详解vuejs2.0 select 动态绑定下拉框支持多选

select 下拉选择

产品类型：这一项是select 涉及到父子组件信息传递 下面拆开讲解

父组件

 <div class="sales-board-line">
    <div class="sales-board-line-left">
     产品类型：
    </div>
    <div class="sales-board-line-right">
     <v-selection :selections="buyTypes" @on-change="onParamChange('buyType', $event)"></v-selection>
    </div>
   </div>

<script>
import VSelection from '../../components/base/selection'
import _ from 'lodash'
export default {
 components: {
 VSelection,
 VCounter,
 VChooser,
 VMulChooser,
 MyDialog: Dialog,
 BankChooser,
 CheckOrder
 },
 data () {
 return {
  buyNum: 0,
  buyType: {},
  versions: [],
  period: {},
  price: 0,
  versionList: [
  {
   label: '客户版',
   value: 0
  },
  {
   label: '代理商版',
   value: 1
  },
  {
   label: '专家版',
   value: 2
  }
  ],
  periodList: [
  {
   label: '半年',
   value: 0
  },
  {
   label: '一年',
   value: 1
  },
  {
   label: '三年',
   value: 2
  }
  ],
  buyTypes: [
  {
   label: '入门版',
   value: 0
  },
  {
   label: '中级版',
   value: 1
  },
  {
   label: '高级版',
   value: 2
  }
  ],
  isShowPayDialog: false,
  bankId: null,
  orderId: null,
  isShowCheckOrder: false,
  isShowErrDialog: false
 }
 },
 methods: {
 onParamChange (attr, val) {
  this[attr] = val
  // this.getPrice()
  console.log(this[attr], attr)
 },
 getPrice () {
  let buyVersionsArray = _.map(this.versions, (item) => {
  return item.value
  })
  let reqParams = {
  buyNumber: this.buyNum,
  buyType: this.buyType.value,
  period: this.period.value,
  version: buyVersionsArray.join(',')
  }
  this.$http.post('/api/getPrice', reqParams)
  .then((res) => {
  this.price = res.data.amount
  })
 },

 onChangeBanks (bankObj) {
  this.bankId = bankObj.id
 },
 confirmBuy () {
  let buyVersionsArray = _.map(this.versions, (item) => {
  return item.value
  })
  let reqParams = {
  buyNumber: this.buyNum,
  buyType: this.buyType.value,
  period: this.period.value,
  version: buyVersionsArray.join(','),
  bankId: this.bankId
  }
  this.$http.post('/api/createOrder', reqParams)
  .then((res) => {
  this.orderId = res.data.orderId
  this.isShowCheckOrder = true
  this.isShowPayDialog = false
  }, (err) => {
  this.isShowBuyDialog = false
  this.isShowErrDialog = true
  })
 }
 },
 mounted () {
 this.buyNum = 1
 this.buyType = this.buyTypes[0]
 this.versions = [this.versionList[0]]
 this.period = this.periodList[0]
 }
}
</script>

:selections=”buyTypes” 传入子组件 在子组件 接收这个参数

@on-change=”onParamChange(‘buyType', $event)” 通过这个事件 接收 子组件传入 的参数

子组件

<template>
 <div class="selection-component">
  <div class="selection-show" @click="toggleDrop">
  <span>{{ selections[nowIndex].label }}</span>
  <div class="arrow"></div>
  </div>
  <div class="selection-list" v-if="isDrop">
  <ul>
   <li v-for="(item, index) in selections" @click="chooseSelection(index)">{{ item.label }}</li>
  </ul>
  </div>
 </div>
</template>

<script>
export default {
 props: {
 selections: {
  type: Array,
  default: [{
  label: 'test',
  value: 0
  }]
 }
 },
 data () {
 return {
  isDrop: false,
  nowIndex: 0
 }
 },
 methods: {
 toggleDrop () {
  this.isDrop = !this.isDrop
 },
 chooseSelection (index) {
  this.nowIndex = index
  this.isDrop = false
  this.$emit('on-change', this.selections[this.nowIndex])
 }
 }
}
</script>

<style scoped>
.selection-component {
 position: relative;
 display: inline-block;
}
.selection-show {
 border: 1px solid #e3e3e3;
 padding: 0 20px 0 10px;
 display: inline-block;
 position: relative;
 cursor: pointer;
 height: 25px;
 line-height: 25px;
 border-radius: 3px;
 background: #fff;
}
.selection-show .arrow {
 display: inline-block;
 border-left: 4px solid transparent;
 border-right: 4px solid transparent;
 border-top: 5px solid #e3e3e3;
 width: 0;
 height: 0;
 margin-top: -1px;
 margin-left: 6px;
 margin-right: -14px;
 vertical-align: middle;
}
.selection-list {
 display: inline-block;
 position: absolute;
 left: 0;
 top: 25px;
 width: 100%;
 background: #fff;
 border-top: 1px solid #e3e3e3;
 border-bottom: 1px solid #e3e3e3;
 z-index: 5;
}
.selection-list li {
 padding: 5px 15px 5px 10px;
 border-left: 1px solid #e3e3e3;
 border-right: 1px solid #e3e3e3;
 cursor: pointer;
 background: #fff;
 white-space: nowrap;
 overflow: hidden;
 text-overflow: ellipsis;

}
.selection-list li:hover {
 background: #e3e3e3;
}
</style>

select 多选

产品版本：这一项是select 涉及到父子组件信息传递 下面拆开讲解

父组件

<div class="sales-board-line">
    <div class="sales-board-line-left">
     产品版本：
    </div>
    <div class="sales-board-line-right">
     <v-mul-chooser
     :selections="versionList"
     @on-change="onParamChange('versions', $event)"></v-mul-chooser>
    </div>
   </div>

子组件

<template>
 <div class="chooser-component">
  <ul class="chooser-list">
   <li
   v-for="(item, index) in selections"
   @click="toggleSelection(index)"
   :title="item.label"
   :class="{active: checkActive(index)}"
   >{{ item.label }}</li>
  </ul>
  </div>
 </div>
</template>

<script>
import _ from 'lodash'
export default {
 props: {
 selections: {
  type: Array,
  default: [{
  label: 'test',
  value: 0
  }]
 }
 },
 data () {
 return {
  nowIndexes: [0]
 }
 },
 methods: {
 toggleSelection (index) {
  if (this.nowIndexes.indexOf(index) === -1) {
  this.nowIndexes.push(index) 
  }
  else {
  this.nowIndexes = _.remove(this.nowIndexes, (idx) => {
   return idx !== index
  })
  }
  let nowObjArray = _.map(this.nowIndexes, (idx) => {
  return this.selections[idx]
  })
  this.$emit('on-change', nowObjArray)
 },
 checkActive (index) {
  return this.nowIndexes.indexOf(index) !== -1
 }
 }
}
</script>

<style scoped>
.chooser-component {
 position: relative;
 display: inline-block;
}
.chooser-list li{
 display: inline-block;
 border: 1px solid #e3e3e3;
 height: 25px;
 line-height: 25px;
 padding: 0 8px;
 margin-right: 5px;
 border-radius: 3px;
 text-align: center;
 cursor: pointer;
}
.chooser-list li.active {
 border-color: #4fc08d;
 background: #4fc08d;
 color: #fff;
}
</style>

这里用到 lodash 因为vuejs2.0 放弃了$.remove 方法 可以通过lodash 方法解决

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