您的位置：首页 > 编程学习 > > 正文

vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）

更多时间：2021-10-04 01:31:18 类别：编程学习浏览量：2568

vue动态生成的下拉框如何获取值

Vue 级联下拉框的设计与实现

CREATE TABLE `supplies_type` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `category_type` varchar(64) NOT NULL COMMENT '类别种类：大类、中类、小类',
  `big_category_name` varchar(64) NOT NULL COMMENT '大类名称',
  `middle_category_name` varchar(64) DEFAULT NULL COMMENT '中类名称',
  `small_category_name` varchar(64) DEFAULT NULL COMMENT '小类名称',
  `parent_id` int(11) DEFAULT NULL,
  `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `create_user_name` varchar(64) DEFAULT NULL COMMENT '创建人用户名',
  `update_time` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
  `is_deleted` tinyint(1) DEFAULT '0' COMMENT '是否删除，1表示已删除',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

数据库截图如下图所示，注：本系统为了减少查询次数，故冗余了一些字段，读者可根据自己的需求调整。

vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）

核心设计在于parent_id，根据parent_id字段即可查询到子类，结果如下图所示：

vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）

2.前端页面

前端页面效果如下：

vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）

Html代码如下：

<li class="app-container">
    <span style="margin-left:120px;margin-right: 20px;width: 150px;display: inline-block;">大类：</span>
    <el-select v-model="big" placeholder="请选择" @change="getSuppliesType(big)" style="width: 19%;">
      <el-option
        v-for="item in bigTypes"
        :key="item.bigCategoryName"
        :label="item.bigCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
    <span style="margin-left:120px;margin-right: 20px; width: 150px;display: inline-block;">中类：</span>
    <el-select v-model="middle" placeholder="请选择" @change="getSuppliesType(middle)" style="width: 19%;">
      <el-option
        v-for="item in middleTypes"
        :key="item.middleCategoryName"
        :label="item.middleCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
    <br>
    <br>
    <br>
    <span style="margin-left:120px;margin-right: 20px;width: 150px; margin-top:20px; display: inline-block;">小类：</span>
    <el-select v-model="small" placeholder="请选择" style="width: 19%;">
      <el-option
        v-for="item in smallTypes"
        :key="item.smallCategoryName"
        :label="item.smallCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
</li>

上面的item.smallCategoryName、item.smallCategoryName数据为后端从数据库中查询出来的数据（驼峰命名），后端只负责查询、并返回结果。

Vue中数据定义如下：

data() {
    return {
        big: '',
        bigTypes: null,
        middle: '',
        middleTypes: null,
        small: '',
        smallTypes: null
    }
},

在页面初始化时，自动获取大类列表：

created() {
		this.getSuppliesType(0)
},

页面中的getSuppliesType方法如下：

getSuppliesType(id) {
  this.listLoading = true
  const queryData = {
    parentId: id
  }
  //此处的调用后端接口按照自己的调用方式写即可
  //此处的getSuppliersType是项目中自己封装的util中的方法
  //如果请求方式是post，JSON.stri.jpg" alt="vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）" border="0" />

3.一个完整的demo

下面这个页面为完成代码，其中的数据为部分数据，后台接口获取使用JS来完成。

<template>
  <li class="app-container">
    <span style="margin-left:120px;margin-right: 20px;width: 150px;display: inline-block;">大类：</span>
    <el-select v-model="big" placeholder="请选择" @change="getSuppliesType(big)" style="width: 19%;">
      <el-option
        v-for="item in bigTypes"
        :key="item.bigCategoryName"
        :label="item.bigCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
    <span style="margin-left:120px;margin-right: 20px; width: 150px;display: inline-block;">中类：</span>
    <el-select v-model="middle" placeholder="请选择" @change="getSuppliesType(middle)" style="width: 19%;">
      <el-option
        v-for="item in middleTypes"
        :key="item.middleCategoryName"
        :label="item.middleCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
    <br>
    <br>
    <br>
    <span style="margin-left:120px;margin-right: 20px;width: 150px; margin-top:20px; display: inline-block;">小类：</span>
    <el-select v-model="small" placeholder="请选择" style="width: 19%;">
      <el-option
        v-for="item in smallTypes"
        :key="item.smallCategoryName"
        :label="item.smallCategoryName"
        :value="item.id">
      </el-option>
    </el-select>
    <br>
    <br>
    <br>
    <el-button type="primary" round style="margin-left:280px" @click.native.prevent="commit">添加</el-button>
    <el-button type="primary" round style="margin-left:100px" @click.native.prevent="cancel">取消</el-button>
  </li>
</template>

