关于element跨分页操作选择的案例分析

<template>
  <div>
    <el-table
      :data="tableData"
      tooltip-effect="dark"
      
      header-align="left"
      border
      ref="table"
      row-key="serviceDateId"
      @selection-change="handleSelectionChange"
      @row-dblclick="toDetail"
      @sort-change="sortChange"
    >
    <el-table-column type="selection" el-table-column width="50" fixed="left"></el-table-column>
    <el-table-column label="序号" width="80" fixed="left">
      <template slot-scope="{row,$index}">
        <span>{{$index + 1}}</span>
      </template>
    </el-table-column>
    <el-table-column label="服务日期" prop="serviceDate" sortable="custom" min-width="120" ></el-table-column>
    <el-table-column label="服务对象" prop="vsoName" min-width="120"></el-table-column>
    <el-table-column label="身份证号" prop="idCard" sortable="custom" min-width="200"></el-table-column>
    <el-table-column label="服务内容" prop="serviceContentName" min-width="200"></el-table-column>
    <el-table-column label="服务结果" prop="serviceResultName" min-width="100"></el-table-column>
    <el-table-column label="志愿者" prop="volunteerName" sortable="custom" min-width="120" show-overflow-tooltip></el-table-column>
    <el-table-column label="志愿者所属组织" prop="objName" min-width="200" show-overflow-tooltip></el-table-column>
    <el-table-column fixed="right" label="操作" width="150" header-align="center">
      <template slot-scope="{row,$index}">
        <span @click="handleEdit(row)" class="table-btn" v-has="{class: '编辑'}">编辑</span>
        <span @click="handleRemove($index, row)" class="table-btn"
          v-has="{class: '删除'}">删除</span>
      </template>
    </el-table-column>
  </el-table>
  <pagination
    v-show="total>0"
    :total="total"
    :page.sync="form.pageNum"
    :limit.sync="form.pageSize"
    @pagination="getData(form)"
  />
  </div>
</template>
<script>
export default {
  data(){
    return{
      ruleForm: {
        username: '',
        password:''
      },
      form: {
        pageNum: 1, // 分页页数
        pageSize: 10, // 分页数量
      },
      multipleSelection: [], //多选的行数据
      multipleSelectionAll:[],// 当前页选中的数据
      idKey: 'idCard',
    }
  },
  methods: {
   setSelectRow() {
      if (!this.multipleSelectionAll || this.multipleSelectionAll.length <= 0) {
        return;
      }
      // 标识当前行的唯一键的名称
      let idKey = this.idKey;
      let selectAllIds = [];
      let that = this;
      this.multipleSelectionAll.forEach(row=>{
        selectAllIds.push(row[idKey]);
      })
      this.$refs.table.clearSelection();
      for(var i = 0; i < this.tableData.length; i++) {  
        if (selectAllIds.indexOf(this.tableData[i][idKey]) >= 0) {
        // 设置选中，记住table组件需要使用ref="table"
          this.$refs.table.toggleRowSelection(this.tableData[i], true);
        }
      }
    },
      // 记忆选择核心方法
    changePageCoreRecordData () {
      // 标识当前行的唯一键的名称
      let idKey = this.idKey;
      let that = this;
      //如果总记忆中还没有选择的数据，那么就直接取当前页选中的数据，不需要后面一系列计算
      if (!this.multipleSelectionAll.length) {
        this.multipleSelectionAll = this.multipleSelection;
        return;
      }
      // 总选择里面的key集合
      let selectAllIds = [];
      this.multipleSelectionAll.forEach(row=>{
        selectAllIds.push(row[idKey]);
      })
      let selectIds = []
      // 获取当前页选中的id
      this.multipleSelection.forEach(row=>{
        selectIds.push(row[idKey]);
        // 如果总选择里面不包含当前页选中的数据，那么就加入到总选择集合里
        if (selectAllIds.indexOf(row[idKey]) < 0) {
          that.multipleSelectionAll.push(row);
        }
      })
      let noSelectIds = [];
      // 得到当前页没有选中的id
      this.tableData.forEach(row=>{
        if (selectIds.indexOf(row[idKey]) < 0) {
          noSelectIds.push(row[idKey]);
        }
      })
      noSelectIds.forEach(id=>{
        if (selectAllIds.indexOf(id) >= 0) {
          for(let i = 0; i< that.multipleSelectionAll.length; i ++) {
            if (that.multipleSelectionAll[i][idKey] == id) {
            // 如果总选择中有未被选中的，那么就删除这条
            that.multipleSelectionAll.splice(i, 1);
            break;
            }
          }
        }
      })
    },
    // 多选的行数据
    handleSelectionChange(val) {
      this.multipleSelection = val
        setTimeout(()=>{
      this.changePageCoreRecordData();
      }, 50)
    },
    // 获取表格数据
    getData(form) {
      let parmas = _.cloneDeep(form);
      parmas.liveArea = typeof(parmas.liveArea) === 'object'&#63;parmas.liveArea.join(''):parmas.liveArea;
      recordSearch(form).then(res => {
        if (res.rows) {
          this.tableData = res.rows;
          this.total = res.total;
          this.exportData = _.cloneDeep(form);
          setTimeout(()=>{
            this.setSelectRow();
          }, 50)
        }
        else {
          this.tableData = [];
          this.total = 0;
        }
      })
    }
  },
  mounted(){
    this.getData(this.form)
  }
}
</script>
<style lang="sass" scoped>
  
</style>