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vue3如何使用vant-picker封裝省市二級(jí)聯(lián)動(dòng)

更新時(shí)間：2022年10月13日 14:55:20 作者：腦子不太靈光的程序員

這篇文章主要介紹了vue3如何使用vant-picker封裝省市二級(jí)聯(lián)動(dòng)，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

怕什么真理無(wú)窮，進(jìn)一步有進(jìn)一步的歡喜呀，不得不承認(rèn)的就是，興趣和擅長(zhǎng)是一個(gè)良性迭代的循環(huán)啊，你擅長(zhǎng)某件事情，就會(huì)越喜歡它，越喜歡，就越愿意花時(shí)間，進(jìn)而越擅長(zhǎng)。所以代碼碼起來(lái)吧哈哈哈

近期用上了vue3，還順手寫(xiě)了個(gè)小需求，用vant-picker封裝一個(gè)省市的二級(jí)聯(lián)動(dòng)，并且在從后端接口獲取省市的數(shù)據(jù)，點(diǎn)開(kāi)彈出框需要展示默認(rèn)的選項(xiàng)，比如點(diǎn)擊廣東省-深圳市輸入框，彈出的picker級(jí)聯(lián)選擇器需要默認(rèn)廣東 -深圳。

如下圖：

在這里插入圖片描述

好，那么話不多說(shuō)，接下來(lái)一步一步來(lái)實(shí)現(xiàn)。

首先，項(xiàng)目中引入vant-ui

import { Popup, Picker } from 'vant'
components: {
    [Picker.name]: Picker,
    [Popup.name]: Popup,
  },

vant官網(wǎng)中，地區(qū)聯(lián)動(dòng)的形式是這樣的

在這里插入圖片描述

而我的數(shù)據(jù)格式是這樣的

[ {
    "citys": [
      {
        "cityName": "北京市"
      }
    ],
    "provinceName": "北京市"
  },
  {
    "citys": [
      {
        "cityName": "天津市"
      }
    ],
    "provinceName": "天津市"
  },
  {
    "citys": [
      {
        "cityName": "上海市"
      }
    ],
    "provinceName": "上海市"
  },
  {
    "citys": [
      {
        "cityName": "重慶市"
      }
    ],
    "provinceName": "重慶市"
  },]

然后對(duì)數(shù)據(jù)做了處理，處理成官網(wǎng)的形式，這樣就可以聯(lián)動(dòng)了

 const columnsData = chinaAreaDataType.map((item, index) => {
      const children: { text: string }[] = []
      item.citys.forEach((item) => {
        children.push({
          text: item.cityName,
        })
      })
      return { text: item.provinceName, children }
    })

其中關(guān)于一些vue3父子組件的傳值就不過(guò)多贅述了，有需要可自行查看官方文檔

接下來(lái)說(shuō)一說(shuō)，點(diǎn)開(kāi)彈出框需要展示默認(rèn)的選項(xiàng)怎么實(shí)現(xiàn)的吧，此處，vant官網(wǎng)給出了一個(gè)api，不過(guò)沒(méi)有使用示例，搗鼓了半天。

在這里插入圖片描述

使用setIndexes設(shè)置獲取到的索引值，就可以實(shí)現(xiàn)點(diǎn)開(kāi)彈出框需要展示默認(rèn)的選項(xiàng)了，在onMounted中通過(guò)ref去設(shè)置相應(yīng)的索引即可。

onMounted(() => {
      const cityName = toRef(props, 'areaValue').value.split('-')
      const findProvinceName = columnsData.findIndex((value) => value.text === cityName[0])
      const findCityName = columnsData[findProvinceName].children.findIndex((value) => value.text === cityName[1])
      areaPicker.value?.setIndexes([findProvinceName, findCityName])
    })

