vue elementui 动态追加下拉框、输入框功能

<template>
  <div>
    <el-dialog
      append-to-body
      :close-on-click-modal="false"
      :close-on-press-escape="false"
      width="65%"
      @close="onClose"
      :modal-append-to-body="true"
      title="新建"
      custom-class="dialogBox"
      :visible.sync="dialogVisible"
      :lock-scroll="true"
      :destroy-on-close="true">
      <el-form :model="combinationInfo" label-width="90px" ref="combinationForm" :rules="rules" :inline="true" size="small">
        <el-row>
          <el-col :span="12">
            <el-form-item prop="benchMarks" label="名称">
              <div style="color: #fb6b3f;width: 230px;">比例之和需为100%(当前
                <span>{{benchmarkTotal}}</span>
                <span></span>%)
              </div>
              <div v-for="(item,index) in combinationInfo.benchMarks" :key="index">
                <el-select
                  style="margin-bottom: 10px;"
                  clearable
                  filterable
                  collapse-tags
                  placeholder="请选择"
                  class="benchmarkSelectWidth"
                  @change="changeBenchmark"
                  v-model="item.code"
                >
                  <el-option
                    v-for="(item1, idx) in list"
                    :key="idx"
                    :label="item1.name"
                    :value="item1.code"
                  >
                  </el-option>
                </el-select>
                <el-input v-model="item.percentage" @input="changePercentage" placeholder="请输入" class="benchmarkInputWidth"></el-input>
                <span style="padding-left: 2px;">%</span>
                <i v-if="index !== 0" style="font-size: 18px;cursor: pointer;padding: 0 0 0 10px;color: #F56C6C;" @click="deleteIndex(index)" class="el-icon-remove-outline"></i>
              </div>
              <div v-if="benchmarkRule" style="color: #F56C6C;font-size: 12px;margin-top: -17px">请选择名称</div>
              <el-button @click="addIndex" size="mini" type="primary" icon="el-icon-plus">添加</el-button>
            </el-form-item>
          </el-col>
          <el-col :span="12">
          </el-col>
        </el-row>
      </el-form>
      <div style="text-align: right;margin-top: 20px;">
        <el-button size="mini" @click="onClose()">取 消</el-button>
        <el-button
          size="mini"
          type="primary"
          @click="onConfirm()"
          >提 交</el-button
        >
      </div>
    </el-dialog>
  </div>
</template>

data() {
    return {
      dialogVisible: false,
      combinationInfo: {
        benchMarks: [
          {
            code: '',
            name: '',
            percentage: '',
          }
        ]
      },
      rules: {
        benchMarks: [{ required: true }],
      },
      benchmarkRule: false,
      benchmarkTotal: 0,
      list: [
        {
          name: 'aaa',
          code: '111',
        },
        {
          name: 'bbb',
          code: '222',
        },
        {
          name: 'ccc',
          code: '333',
        },
      ],
    }
  },
methods: {
 // 添加
    addIndex () {
      this.combinationInfo.benchMarks.push({
        code: '',
        percentage: '',
      })
    },
    // 删除
    deleteIndex (index) {
      this.combinationInfo.benchMarks.splice(index,1)
      this.changePercentage()
    },
    changeBenchmark (val) {
      if (this.combinationInfo.benchMarks.length && this.combinationInfo.benchMarks.length > 1) {
        if (!this.isRepeat(this.combinationInfo.benchMarks,'code')) {
          this.$message.warning('所选名称不能重复！')
          return
        }
      }
    },
     // 判断数组中是否有重复数据（true 不存在；false 存在重复）
    isRepeat(arr, key) {
      var obj = {};
      for (let i = 0; i < arr.length; i ++) {
          if (obj[arr[i][key]]) {
              return false;    // 存在
          } else {
            obj[arr[i][key]] = arr[i];
          }
      }
      return true;
    },
    // 名称值变化时
    changePercentage (val) {
      this.benchmarkTotal = 0
      if (this.combinationInfo.benchMarks.length && this.combinationInfo.benchMarks.length > 0) {
        for(let i = 0; i < this.combinationInfo.benchMarks.length; i++) {
          if (this.combinationInfo.benchMarks[i].percentage === '') {
            break
          }
          this.benchmarkTotal+=parseFloat(this.combinationInfo.benchMarks[i].percentage)
        }
      }
    },
    // 提交
    onConfirm() {
      if (this.combinationInfo.benchMarks) {
          for(let i = 0; i< this.combinationInfo.benchMarks.length; i++) {
            if (this.combinationInfo.benchMarks[i].code) {
              this.benchmarkRule = false
            } else {
              this.benchmarkRule = true
              return
            }
          }
        }
        if (this.benchmarkTotal !== 100) {
          this.$message.warning('名称比例之和需为100%！')
          return
         }
     },
     // 取消
    onClose() {
      this.benchmarkRule = false
      this.dialogVisible = false
    },
},