vue elementUi tree lazy loaded using details

November 21, 2018 11:17:04 happy big cousin Reads: 3513

https://blog.csdn.net/a419419/article/details/84315751

background:

Under vue use elementUI

Documents:

http://element-cn.eleme.io/#/zh-CN/component/tree#tree-shu-xing-kong-jian

demand:

Saves only two nodes selected data; a selected node data is not saved.

effect:

Here Insert Picture Description

Data Sources:

Background two interfaces are provided for data taking a first stage and a second stage node of the node;

Ideas:

Tag list is clicked, the trigger selectLabelList first level node data acquisition trigger lodeNode filled, expand a node; click on any node of the down arrow eleven filled == 1 node.level loadNode acquired by the two nodes. Each selection will trigger handleCheckChange get selected or deselected delete content; save all secondary data will eventually be selected by the user to labelCheckedList this array.

important point:

 node-key、ref、lazy这3个属性一定要有
 一级节点传递给二级节点的值是用node.data里面的id即node.data.id而不是用官网案例上的node.id(被坑过)

Combat:

html:

<el-button  @click="selectLabelList">标签列表</el-button>
<el-tree
    node-key="id"
    ref="tree"
    highlight-current
    :props="props"
    :load="loadNode"
    lazy=""
    show-checkbox
    @check-change="handleCheckChange">
</el-tree>

js: This is the core part of the code, not all, and some fields have not been defined.

data() {
    return {
      labelCheckedList:[],
      props: {
          label: 'name',
          children: 'zones',
        }}
// labelCheckedList接收被勾选的数据
handleCheckChange(data){
      this.currTreeId=data.id
        setTimeout(() => {
          let currtData = this.$refs.tree.getCheckedNodes(true)
          this.labelCheckedList = currtData;
        }, 100);
    },
//懒加载时触发
loadNode(node, resolve) {
      if (node.level === 0) {
        return resolve(this.categorylist);
      }
      if (node.level > 1) return resolve([]);
      if(node.level === 1) { // 二级节点
        this.getChildrenNode(node,resolve)
      }
    },
// 二级节点
getChildrenNode(node,resolve) {
      let categoryId = node.data.id;
      this.$http.post('/api/getLabelListByCategoryId', {
          categoryId:categoryId
        },
        {
            emulateJSON: true,
            emulateHTTP: true
        }).then(res => {
          this.childrenList = res.body;
          if(this.childrenList.length==0){
            this.$message.error('数据拉取失败，请刷新再试！');
            return;
          }
          resolve(this.childrenList);
        });
    },
// 收起、展示tree
selectLabelList() {
      if(!this.isShowTree){
          this.getCategorylist();
      }else{
        this.$refs.tree.$data.store.lazy = false
        this.isShowTree=false;
      }

    },
//获取一级节点
getCategorylist(){
      this.$http.post('/api/categorylist', {
            searchInfo: this.searchLabelInfo,
          }).then(res => {
            let data = res.body.data.list;
            if(data.length > 0){
              data.forEach(item => {
                item.disabled= true;
              })
            }
            this.categorylist = data;
            this.isShowTree=true;
          })
    },