基于Vue的ElementUI项目实现父子组件信息传递

Posted 2021-06-29 lovoo

前言

如项目中有一个产品分类的树形组件，在分类属性组件中引入之后，要实现点击左侧的树节点，更新右端的表格，这种功能如何实现呢？
如图：

1、子组件：

1.1、在el-tree节点上加上

 @node-click="nodeClick"

1.2、实现方法中使用this.$emit进行数据提交，

nodeClick(data, node, component){
      //向父组件发送数据请求
      console.log(data, node, component)
      this.$emit('tree-node-click', data, node, component)
    }

此方法有四个参数，第一个’tree-node-click’是在父组件中的方法属性，data表示节点的数所, node表示节点信息, component表示组件本身

1.3、全部源码

<template>
  <el-tree :data="menus" :props="defaultProps"  node-key="catId" ref="menuTree" @node-click="nodeClick"></el-tree>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具js，第三方插件js，json文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';

export default {
  //import引入的组件需要注入到对象中才能使用
  components: {},
  data() {
    return {
      menus: [],
      expandedKeys: [], // expandedKeys默认展开的数组
      defaultProps: {
        children: 'children',
        label: 'name'
      }
    };
  },
  //监听属性 类似于data概念
  computed: {},
  //监控data中的数据变化
  watch: {},
  //方法集合
  methods: {
    getMenus() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get'
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.menus = data.data;
        } else {
        }
        this.dataListLoading = false;
      });
    },
    nodeClick(data, node, component){
      //向父组件发送数据请求
      console.log(data, node, component)
      this.$emit('tree-node-click', data, node, component)
    }
  },
  //生命周期 - 创建完成（可以访问当前this实例）
  created() {
    this.getMenus();
  }, 
};
</script>

2、父组件

2.1、引入组件

import Category from '../../common/category.vue';

2.2、定义组件

components: {
    Category
  },

2.3、使用组件，并给组件添加子组件定义的方法属性@tree-node-click=“treeNodeClick”

<el-col :span="6"><category @tree-node-click="treeNodeClick"></category></el-col>

2.4、实现treeNodeClick方法

treeNodeClick(data, node, component){
      console.log("响应数据：", data, node, component)
    },

2.5、全部源码

<template>
  <el-row :gutter="20">
    <el-col :span="6"><category @tree-node-click="treeNodeClick"></category></el-col>
    <el-col :span="18">
      <div class="mod-config">
        <el-form :inline="true" :model="dataForm" @keyup.enter.native="getDataList()">
          <el-form-item><el-input v-model="dataForm.key" placeholder="参数名" clearable></el-input></el-form-item>
          <el-form-item>
            <el-button @click="getDataList()">查询</el-button>
            <el-button v-if="isAuth('product:attrgroup:save')" type="primary" @click="addOrUpdateHandle()">新增</el-button>
            <el-button v-if="isAuth('product:attrgroup:delete')" type="danger" @click="deleteHandle()" :disabled="dataListSelections.length <= 0">批量删除</el-button>
          </el-form-item>
        </el-form>
        <el-table :data="dataList" border v-loading="dataListLoading" @selection-change="selectionChangeHandle" style="width: 100%;">
          <el-table-column type="selection" header-align="center" align="center" width="50"></el-table-column>
          <el-table-column prop="attrGroupId" header-align="center" align="center" label="分组id"></el-table-column>
          <el-table-column prop="attrGroupName" header-align="center" align="center" label="组名"></el-table-column>
          <el-table-column prop="sort" header-align="center" align="center" label="排序"></el-table-column>
          <el-table-column prop="descript" header-align="center" align="center" label="描述"></el-table-column>
          <el-table-column prop="icon" header-align="center" align="center" label="组图标"></el-table-column>
          <el-table-column prop="catelogId" header-align="center" align="center" label="所属分类id"></el-table-column>
          <el-table-column fixed="right" header-align="center" align="center" width="150" label="操作">
            <template slot-scope="scope">
              <el-button type="text" size="small" @click="addOrUpdateHandle(scope.row.attrGroupId)">修改</el-button>
              <el-button type="text" size="small" @click="deleteHandle(scope.row.attrGroupId)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
        <el-pagination
          @size-change="sizeChangeHandle"
          @current-change="currentChangeHandle"
          :current-page="pageIndex"
          :page-sizes="[10, 20, 50, 100]"
          :page-size="pageSize"
          :total="totalPage"
          layout="total, sizes, prev, pager, next, jumper"
        ></el-pagination>
        <!-- 弹窗, 新增 / 修改 -->
        <add-or-update v-if="addOrUpdateVisible" ref="addOrUpdate" @refreshDataList="getDataList"></add-or-update>
      </div>
    </el-col>
  </el-row>
</template>

<script>

import Category from '../../common/category.vue';

export default {
  //import引入的组件需要注入到对象中才能使用
  components: {
    Category
  },
  data() {
    return {
      dataForm: {
        key: ''
      },
      dataList: [],
      pageIndex: 1,
      pageSize: 10,
      totalPage: 0,
      dataListLoading: false,
      dataListSelections: [],
      addOrUpdateVisible: false
    };
  },
  activated() {
    this.getDataList();
  },
  methods: {
    // 获取数据列表
    getDataList() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl('/product/attrgroup/list'),
        method: 'get',
        params: this.$http.adornParams({
          page: this.pageIndex,
          limit: this.pageSize,
          key: this.dataForm.key
        })
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.dataList = data.page.list;
          this.totalPage = data.page.totalCount;
        } else {
          this.dataList = [];
          this.totalPage = 0;
        }
        this.dataListLoading = false;
      });
    },
    //响应父节点事件 $emit('tree-node-click', data, node, component)
    treeNodeClick(data, node, component){
      console.log("响应数据：", data, node, component)
    },
   
};
</script>