element中动态表单，如何把里程和里程费输完后自动带出数量赋值给里程费合计

Question

element中动态表单，如何把里程和里程费输完后自动带出数量赋值给里程费合计

Answer 1

给里程和里程费添加input事件，输入处理合计

示例：

<template>
  <div>
    <div
      class="item"
      v-for="(item, index) in list"
      :key="index">
      <div>
        <el-input v-model="item.mileage" placeholder="里程" @input="val => inputMileage(val, item, index)"></el-input>
      </div>
      <div>
        <el-input v-model="item.mileageFee" placeholder="里程费" @input="val => inputMileageFee(val, item, index)"></el-input>
      </div>
      <div>
        <el-input v-model="item.sum" placeholder="合计"></el-input>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      list: [
        { mileage: '', mileageFee: '', sum: '' },
        { mileage: '', mileageFee: '', sum: '' },
        { mileage: '', mileageFee: '', sum: '' },
        { mileage: '', mileageFee: '', sum: '' },
        { mileage: '', mileageFee: '', sum: '' },
        { mileage: '', mileageFee: '', sum: '' }
      ]
    }
  },
  methods: {
    inputMileage (val, item, index) {
      if (item.mileageFee) {
        item.sum = Number(val) * Number(item.mileageFee)
      }
    },
    inputMileageFee (val, item, index) {
      if (item.mileage) {
        item.sum = Number(val) * Number(item.mileage)
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.item {
  display: flex;
  align-items: center;
}
</style>