vuejs2.0 select 动态绑定 下拉框 支持多选

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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

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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