element-ui封装一个Table模板组件的示例

大家在做后台管理系统的时候，写的最多的可能就是表格页面了，一般分三部分：搜索功能区、表格内容区和分页器区。一般这些功能都是使用第三方组件库实现，比如说element-ui，或者vuetify。这两个组件库都各有各的优点，但就table组件来说，我还是比较喜欢vuetify的实现，不用手写一个个column，只要传入headers的配置数组就行，甚至分页器都内置在了table组件里，用起来十分方便。有兴趣可以看看：vuetify data table。

上面是一个经典的用element-ui开发的table页面，而且实际工作中如果每个table页面都写一遍，重复代码太多了，所以不妨写一个table模板组件，减少重复代码。我的思路是这样的：

搜索功能区：

提供searchBar插槽，可以自定义搜索输入框，搜索、重置按钮必有，新增按钮通过props控制显隐。这里对应的代码如下：

genSearchBar() {
  if (this.noSearchBar || !this.$scopedSlots.searchBar) return '';
  return (
    <el-form class="seatch-form" inline={true} label-width="100">
      {this.$scopedSlots.searchBar()}
      <el-button
        class="filter-item"
        icon="el-icon-search"
        type="primary"
        onClick={this.handleSearchBtnClick}
      >
        查询
      </el-button>
      <el-button
        class="filter-item"
        icon="el-icon-refresh"
        onClick={this.handleResetBtnClick}
      >
        重置
      </el-button>
      <el-button
        class="filter-item"
        icon="el-icon-plus"
        type="primary"
        v-show={this.showAddBtn}
        onClick={this.handleAddBtnClick}
      >
        新增
      </el-button>
    </el-form>
  );
}

表格内容区：

通过传入headers自动生成columns，参数如下：

{
  label: '性别',
  prop: 'sex',
  width: '180',
  filter: 'sexFilter'
}

可对应如下代码：

<el-table-column
         prop="sex"
         label="性别"
         width="180">
  <template slot-scope="scope">{{scope.row.sex | sexFilter}}</template>
</el-table-column>

注意，只支持全局filter。

如果你想自定义column，也提供tableColumn插槽，支持自定义column，可以如下配置：

{
  prop: 'action'
}

<el-table-column
         prop="action"
         label="操作"
         width="180">
  <template slot-scope="scope">
    <el-button>编辑</el-button>
    <el-button>删除</el-button>
  </template>
</el-table-column>

这样，就会按传入的prop匹配对应的column，十分方便。

实现代码如下：

genTableSlot(h) {
  let customeColumns = this.$scopedSlots.tableColumn
    ? this.$scopedSlots.tableColumn()
    : [];
  return this.headers.map((item) => {
    // 根据item.prop判断是否使用传入的插槽内容
    let foundItem = customeColumns.find(
      (ele) =>
        ele.componentOptions &&
        ele.componentOptions.propsData.prop === item.prop
    );
    return foundItem
      ? foundItem
      : h('el-table-column', {
         props: {
           ...item,
         },
         scopedSlots: {
           default: (props) => {
             // 根据传入的全局filter处理column数据
             let filter = this.$options.filters[
               item.filter
             ];
             let itemValue = props.row[item.prop];
             return h(
               'span',
               filter ? filter(itemValue) : itemValue
             );
           },
         },
       });
  });
}

genTable(h) {
  return h(
    'el-table',
    {
      ref: 'tableRef',
      props: {
        ...this.$attrs,
        data: this.data,
      },
      on: {
        'selection-change': (val) => {
          this.$emit('selection-change', val);
        },
      },
    },
    [...this.genTableSlot(h)]
  );
}

分页器区：

如无特殊需求，分页器功能一致，所以直接内置。

实现代码如下：

genPagination() {
  return (
    <div class="pagination-wrap">
      <el-pagination
        layout="total,prev,pager,next,jumper"
        current-page={this.current}
        page-size={this.pageSize}
        total={this.total}
        {...{
          on: { 'current-change': this.handleCurrentChange },
        }}
      ></el-pagination>
    </div>
  );
}

