jù)結(jié)構(gòu)

2.3 后端接口

如果完全用后端實(shí)現(xiàn)的話，那寫個(gè)遞歸把所有數(shù)據(jù)按照層次結(jié)構(gòu)查詢完并封裝好即可。但element的table組件給我們封裝好了一些東西，我們只需要在這里根據(jù)上級id查詢子數(shù)據(jù)列表即可。

controller代碼：

 //根據(jù)上級id查詢子數(shù)據(jù)列表
    @ApiOperation(value = "根據(jù)上級id查詢子數(shù)據(jù)列表")
    @GetMapping("findChildData/{id}")
    public Result findChildData(@PathVariable Long id){
        List<Dict> list = dictService.findChildData(id);
        return Result.ok(list);
    }

service

service實(shí)現(xiàn)類

@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {

    //根據(jù)上級id查詢子數(shù)據(jù)列表
    @Override
    public List<Dict> findChildData(Long id) {
        QueryWrapper<Dict> wrapper=new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        List<Dict> list = baseMapper.selectList(wrapper);
        //向list集合中的每個(gè)dict對象中設(shè)置hasChildren
        list.forEach(x->{
            Long dictId = x.getId();
            boolean isChild = this.isChildren(dictId);
            x.setHasChildren(isChild);
        });
        return list;
    }

    //判斷id下面是否有子數(shù)據(jù)
    private boolean isChildren(Long id){
        QueryWrapper<Dict> wrapper=new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(wrapper);
        return count > 0;
    }
}

2.4 swagger測試后端結(jié)構(gòu)功能是否正常

3、前端實(shí)現(xiàn)

3.1 頁面中引入el-table組件

list.vue

<template>
  <div class="app-container">

    <el-table
      :data="list"
      style="width: 100%"
      row-key="id"
      border
      lazy
      :load="getChildrens"
      :tree-props="{children: 'children', hasChildren: 'hasChildren'}">
      <el-table-column label="名稱" width="230" align="left">
        <template slot-scope="scope">
          <span>{{ scope.row.name }}</span>
        </template>
      </el-table-column>

      <el-table-column label="編碼" width="220">
        <template slot-scope="{row}">
          {{ row.dictCode }}
        </template>
      </el-table-column>
      <el-table-column label="值" width="230" align="left">
        <template slot-scope="scope">
          <span>{{ scope.row.value }}</span>
        </template>
      </el-table-column>
      <el-table-column label="創(chuàng)建時(shí)間" align="center">
        <template slot-scope="scope">
          <span>{{ scope.row.createTime }}</span>
        </template>
      </el-table-column>
    </el-table>
  </div>

</template>

<script>
import dict from '@/api/dict'
export default {
  name: 'list',
  data(){
    return{
      list:[], //數(shù)據(jù)字典列表數(shù)組
      dialogImportVisible:false,  //設(shè)置彈框是否彈出
    }
  },
  created() {
    this.getDictList(1)
  },
  methods:{
    //數(shù)據(jù)字典列表
    getDictList(id){
      dict.dictList(id)
        .then(response=>{
            this.list=response.data
        })
    },
    getChildrens(tree, treeNode, resolve) {
      dict.dictList(tree.id).then(response => {
        resolve(response.data)
      })
    },
  }
}
</script>

<style scoped>

</style>

上面關(guān)鍵的方法是getChildrens這個(gè)方法，在每一層調(diào)用后端接口將子節(jié)點(diǎn)數(shù)據(jù)查詢出來，并加入樹形結(jié)構(gòu)的表格數(shù)據(jù)中。

調(diào)用后端結(jié)構(gòu)的工具js文件 dict.js

import request from '@/utils/request'

export default {
  //數(shù)據(jù)字典列表
  dictList(id){
    return request({
      url: `/admin/cmn/dict/findChildData/${id}`,
      method: 'get'
    })
  },
}