组件拆分实战

我们以之前做的后台文章管理模块为例，实现组件拆分、组件之间互相传值、方法调用、代码封装等功能。

准备工作

在 src/componments 里面新建 articles 文件夹，用于存放我们拆分出来的子组件。

拆分面包屑

1、在 src/componments/articles 里面新建 BreadComponent.vue 组件

<template>
  <div>
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">新闻管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>新闻列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-divider></el-divider>
  </div>
</template>

2、在 views/articles/ListView.vue 中

<template>
  <div>
    <!--面包屑-->
    <Bread />
    .
    .
  </div>
</template>
    
<script>
import Bread from "@/components/articles/BreadComponent";
.
.
export default {
    
  components: {
    
    Bread,
  },
  .
  .
}
</script>

拆分工具栏

1、在 src/componments/articles 里面新建 ToolsComponent.vue 组件

<template>
  <div class="controls">
    <!--通过 $parent 方法访问父组件的 showCreateForm 方法-->
    <el-button type="primary" @click="$parent.showCreateForm">新增</el-button>
    <!--通过 $parent 方法访问父组件的 handleMultipleDelete 方法-->
    <el-popconfirm
      title="确定要批量删除吗？"
      @confirm="$parent.handleMultipleDelete"
    >
      <el-button type="danger" slot="reference">批量删除</el-button>
    </el-popconfirm>
  </div>
</template>

2、在 views/articles/ListView.vue 中

<template>
  <div>
    .
    .
    <!--工具栏-->
    <Tools />
    .
    .
  </div>
</template>

<script>
.
.
import Tools from "@/components/articles/ToolsComponent";
.
.
export default {
    
  components: {
    
    .
    .
    Tools,
  },
  .
  .
  methods:{
    
    // 显示新增表单
    showCreateForm() {
    },
    // 批量删除
    handleMultipleDelete() {
    
      const length = this.multipleSelection.length;
      if (length == 0) {
    
        this.$message.error("你必须选择一条以上记录后，再做操作！");
        return;
      }

      const checkedId = this.multipleSelection.map((item) => {
    
        return item.id;
      });

      this.$confirm("此操作将删除到回收站, 是否继续?", "提示", {
    
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(async () => {
    
        const res = await multipleDeleteArticle({
     checkedId: checkedId });
        console.log(res);
      });
    },
  }
}
</script>

拆分搜索框

1、在 src/componments/articles 里面新建 SearchComponent.vue 组件

<template>
  <div>
    <!--通过 $parent 方法调用父组件的 searchData 属性和 init 方法-->
    <el-form
      :inline="true"
      :model="$parent.searchData"
      class="demo-form-inline"
    >
      <el-form-item label="标题">
        <el-input
          v-model="$parent.searchData.title"
          placeholder="请填写标题"
          clearable
          @clear="$parent.init"
        ></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onSearch">查询</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
    
  methods: {
    
    // 绑定点击查询按钮执行搜索
    onSearch() {
    
      // 通过 $emit 方法 访问父组件自定义的 handleSearch 事件
      this.$emit("handleSearch");
    },
  },
};
</script>

2、在 views/articles/ListView.vue 中

<template>
  <div>
    .
    .
    <!--搜索：绑定子组件需要的自定义事件-->
    <Search @handleSearch="init" />
    .
    .
  </div>
</template>

<script>
.
.
import Search from "@/components/articles/SearchComponent";
.
.
export default {
    
  components: {
    
    .
    .
    Search,
  },
  .
  .
}
</script>

拆分表格

1、在 src/componments/articles 里面新建 TableComponent.vue 组件

<template>
  <div>
    <el-card>
      <el-table
        v-loading="loading"
        ref="multipleTable"
        :data="articles"
        tooltip-effect="dark"
        style="width: 100%"
        @selection-change="handleSelectionChange"
      >
        <el-table-column type="selection" width="55"> </el-table-column>
        <el-table-column label="编号" prop="id"></el-table-column>
        <el-table-column prop="title" label="标题"></el-table-column>
        <el-table-column label="创建时间">
          <template slot-scope="scope">{
    {
    
            scope.row.createdAt | dateFormat
          }}</template>
        </el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button size="mini" @click="handleEdit(scope.row)"
              >编辑</el-button
            >
            <el-button
              size="mini"
              type="danger"
              @click="handleDelete(scope.$index, scope.row)"
              >删除</el-button
            >
          </template>
        </el-table-column>
      </el-table>

