mixins在表格分页数据展示中的应用

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当系统中存在很多带分页的表格数据展示时，可以使用混入（mixins）减少代码量。

在混入中设置表格的设置表格最小高度，并预先设置好分页。

mixins/windowResize.js:

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const mixin = {
  data() {
    const page = {
      index: 1,
      size: 20,
      total: 20,
      list: [20, 50, 100]
    };
    return {
      page
    };
  },
  mounted() {
    window.addEventListener('resize', this.onWindowResize);
    this.$nextTick(() => {
      this.onWindowResize();
    });
  },
  destroyed() {
    window.removeEventListener('resize', this.onWindowResize);
  },
  methods: {
    onWindowResize: function() {
      //获取表格距离顶部的距离
      let offsetTopValue = this.$el.querySelector('.tableInfoBox').getOffset().top;
      //获取窗口可视区域
      let innerHeight = window.innerHeight;
      //计算最小高度
      let minHeight = innerHeight - offsetTopValue - 20;
      minHeight = minHeight < 200 ? 200 : minHeight;
      //设置表格最小高度
      this.$el.querySelector('.tableInfoBox').style.minHeight = minHeight + 'px';
      this.$el.querySelector('.tableInfoBox .ivu-table-tip span').style.minHeight = minHeight - 50 + 'px';
    },
    go(index) {
      this.page.index = index;
      this.loadData(index);
    },
    size(size) {
      this.page.size = size;
      this.loadData();
    }
  }
};

export default mixin;

mixins/index.js:

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import WindowSize from './windowResize';

export { WindowSize};

example.vue:

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<template>
  <div class='tableInfoBox' :class="{hasDataAndPage:!!tableData.length}">
    <Table v-scoped
           border
           :columns="columnsData"
           :data="tableData"
           no-data-text="">
    </Table>
    <div class="webPage" style="border: 0;">
      <Page v-if="tableData && tableData.length !== 0"
            class="Pager"
            placement="top"
            :total="page.total"
            :page-size="page.size"
            :current="page.index"
            :page-size-opts="page.list"
            show-sizer
            show-elevator
            show-total
            @on-change="go"
            @on-page-size-change="size">
    	</Page>
    </div>
	</div>
</template>

<script>
	import { WindowSize} from '@/views/mixins';
  mixins: [WindowSize],
  data() {
    return {
      // data中不必再定义page
      columnsData: [],
      tableData: []
    }
  }，
  created(){
    this.loadData();	// 获取table数据方法必须为loadData
  }，
  methods:{
    loadData(pageIndex = 1) {
      if (pageIndex) this.page.index = pageIndex; //重置表格的页码
      let queryData = {
        page: this.page.index, //传递分页参数
        pageSize: this.page.size
      };
      Object.assign(queryData, this.searchData);
      this.$api['accurateTeaching/tableData'](queryData).then(data => {
        this.page.total = data.totalCount;
        this.tableData = data.dataList;
      });
    },
  }
</script>

@/utils/index.js:

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HTMLElement.prototype.getOffset = function(stopSelectorElement) {
  let offsetParent = this.offsetParent;
  let top = this.offsetTop,
    left = this.offsetLeft;
  while (offsetParent) {
    top += offsetParent.offsetTop;
    left += offsetParent.offsetLeft;
    offsetParent = offsetParent.offsetParent;
    if (stopSelectorElement && offsetParent === stopSelectorElement) {
      break;
    }
  }
  return {
    top: top,
    left: left,
    width: this.offsetWidth,
    height: this.offsetHeight
  };
};

@/index.js:

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import '@/utils';

注意点：

  1. 类名为tableInfoBox、hasDataAndPage、webPage。详见iView常见全局样式
  2. 获取table数据方法必须为loadData
  3. 上例中异步获取数据详见Vue封装axios