Vue2移动端（H5项目）项目基于vant实现select多选（支持全选、搜索、反选，最大选择数、回显等功能）

一、最终效果

二、参数配置

1、代码示例：

<t-multiple-select
    v-model="queryData.useUserIds"
    label="适用人员"
    placeholder="点击选择适用人员"
    :option="{label:'userName',value:'userId'}"
    :columns="sendUserList"
  />

2、配置参数（t-multiple-select Attributes）继承van-field的属性

参数	说明	类型	默认值
v-model	选中的option.value集合，页面展示是：option.label	Array	-
columns	下拉数据源	Array	-
option	下拉数据指向的label/value	Object	{ label: ‘label’, value: ‘value’ }
isSearch	是否显示搜索框	Boolean	false
isShowAll	是否显示全选	Boolean	true
max	最大可选	Number, String	0

3、events 事件

事件名	说明	返回值
confirm	点击完成按钮时触发	选中的value
cancel	点击取消按钮时触发	-
change	选项改变时触发	选中的value
clickItem	点击单条数据的时候触发，	选中的当前数据

三、源码

<template>
  <div class="t_select">
    <div class="van-hairline--bottom">
      <van-field
        v-model="resultLabel"
        v-bind="$attrs"
        readonly
        :is-link="$attrs.disabled === undefined"
        error-message-align="right"
        input-align="right"
        @click="showPopu($attrs.disabled)"
        class="t-cell"
      />
      <van-popup v-model="show" position="bottom">
        <div class="van-picker__toolbar">
          <button type="button" class="van-picker__cancel" @click="cancel">取消button>
          <div class="van-ellipsis van-picker__title">
            {{$attrs.label}}
            <span v-if="max">(最多选{{max}}个)span>
          div>
          <button type="button" class="van-picker__confirm" @click="onConfirm">确认button>
        div>
        <div class="checkbox-con" style="max-height:264px;overflow-y:auto">
          <van-field
            v-model="searchVal"
            placeholder="搜索"
            @input="search"
            v-if="isSearch"
            input-align="left"
          />
          <van-cell title="全选" v-if="!max&&isShowAll">
            <template #right-icon>
              <van-checkbox name="all" @click="toggleAll" shape="square" v-model="checkedAll" />
            template>
          van-cell>
          <van-cell title="不包含" v-if="noIncludeOption">
            <template #right-icon>
              <van-checkbox name="00" @click="unToggleAll" v-model="unCheckedAll" />
            template>
          van-cell>

          <van-checkbox-group
            :max="max"
            v-model="checkboxValue"
            @change="change"
            ref="checkboxGroup"
          >
            <van-cell-group>
              <van-cell
                v-for="(item, index) in columnsData"
                clickable
                :key="item[option.value]"
                :title="item[option.label]"
                @click="toggle(index,item)"
              >
                <template #right-icon>
                  <van-checkbox :name="item[option.value]" shape="square" ref="checkboxes" />
                template>
              van-cell>
            van-cell-group>
          van-checkbox-group>
        div>
      van-popup>
    div>
  div>
template>

<script>
export default {
  name: 'TMultipleSelect',
  model: {
    prop: 'selectValue'
  },
  props: {
    columns: {
      type: Array,
      default: function () {
        return []
      }
    },
    selectValue: {
      type: Array,
      default: function () {
        return []
      }
    },
    option: {
      type: Object,
      default: function () {
        return { label: 'label', value: 'value' }
      }
    },
    // 是否显示搜索框
    isSearch: {
      type: Boolean,
      default: false
    },
    // 是否显示全选
    isShowAll: {
      type: Boolean,
      default: true
    },
    max: { // 最大可选
      type: [Number, String],
      default: 0
    },
    noIncludeOption: { // 是否有不包含选项
      type: Boolean,
      default: false
    }
  },
  computed: {
    resultLabel: {
      get() {
        const columns = JSON.parse(JSON.stringify(this.columns))
        if (this.noIncludeOption) { // 开启不包含
          columns.unshift({ name: '不包含', code: '00' })
        }
        const res = columns.filter(item => {
          return this.resultValue.indexOf(item[this.option.value]) > -1
        })
        const resLabel = res.map(item => {
          return item[this.option.label]
        })
        return resLabel.join(',')
      },
      set() {

      }
    }
  },
  data() {
    return {
      show: false,
      searchVal: '',
      columnsData: this.columns,
      checkboxValue: this.selectValue,
      checkedAll: false,
      resultValue: this.selectValue,
      unCheckedAll: false
    }
  },
  methods: {
    search(val) {
      if (val) {
        this.columnsData = this.columnsData.filter(item => {
          return item[this.option.label].indexOf(val) > -1
        })
      } else {
        this.columnsData = JSON.parse(JSON.stringify(this.columns))
      }
    },
    getData(val) {
      const res = this.columnsData.filter(item => {
        return val.indexOf(item[this.option.value]) > -1
      })
      return res
    },
    onConfirm() {
      this.resultValue = this.checkboxValue
      this.show = !this.show
      this.$emit('confirm', this.resultValue, this.getData(this.resultValue))
    },
    change(val) {
      this.$emit('change', val, this.getData(val))
    },
    cancel() {
      this.show = !this.show
      this.$emit('cancel')
    },
    toggle(index, item) {
      this.unCheckedAll = false
      this.checkboxValue = this.checkboxValue.filter(item => item != '00')
      this.$emit('clickItem', item)
      this.$refs.checkboxes[index].toggle()
    },
    toggleAll(all) { // 全选
      this.unCheckedAll = false
      this.checkboxValue = this.checkboxValue.filter(item => item != '00')
      this.$refs.checkboxGroup.toggleAll(this.checkedAll)
    },
    unToggleAll() { // 不包含
      this.$refs.checkboxGroup.toggleAll(false)
      this.checkboxValue = ['00']
    },
    showPopu(disabled) {
      this.columnsData = JSON.parse(JSON.stringify(this.columns))
      this.checkboxValue = JSON.parse(JSON.stringify(this.selectValue))
      this.resultValue = JSON.parse(JSON.stringify(this.selectValue))
      if (disabled !== undefined && disabled !== false) {
        return false
      } else {
        this.show = !this.show
      }
    }
  },
  watch: {
    selectValue(newVal) {
      this.resultValue = newVal
    },
    resultValue(val) {
      this.searchVal = ''
      this.columnsData = JSON.parse(JSON.stringify(this.columns))
      this.$emit('input', val)
    },
    columnsData: {
      handler(val) {
        if (val.length && val.length === this.checkboxValue.length) {
          this.checkedAll = true
        } else {
          this.checkedAll = false
        }
      },
      immediate: true
    },
    checkboxValue: {
      handler(val) {
        if (val.length && val.length === this.columnsData.length) {
          this.checkedAll = true
        } else {
          if (val.includes('00')) { // 不包含
            this.unCheckedAll = true
          }
          this.checkedAll = false
        }
      },
      immediate: true
    }
  }
}
script>

<style lang="scss" scoped>
.t_select {
  padding: 0 16px;
  background: #fff;
  .t-cell.van-cell {
    padding: 10px 0;
  }
  .t-cell.van-cell--required::before {
    left: -8px;
  }
  .van-popup {
    border-radius: 20px 20px 0 0;
  }
}
style>

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