Vue2 实现分类选择

发布时间：2023年12月26日

在这里插入图片描述

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>

    <link
      rel="stylesheet"
      href="https://unpkg.com/element-ui/lib/theme-chalk/index.css"
    />
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.13/vue.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@unocss/runtime"></script>
    <script src="https://unpkg.com/element-ui/lib/index.js"></script>

    <!-- <link rel="stylesheet" href="./vue/element_ui.css" />
    <script src="./vue/vue.js"></script>
    <script src="./vue/unocss.js"></script>
    <script src="./vue/element_ui.js"></script> -->
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
    </style>
  </head>

  <body>
    <div id="app" class="h-100vh flex justify-center items-center">
      <div>
        <div class="flex items-center gap-20px mb-20px">
          <div
            v-for="(item,i) in cities"
            @click="index = i"
            :class="{'text-blue border-blue': i == index}"
            class="h-30px border-solid border-1px px-5px flex items-center rounded-5px cursor-pointer"
          >
            <div>
              <el-checkbox
                v-model="item.checkAll"
                @change="handleCheckAllChange($event,item.list)"
                :indeterminate="getCheck(item.list,item.checkAll)"
              ></el-checkbox>
            </div>

            <div class="ml-5px">{{item.name}}</div>
          </div>
        </div>

        <el-checkbox-group v-model="selectId">
          <el-checkbox
            v-for="city in cities[index].list"
            :label="city.id"
            :key="city.id"
            @change="checkSelf($event)"
            >{{city.name}}</el-checkbox
          >
        </el-checkbox-group>
      </div>
    </div>
    <script>
      new Vue({
        el: '#app',
        data() {
          return {
            cities: [
              {
                name: '无职转生',
                checkAll: false,
                list: [
                  {
                    id: 27,
                    name: '鲁迪乌斯',
                  },
                  {
                    id: 28,
                    name: '艾莉丝',
                  },
                ],
              },
              {
                name: '葬送的芙莉莲',
                checkAll: false,
                list: [
                  {
                    id: 29,
                    name: '芙莉莲',
                  },
                  {
                    id: 30,
                    name: '菲伦',
                  },
                ],
              },
            ],
            index: 0,
            selectId: [],
          };
        },
        computed: {
          getCheck() {
            return (item, checkAll) => {
              let newList = item.map((e) => e.id);

              let ee = this.selectId.find((v) => newList.includes(v));

              if (ee && !checkAll) {
                return true;
              } else {
                return false;
              }
            };
          },
        },
        methods: {
          handleCheckAllChange(val, list) {
            let ids = list.map((e) => e.id);
            if (val) {
              let newId = ids.filter((e) => !this.selectId.includes(e));
              this.selectId.push(...newId);
            } else {
              this.selectId = this.selectId.filter((e) => !ids.includes(e));
            }
          },
          checkSelf(e) {
            if (e) {
              let allIds = this.cities[this.index].list.map((v) => v.id);

              let selectAll = allIds.filter((v) => this.selectId.includes(v));

              this.cities[this.index].checkAll =
                selectAll.length == allIds.length;
            } else {
              this.cities[this.index].checkAll = false;
            }
          },
        },
        created() {
          // 模拟后端数据回显
          for (let i = 0; i < this.cities.length; i++) {
            let allIds = this.cities[i].list.map((v) => v.id);
            let selectAll = allIds.filter((v) => this.selectId.includes(v));
            this.cities[i].checkAll = selectAll.length == allIds.length;
          }
        },
      });
    </script>
  </body>
</html>
文章来源:https://blog.csdn.net/weixin_65084919/article/details/135213325
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