Vue 및 Element-UI를 사용하여 다단계 연결 드롭다운 상자 기능을 구현하는 방법

npm install vue
npm install element-ui

brands: [
    {
        id: 1,
        name: '奥迪',
        models: [
            {
                id: 1,
                name: 'A4'
            },
            {
                id: 2,
                name: 'A6'
            }
        ]
    },
    {
        id: 2,
        name: '宝马',
        models: [
            {
                id: 3,
                name: 'X3'
            },
            {
                id: 4,
                name: 'X5'
            }
        ]
    }
]

<template>
  <div>
    <el-cascader
      :options="brands"
      v-model="selectedValues"
      @change="handleChange"
      :props="{ value: 'id', label: 'name', children: 'models' }"
    ></el-cascader>
  </div>
</template>

<script>
export default {
  data() {
    return {
      brands: [...], // 编辑为上面提到的数据结构
      selectedValues: []
    };
  },
  methods: {
    handleChange(value) {
      console.log(value);
    }
  }
};
</script>

import Vue from 'vue';
import Cascader from './Cascader.vue';

new Vue({
  render: (h) => h(Cascader)
}).$mount('#app');

<template>
  <div>
    <el-cascader
      :options="brands"
      v-model="selectedValues"
      @change="handleChange"
      :props="{ value: 'id', label: 'name', children: 'models' }"
    ></el-cascader>
    <el-cascader
      v-if="selectedValues[0]"
      :options="getBrandById(selectedValues[0]).models"
      v-model="selectedValues[1]"
      @change="handleChange"
      :props="{ value: 'id', label: 'name' }"
    ></el-cascader>
  </div>
</template>

<script>
export default {
  data() {
    return {
      brands: [...], // 编辑为上面提到的数据结构
      selectedValues: []
    };
  },
  methods: {
    handleChange(value) {
      console.log(value);
    },
    getBrandById(id) {
      return this.brands.find((brand) => brand.id === id);
    }
  }
};
</script>