javascript - The selector in vue+element UI always displays the initial value and does not display the placeholder value

Question

Use vue with element UI as the query area. Due to two-way data binding, select always displays the initialized value directly during initialization without displaying the value in the placeholder, as shown in the figure:

But the background default is to query all without parameters. If you change all the values ​​​​to other values, the data will not be queried, which is embarrassing! !
Please ask God to solve it!

<p class="search-area m-t-md">
          <p class="header clearfix">
            <h3 class="text">仓库管理</h3>
            <span class="btn-text" @click="modalShow = true"><i class="icon-plus"></i>添加仓库</span>
          </p>
          <p class="inner">
            <el-input v-model="searchInfo.houseCode"  placeholder="请输入仓库编码或名称"></el-input>
            <el-select v-model="searchInfo.houseType"  placeholder="请选择仓库类型">
              <el-option value="" label="全部"></el-option>
              <el-option value="1" label="总店"></el-option>
              <el-option value="2" label="门店"></el-option>
            </el-select>
            <el-select v-model="searchInfo.storeNo"  placeholder="请选择所属门店">
              <el-option value="" label="全部"></el-option>
              <el-option v-for="store in storeLists" :key="store.storeNo" :value="store.storeNo" :label="store.storeName"></el-option>
            </el-select>
            <el-button type="primary" @click="getDepotLists">查询</el-button>
          </p>
        </p>
        
        <script type="text/ecmascript-6">
  import {mapState} from 'vuex'
    export default {
        name: 'depot',
        data () {
            return {
               
                searchInfo:{
                  method:'cn.linkea.mshop.houseFacade.findPageList',
                  chainCode:'',
                  createOperator:'',
                  houseCode:'',
                  houseName:'',
                  houseType:'',
                  pageIndex:'1',
                  pageSize:'10',
                  storeManager:'',
                  storeName:'',
                  storeNo:'',
                  updateOperator:''
                }
                
            }
        }
        

    }
</script>

Answer 1

You can do this

<el-option value="all_list" label="all"></el-option>

<script>

if ( this.searchInfo.houseType === 'all_list' ) {
    this.searchInfo.houseType='';
}

</script>

Personal opinion, for reference

Answer 2

The first method
searchInfo.houseTypeInitial value setting null
The second method
<el-option value="-1" label="All"></el-option>or <el-option value="-1" label="All"></el-option>
When sending a request, manually omit the value of -1 or 0!