<script>
    export default {
        filters: {
            parseTime(timestamp) {
                return parseTime(timestamp, null)
            }
        },
        data() {
            return {
                big: '',
                bigTypes: null,
                middle: '',
                middleTypes: null,
                small: '',
                smallTypes: null,
                dataList: [
                    {"id":1,"categoryType":"BIG","bigCategoryName":"1.现场管理与保障","middleCategoryName":null,"smallCategoryName":null,"parentId":0,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":"2021-07-04T13:34:31.000+0000","isDeleted":false},
                    {"id":27,"categoryType":"BIG","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":null,"smallCategoryName":null,"parentId":0,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":2,"categoryType":"MIDDLE","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":null,"parentId":1,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":10,"categoryType":"MIDDLE","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.2现场安全","smallCategoryName":null,"parentId":1,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":3,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.1气象监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":4,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.2地震监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":5,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.3地质灾害监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":6,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.4水文监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":7,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.5环境监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":8,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.6疫病监测","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":9,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.1现场监测","smallCategoryName":"1.1.7观察测量","parentId":2,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":11,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.2现场安全","smallCategoryName":"1.2.1现场照明","parentId":10,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":12,"categoryType":"SMALL","bigCategoryName":"1.现场管理与保障","middleCategoryName":"1.2现场安全","smallCategoryName":"1.2.2现场警戒","parentId":10,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":28,"categoryType":"MIDDLE","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":null,"parentId":27,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":34,"categoryType":"MIDDLE","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":null,"parentId":27,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":"2021-07-04T13:03:23.000+0000","isDeleted":false},
                    {"id":29,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":"2.1.1卫生防疫","parentId":28,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":30,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":"2.1.2消防防护","parentId":28,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":31,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":"2.1.3化学与放射","parentId":28,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":32,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":"2.1.4防高空坠落","parentId":28,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":33,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.1人员安全防护","smallCategoryName":"2.1.5通用防护","parentId":28,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":35,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":"2.2.1生命搜索","parentId":34,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":36,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":"2.2.2攀岩营救","parentId":34,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":37,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":"2.2.3破拆起重","parentId":34,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":38,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":"2.2.4水下营救","parentId":34,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false},
                    {"id":39,"categoryType":"SMALL","bigCategoryName":"2.生命救援与生活救助","middleCategoryName":"2.2生命搜救与营救","smallCategoryName":"2.2.5通用工具","parentId":34,"createTime":"2021-07-04T11:13:36.000+0000","createUserName":null,"updateTime":null,"isDeleted":false}
                    ]
            }
        },
        created() {
            this.getSuppliesType(0)
        },
        methods: {
            getSuppliesType(id) {
                const queryData = {
                    parentId: id
                }
                //此处为js模拟，真实数据的获取还需要后台接口的支持
                getSuppliersType(JSON.stri.jpg" alt="vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）" border="0" />

又到了分隔线以下，本文到此就结束了，本文内容全部都是由博主自己进行整理并结合自身的理解进行总结

到此这篇关于Vue 级联下拉框的设计与实现的文章就介绍到这了,更多相关Vue 级联下拉框内容请搜索开心学习网以前的文章或继续浏览下面的相关文章希望大家以后多多支持开心学习网！

标签：Vue 级联下拉框

上一篇：mysql全表查询如何优化（MySQL 分组查询的优化方法）

下一篇：腾讯云服务器如何安装宝塔面板（腾讯云服务器打开宝塔面板失败是怎么回事？）

您可能感兴趣

vue动态生成的下拉框如何获取值（Vue 级联下拉框的设计与实现）

vue动态生成的下拉框如何获取值

目录

热门推荐

排行榜