What should I do if the Vue reference datepicker plug-in cannot monitor the value of the datepicker input box?

This article mainly introduces the solution to the problem that Vue cannot monitor the value of the datepicker input box when using the third-party datepicker plug-in. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

1. Background

The third-party datepicker plug-in is used in the Vue project. After selecting the date, Vue cannot detect the datepicker input box. Changes

 <label class="fl">日期：</label>
 <p class="input-wrapper fr">
  <input class="daterangepicker" ref="datepicker" v-model="dateRange"/>
  <a href="javascript:;" rel="external nofollow" ></a>
 </p>
export default {
  data() {
    return {
      dateRange: &#39;&#39;
    }
  },
  watch: {
    dateRange(newVal, oldVal) {
      console.log(newVal) // 选择日期后无法监听dateRange的改变
    }
  }
}

2. Analysis

Searching for information found that Vue is actually unable to monitor data changes caused by third-party plug-ins. So the above method doesn't work. However, Vue provides us with a method that can convert any data into data that can be monitored by Vue, which is: vm.$set.

3. Solution

Take the datepicker I use as an example (jquery-daterangepicker)

data() {
    return {
      date: '',
      beginDate: '',
      endDate: ''
    }
  },
mounted () {
  $('.daterangepicker').dateRangePicker({
    autoClose: true,
    format: 'YYYY-MM-DD'
  }).bind('datepicker-change', this.setDate) //插件自带方法，选择日期后触发回调
 },
methods: {
  setDate() {
    let datepicker = this.$refs.datepicker
    //这一步是关键，具体说明可以参见vue api手册
    this.$set(this.date, 'beginDate', datepicker.value)
    this.$set(this.date, 'endDate', datepicker.value)
    this.beginDate = this.date.beginDate.slice(0, 11)
    this.endDate = this.date.endDate.slice(-10)
  }  
 },
  watch: {
  // 这里就可以监听数据变化啦，可以愉快的选择日期了！
   beginDate(newVal, oldVal) {
     this.$emit( 'beginDateChange', newVal )
   },
   endDate(newVal, oldVal) {
     this.$emit( 'endDateChange', newVal )
   }
  }

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