如图，当点击查询后清空输入框的值，但是上拉加载更多时失效，获取不到数据，这个要怎么做？

WXML代码：

<form bindsubmit="formSubmit">
  <view class="search-input-group">
    <view class="input-group">
      <input class="search-input" placeholder="出发地" value="{{startPoint}}" bindinput="onStartPointEvent" />
      <image class="thumbnail" src="../../images/return.png" />
      <input class="search-input" placeholder="终点" value="{{goal}}" bindinput="onGoalEvent" />
    </view>
    <button class="search-button" size="mini" formType="submit">查询</button>
  </view>
</form>

JS代码：

data: {
    hasmore: true,
    sumlistress:[],
    startPoint:'',
    goal: '',
    isQuerying: false,
  },
  /**
   * 获取起点输入信息
   */
  onStartPointEvent(event) {
    const that = this;
    const startPoint = event.detail.value
    console.log('起点', startPoint);
    that.setData({
      startPoint: startPoint
    })
  },
  /**
   * 获取终点输入信息
   */
  onGoalEvent(event) {
    const that = this;
    const goal = event.detail.value
    console.log('终点', goal);
    that.setData({
      goal: goal
    })
  },
    /**
   * 按条件查询数据
   */
  async formSubmit(start = 0) {
    const that = this;
    that.setData({
      isQuerying: true,
    })
    
    let promite = db.collection("wehicle").where({
      startPoint: that.data.startPoint,
      goal: that.data.goal,
    })
    if(start>0){
      promite = promite.skip(start)
    }
    let pro = await promite.limit(2).orderBy('create_time','desc').get()
    console.log(pro)
    if(pro){
      const sumlistress = pro.data;
      console.log(sumlistress);
      promite.count().then(res => {
        console.log(res)
        that.setData({
          result:res.total
          })
      })
      let hasmore = false
      let newsumlistress = [];
        if (start > 0) {
          newsumlistress = that.data.sumlistress.concat(sumlistress);
        } else {
          newsumlistress = sumlistress;
        }
        newsumlistress.forEach((wehicle, index) => {
           wehicle.create_time = wehicle.create_time.toString();
        })
        that.setData({
          sumlistress: newsumlistress,
          hasmore: hasmore,
          startPoint:'',
          goal: ''
        })
    }
},
 /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom() {
    let hasmore = true;
    if(this.data.wehicles.length == 0 && this.data.sumlistress.length == 0){
      hasmore = false
    }
    this.setData({
      hasmore:hasmore
    })
    if(!this.data.isQuerying) {
      this.lowdrelease(this.data.wehicles.length);  
    }else{
      this.formSubmit(this.data.sumlistress.length);
    }  
  },