Vue2实现组件props双向绑定

Vue2的组件props通信方式

• 关于这一点的修改官方给的解释：

  prop 是单向绑定的：当父组件的属性变化时，将传导给子组件，但是不会反过来。这是为了防止子组件无意修改了父组件的状态——这会让应用的数据流难以理解。
  

  虽然废弃了props的双向绑定对于整个项目整体而言是有利且正确的，但是在某些时候我们确实需要从组件内部修改props的需求

联动组件代码：

<template>

  <div class="pick-bg" v-show="childselectArea" @click.self="cancelClick">
    <div class="pick-com">
      <div class="dp-header">
        <div class="dp-item dp-left vux-datetime-cancel" data-role="cancel" @click="cancelClick">取消div>
        
        <div class="dp-item dp-right vux-datetime-confirm" data-role="confirm" @click.stop="sureClick">确定div>
      div>
      <picker :data='addressList' :fixed-columns="columns"  :columns="3" v-model='selectAddList' @on-change='change' ref="picker">picker>
    div>
  div>
template>

<script>
import { Picker } from 'vux'
import { mapState } from 'vuex'
import gzw from '@/modules/gzw'
export default {
  components: {
    Picker
  },
  data() {
    return {
      selectAddList: [],
      resultObj: {},
      childselectArea: this.selectArea // ①创建props属性result的副本--myResult
    }
  },
  props: ['selectArea','columns'],
  created() {
    this.$store.dispatch('gzw/getAddressList')
  },
  computed: {
    ...mapState({
      addressList: state => state.gzw.addresList,
    })
  },
  watch: {
    selectArea(val) { // ②监听外部对props属性result的变更，并同步到组件内的data属性myResult中
      this.childselectArea = val
    },
    childselectArea(val) {
      this.$emit("on-result-change", {state: val, result: this.resultObj});//③组件内对myResult变更后向外部发送事件通知
    }
  },
  methods: {
    change(value) {
      // console.log('获取的value的值', value)
      // console.log(this.$refs.picker.getNameValues() + '获取的name')
    },
    cancelClick(event) {
      this.childselectArea = !this.childselectArea
    },
    sureClick() {
      this.resultObj = {'name': this.$refs.picker.getNameValues(), 'code': this.selectAddList}
      this.childselectArea = !this.childselectArea
    }
  }
}
script>

<style>
.pick-bg {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.4);
}

.pick-com {
  position: absolute;
  bottom: 0;
  width: 100%;
}

.dp-header {
  height: 40px;
  line-height: 40px;
  background-color: #fff;
}

.dp-item {
  width: 60px;
  text-align: center;
  color: #828282;
}

.dp-item:active {
  color: #298;
  background-color: '';
}

.dp-left {
  float: left;
}

.dp-right {
  float: right;
}
style>

外部调用：

class="map">
    地图导航

    "地区" :value="value" @click.native="selectAddressClick" is-link>
    "selectAreaAAAA"  @on-result-change="onResultChange">

  


methods: {
    selectAddressClick() { // 选择地区事件
      this.selectAreaAAAA = !this.selectAreaAAAA
    },
    onResultChange(val) {
      console.log('子组件改变之后通知父组件' + JSON.stringify(val))
      this.selectAreaAAAA = val.state
      this.value = val.result.name;
      console.log(val.result.code)
    }
  }