最后附完整代码和demo：

<script>
export default {
  name: 'TableTemplate',
  props: {
    data: {
      type: Array,
      default: () => [],
      required: true,
    },
    headers: {
      type: Array,
      default: () => [],
      required: true,
    },
    current: {
      type: Number,
      default: 1,
    },
    pageSize: {
      type: Number,
      default: 10,
    },
    total: {
      type: Number,
      default: 0,
    },
    noSearchBar: Boolean,
    showAddBtn: Boolean,
  },
  mounted() {
    this.$nextTick(() => {
      this.$emit('search');
    });
  },
  methods: {
    genSearchBar() {
      if (this.noSearchBar || !this.$scopedSlots.searchBar) return '';
      return (
        <el-form class="seatch-form" inline={true} label-width="100">
          {this.$scopedSlots.searchBar()}
          <el-button
            class="filter-item"
            icon="el-icon-search"
            type="primary"
            onClick={this.handleSearchBtnClick}
          >
            查询
          </el-button>
          <el-button
            class="filter-item"
            icon="el-icon-refresh"
            onClick={this.handleResetBtnClick}
          >
            重置
          </el-button>
          <el-button
            class="filter-item"
            icon="el-icon-plus"
            type="primary"
            v-show={this.showAddBtn}
            onClick={this.handleAddBtnClick}
          >
            新增
          </el-button>
        </el-form>
      );
    },
    genTableSlot(h) {
      let customeColumns = this.$scopedSlots.tableColumn
        ? this.$scopedSlots.tableColumn()
        : [];
      return this.headers.map((item) => {
        // 根据item.prop判断是否使用传入的插槽内容
        let foundItem = customeColumns.find(
          (ele) =>
            ele.componentOptions &&
            ele.componentOptions.propsData.prop === item.prop
        );
        return foundItem
          ? foundItem
          : h('el-table-column', {
             props: {
               ...item,
             },
             scopedSlots: {
               default: (props) => {
                 let filter = this.$options.filters[
                   item.filter
                 ];
                 let itemValue = props.row[item.prop];
                 return h(
                   'span',
                   filter ? filter(itemValue) : itemValue
                 );
               },
             },
           });
      });
    },
    genTable(h) {
      return h(
        'el-table',
        {
          ref: 'tableRef',
          props: {
            ...this.$attrs,
            data: this.data,
          },
          on: {
            'selection-change': (val) => {
              this.$emit('selection-change', val);
            },
          },
        },
        [...this.genTableSlot(h)]
      );
    },
    genPagination() {
      return (
        <div class="pagination-wrap">
          <el-pagination
            layout="total,prev,pager,next,jumper"
            current-page={this.current}
            page-size={this.pageSize}
            total={this.total}
            {...{
              on: { 'current-change': this.handleCurrentChange },
            }}
          ></el-pagination>
        </div>
      );
    },
    resetPagination() {
      this.$emit('update:current', 1);
    },
    handleCurrentChange(val) {
      this.$emit('update:current', val);
      this.$emit('search');
    },
    handleSearchBtnClick() {
      this.$emit('search');
    },
    handleResetBtnClick() {
      this.resetPagination();
      this.$emit('reset');
    },
    handleAddBtnClick() {
      this.$emit('add');
    },
    getTableRef() {
      return this.$refs.tableRef;
    },
  },
  render(h) {
    return (
      <div>
        {this.genSearchBar()}
        {this.genTable(h)}
        {this.genPagination()}
      </div>
    );
  },
};
</script>

<style scoped>
.seatch-form {
  text-align: left;
}
.pagination-wrap {
  margin-top: 20px;
  text-align: right;
}
</style>

Demo:

<template>
  <div>
    <table-template
      border
      :headers="headers"
      :data="tableData"
      :current.sync="current"
      :total="total"
      ref="tableTemplate"
      showAddBtn
      @search="handleSearch"
      @reset="handleReset"
      @add="handleAdd"
      @selection-change="handleSelectionChange"
    >
      <template #searchBar>
        <el-form-item label="姓名：" prop="title">
          <el-input class="filter-item" v-model="searchForm.title" ></el-input>
        </el-form-item>
      </template>
      <template #tableColumn>
        <el-table-column
          prop="selection"
          type="selection"
          width="55"
        ></el-table-column>
        <el-table-column prop="test" label="姓名" width="180">
          <template slot-scope="scope">
            <el-popover trigger="hover" placement="top">
              <p>姓名：{{ scope.row.name }}</p>
              <p>住址：{{ scope.row.address }}</p>
              <div slot="reference" class="name-wrapper">
                <el-tag size="medium">{{scope.row.name}}</el-tag>
              </div>
            </el-popover>
          </template>
        </el-table-column>
      </template>
    </table-template>
  </div>
</template>

<script>
import TableTemplate from './TableTemplate';
export default {
  name: 'Demo',
  components: {
    TableTemplate,
  },
  data() {
    return {
      current: 1,
      total: 100,
      headers: [
        {
          prop: 'selection',
        },
        {
          label: '姓名',
          prop: 'name',
          width: '100',
        },
        {
          label: '年龄',
          prop: 'year',
        },
        {
          label: '性别',
          prop: 'sex',
          width: 'sexFilter',
        },
        {
          prop: 'test',
        },
      ],
      tableData: [
        {
          name: 'curry',
          year: 18,
          sex: 'female',
          address: '天安门',
        },
      ],
      searchForm: {
        title: '',
      },
    };
  },
  methods: {
    handleSearch() {
      console.log(this.current);
    },
    handleReset() {
      this.searchForm = {
        title: '',
      };
    },
    handleAdd() {
      console.log('添加');
    },
    handleSelectionChange(val) {
      console.log(val);
    },
    getTableRef() {
      console.log(this.$refs.tableTemplate.getTableRef());
    },
  },
};
</script>

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