如下效果：

可使用keyword 输入检索

el-combo-grid.vue  组件：

<template>
  <div >
    <el-input :value="value" @input="changeValue" @focus="onfocus" @blur="onblur" :placeholder="placeholder" ref="inputValue"></el-input>
    <div class="el-picker-panel" :style="pStyle" v-show="visible" ref="elcombogrid">
      <div class="table-container">
        <el-table v-loading="listLoading"  :data="list" @row-click="rowClick" stripe  size="mini" element-loading-text="Loading" fit border highlight-current-row>
          <el-table-column v-if="showIndex" label="序号"    type="index"  align="center" width="50"></el-table-column>
          <el-table-column v-for="item in columns"
                           :type="item.type"
                           :key="item.key"
                           :label="item.label"
                           :prop="item.key"
                           :align="item.align"
                           :width="item.width"
                           :header-align="item.headerAlign">
                      <template slot-scope="scope">
                        <span>{{ scope.row[item.key] }}</span>
                      </template>
          </el-table-column>
        </el-table>
        <cus-pagination v-show="pagination" :total="total" :page.sync="listQuery.page" :limit.sync="listQuery.limit" @pagination="getList"/>
      </div>
    </div>
  </div>
</template>
<script>
  import request from '@/utils/request';

  export default {
      name: "el-combo-grid",
      props:{
        placeholder:{type:String},
        value:{type:String},
        requestUrl:{type:String},
        columns:{type:Array},
        panelStyle:{type:String},
        itemValue:{type:String},
        showIndex:{type:Boolean},
        pagination:{type:Boolean},
        requestParam:{type:Object}
      },
      data(){
        return{
          visible:false,
          pStyle:'width:500px',
          list:[],
          total: 0,
          listLoading: true,
          listQuery: {
            page: 1,
            limit: 5,
            keyword:null
          },
          keyword:''
        }
      },
      methods:{
        changeValue(val){
          this.$emit('input',val)//向上级传送数据
          this.keyword = val
          this.getList()
        },
        onfocus(el){
          this.pStyle = this.panelStyle+';position:absolute;z-index:999999'
          this.visible = true
          this.keyword =  el.target.value
          this.getList()
        },
        onblur(el){
        },
        getList(){
          if(this.pagination){
            this.listQuery.keyword= this.keyword
          }else {
            if(this.keyword){
              this.listQuery ={
                keyword:this.keyword
              }
            }else {
              this.listLoading = false
              return //如果不分页，无keyword不查询数据（避免大数据量）
            }
          }
          if(this.requestParam){
            let param = this.requestParam;
            for (let p in param){
                this.listQuery[p] = param[p]
            }
          }
          this.listLoading = true;
          this.queryTableData(this.listQuery).then(response => {
            this.list = response.data.list;
            this.total = response.data.total;
            this.listLoading = false;
          })
        },
        queryTableData(query){
            return request({
              url: this.requestUrl,
              method: 'post',
              data: query
            });
        },
        rowClick:function(row, column, event){
          this.$emit('row-select-event',row, column, event)
          this.$emit('input',row[this.itemValue])
          this.visible = false
        }
      }
    }
</script>

使用例子

<el-combo-grid  v-model="form.studentName"
                :placeholder="'请选择交款学生'"
                :requestUrl="'/api/edu/student/listPage'"                 :requestParam="{}"                :pagination="true"
                :columns="students_columns"
                :show-index="true"
                :item-value="'name'"
                :panel-style="'width:550px'"
                @row-select-event="studentSelect"
>
</el-combo-grid>