你以為這樣就結(jié)束了嗎，no no no,還要在popup 中設(shè)置lazy-render為false，這樣就結(jié)束拉~

好吧廢話不多說(shuō)，上子組件代碼

子組件代碼PickerArea

<template>
  <div class="container">
    <van-popup v-model:show="refShowOverlay" position="bottom" :lazy-render="false" round>
      <van-picker
        ref="areaPicker"
        show-toolbar
        :columns="columnsData"
        value-key="text"
        @change="handleChangeArea"
        @cancel="handleCancelArea"
        @confirm="handleConfirmArea"
      >
        <template v-slot:cancel>
          <div class="icon--button">
            <img src="@/assets/icons/lineCross.svg" />
          </div>
        </template>
        <template v-slot:title>
          <p class="title">{{ title }}</p>
        </template>
        <template v-slot:confirm>
          <div class="icon--button">
            <img src="@/assets/icons/lineHook.svg" />
          </div>
        </template>
      </van-picker>
    </van-popup>
  </div>
</template>
<script lang="ts">
import { defineComponent, ref, toRef, watch, reactive, onMounted } from 'vue'
import { Popup, Picker, Field } from 'vant'
import chinaAreaDataType from './chinaAreaData.json'
export default defineComponent({
  name: 'TasPickerArea',
  components: {
    [Picker.name]: Picker,
    [Popup.name]: Popup,
    [Field.name]: Field,
  },
  props: {
    areaValue: {
      type: String,
      default: '',
    },
    show: {
      type: Boolean,
      default: false,
    },
    showDatePicker: {
      type: Boolean,
      default: false,
    },
    title: {
      type: String,
      default: '請(qǐng)選擇地區(qū)',
    },
  },
  setup(props, { emit }) {
    const refShowOverlay = ref(false)
    const computedShowOverlay = toRef(props, 'showDatePicker')
    const areaPicker = ref<typeof Picker>()
    const handleCancelArea = () => {
      emit('close', false)
    }
    const columnsData = chinaAreaDataType.map((item, index) => {
      const children: { text: string }[] = []
      item.citys.forEach((item) => {
        children.push({
          text: item.cityName,
        })
      })
      return { text: item.provinceName, children }
    })
    const handleChangeArea = (area: Array<{ text: string }>) => {
      emit('change-area', area)
    }
    const handleConfirmArea = (area: Array<{ text: string }>) => {
      emit('confirm-area', area)
      handleCancelArea()
    }
    watch(computedShowOverlay, (nV) => {
      refShowOverlay.value = nV
    })
    onMounted(() => {
      const cityName = toRef(props, 'areaValue').value.split('-')
      const findProvinceName = columnsData.findIndex((value) => value.text === cityName[0])
      const findCityName = columnsData[findProvinceName].children.findIndex((value) => value.text === cityName[1])
      areaPicker.value?.setIndexes([findProvinceName, findCityName])
    })
    return {
      refShowOverlay,
      areaPicker,
      columnsData,
      handleChangeArea,
      handleCancelArea,
      handleConfirmArea,
    }
  },
})
</script>
<style lang="scss" scoped src="./index.scss" />

父組件代碼

<template>
  <div>
    <van-field v-model="areaValue" label="地區(qū)" placeholder="請(qǐng)輸入地區(qū)" @click="handleClickOFF" />
    <tas-picker-china-area
      :show-date-picker="show"
      @close="show = false"
      @confirm-area="handleConfirmArea"
      @change-area="handleChangeArea"
      :areaValue="areaValue"
    />
  </div>
</template>
<script lang="ts">
import { computed, defineComponent, ref, watch, reactive, toRefs } from 'vue'
import { Field } from 'vant'
import { px2remWithUnit } from '@/utils/ui'
import { getThemeVarValue } from '@/config/ui'
import { showDialog } from './components/TasDialog/dialog'
import TasPickerChinaArea from '@/components/TasPickerChinaArea/index.vue'
export default defineComponent({
  name: 'TasButton',
  components: {
    [Field.name]: Field,
    TasPickerChinaArea,
  },
  setup() {
    const show = ref(false)
    const refShowDatePicker = ref(true)
    const areaValue = ref('廣東省-深圳市')
    const handleClickOFF = () => {
      show.value = !show.value
    }
    const handleConfirmArea = (area: Array<{ text: string }>) => {
      areaValue.value = `${area[0].text} - ${area[1].text}`
    }
    const handleChangeArea = (area: Array<{ text: string }>) => {}
    return {
      show,
      areaValue,
      refShowDatePicker,
      handleClickOFF,
      handleConfirmArea,
      handleChangeArea,
    }
  },
})
</script>

css代碼

.container {
  overflow: hidden;
  &::v-deep(.van-picker-column) {
    font-size: 32px;
  }
  ::v-deep(.van-picker__toolbar) {
    height: auto;
    padding: 30px 45px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  }
}
.icon--button img {
  width: 52px;
}
.title {
  font-size: 32px;
  font-weight: 500;
  color: #000000;
  line-height: 45px;
}

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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