      <div class="block" style="margin-top: 20px">
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pagination.currentPage"
          :page-sizes="[10, 20, 30, 40]"
          :page-size="pagination.pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="pagination.total"
        >
        </el-pagination>
      </div>
    </el-card>
  </div>
</template>

2、在 views/articles/ListView.vue 中

.
.
<!--表格：通过属性 articles 把获取到的 tableData 的数据传给子组件，pagination亦同。通过 tef 给表格起个名字叫 myTable-->
<Table ref="myTable" :articles="tableData" :pagination="pagination" />
.
.

表格虽然拿过来了，但是我们要确认几个东西，这些变量或方法都是缺一不可的，如：

• articles
• handleSelectionChange
• handleSizeChange
• handleCurrentChange
• pagination.currentPage
• pagination.pageSize
• pagination.total

所以 js 部分代码如下：

<script>
export default {
    
  // 接收父组件传过来的属性
  props: ["articles", "pagination"],
  data() {
    
    return {
    
      multipleSelection: [],
    };
  },
  methods: {
    
    handleSelectionChange(val) {
    
      this.multipleSelection = val;
    },
    handleSizeChange(val) {
    
      this.searchData.pageSize = val;
      this.init();
    },
    handleCurrentChange(val) {
    
      this.searchData.currentPage = val;
      this.init();
    },
  },
};
</script>

最终 TableComponent.vue 代码，如下

<template>
  <div>
    <el-card>
      <el-table
        v-loading="$parent.loading"
        ref="multipleTable"
        :data="articles"
        tooltip-effect="dark"
        style="width: 100%"
        @selection-change="handleSelectionChange"
      >
        <el-table-column type="selection" width="55"> </el-table-column>
        <el-table-column label="编号" prop="id"></el-table-column>
        <el-table-column prop="title" label="标题"></el-table-column>
        <el-table-column label="创建时间">
          <template slot-scope="scope">{
    {
    
            scope.row.createdAt | dateFormat
          }}</template>
        </el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button size="mini" @click="handleEdit(scope.row)"
              >编辑</el-button
            >
            <el-button
              size="mini"
              type="danger"
              @click="handleDelete(scope.row)"
              >删除</el-button
            >
          </template>
        </el-table-column>
      </el-table>

      <div class="block" style="margin-top: 20px">
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pagination.currentPage"
          :page-sizes="[10, 20, 30, 40]"
          :page-size="pagination.pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="pagination.total"
        >
        </el-pagination>
      </div>
    </el-card>
  </div>
</template>

<script>
import {
     deleteArticle, multipleDeleteArticle } from "@/api/articles";

export default {
    
  props: ["articles", "pagination"],
  data() {
    
    return {
    
      multipleSelection: [],
    };
  },
  methods: {
    
    handleSizeChange(val) {
    
      this.$parent.pagination.pageSize = val;
      this.$parent.init();
    },
    handleCurrentChange(val) {
    
      this.$parent.pagination.currentPage = val;
      this.$parent.init();
    },
    // 删除单条
    async handleDelete(row) {
    
      const res = await deleteArticle(row.id);
      this.$message.success(res.message);
      this.$parent.init();
    },
    handleSelectionChange(val) {
    
      this.multipleSelection = val;
    },
    async multipleDelete() {
    
      const length = this.multipleSelection.length;
      if (length == 0) {
    
        this.$message.error("你必须选择一条以上记录后，再做操作！");
        return;
      }

      const checkedId = this.multipleSelection.map((item) => {
    
        return item.id;
      });

      this.$confirm("此操作将删除到回收站, 是否继续?", "提示", {
    
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(async () => {
    
        const res = await multipleDeleteArticle(checkedId);
        this.$message.success(res.message);
        this.$parent.init();
      });
    },
  },
};
</script>

首页增加如下方法

// 批量删除，调用子组件的方法
handleMultipleDelete() {
    
  this.$refs.myTable.multipleDelete();
},