<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.15.6/lib/index.js"></script>

<h1>
  <a href="https://element.eleme.io/#/zh-CN/component/form">https://element.eleme.io/#/zh-CN/component/form</a>
</h1>
<div id="app">
<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
  <el-form-item label="活动名称" prop="name">
    <el-input v-model="ruleForm.name"></el-input>
  </el-form-item>
  <el-form-item label="活动区域" prop="region">
    <el-select v-model="ruleForm.region" placeholder="请选择活动区域">
      <el-option label="区域一" value="shanghai"></el-option>
      <el-option label="区域二" value="beijing"></el-option>
    </el-select>
  </el-form-item>
  <el-form-item label="活动时间" required>
    <el-col :span="11">
      <el-form-item prop="date1">
        <el-date-picker type="date" placeholder="选择日期" v-model="ruleForm.date1" style="width: 100%;"></el-date-picker>
      </el-form-item>
    </el-col>
    <el-col class="line" :span="2">-</el-col>
    <el-col :span="11">
      <el-form-item prop="date2">
        <el-time-picker placeholder="选择时间" v-model="ruleForm.date2" style="width: 100%;"></el-time-picker>
      </el-form-item>
    </el-col>
  </el-form-item>
  <el-form-item label="即时配送" prop="delivery">
    <el-switch
        @change="switchChange"
        v-model="ruleForm.delivery">
    </el-switch>
  </el-form-item>
<!-- v-if 动态控制 ✅ -->
<!--   <el-form-item
      v-if="ruleForm.arr.length"
      :rules="[
         {
            type: 'array', 
            required: true,
            message: '请至少选择一个活动性质',
            trigger: 'change',
         }
      ]"
      label="活动性质"
      prop="type"> -->
    <el-form-item
      label="活动性质"
      prop="type">
    <el-checkbox-group v-model="ruleForm.type">
<!--       <el-checkbox label="美食/餐厅线上活动" name="type"></el-checkbox>
      <el-checkbox label="地推活动" name="type"></el-checkbox>
      <el-checkbox label="线下主题活动" name="type"></el-checkbox>
      <el-checkbox label="单纯品牌曝光" name="type"></el-checkbox> -->
      
      <el-checkbox
          v-for="(obj, i) in ruleForm.arr"
          :key="i"
          :label="obj.label"
          name="type">
       </el-checkbox>
    </el-checkbox-group>
  </el-form-item>
  <el-form-item label="特殊资源" prop="resource">
    <el-radio-group v-model="ruleForm.resource">
      <el-radio label="线上品牌商赞助"></el-radio>
      <el-radio label="线下场地免费"></el-radio>
    </el-radio-group>
  </el-form-item>
  <el-form-item label="活动形式" prop="desc">
    <el-input type="textarea" v-model="ruleForm.desc"></el-input>
  </el-form-item>
  <el-form-item>
    <el-button type="primary" @click="submitForm('ruleForm')">立即创建</el-button>
    <el-button @click="resetForm('ruleForm')">重置</el-button>
  </el-form-item>
</el-form>
</div>
@import url("//unpkg.com/element-ui@2.15.6/lib/theme-chalk/index.css");


var Main = {
    data() {
      return {
        ruleForm: {
          name: '',
          region: '',
          date1: '',
          date2: '',
          delivery: false,
          type: [],
          resource: '',
          desc: '',
          arr: [
            {
              label: "美食/餐厅线上活动",
              name: "type",
            },{
              label: "地推活动",
              name: "type",
            },{
              label: "线下主题活动",
              name: "type",
            },{
              label: "单纯品牌曝光",
              name: "type",
            },
          ],
        },
        rules: {
          name: [
            { required: true, message: '请输入活动名称', trigger: 'blur' },
            { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
          ],
          region: [
            { required: true, message: '请选择活动区域', trigger: 'change' }
          ],
          date1: [
            { type: 'date', required: true, message: '请选择日期', trigger: 'change' }
          ],
          date2: [
            { type: 'date', required: true, message: '请选择时间', trigger: 'change' }
          ],
          // 无法动态控制 ❌
          // type: [
          //   { type: 'array', required: true, message: '请至少选择一个活动性质', trigger: 'change' }
          // ],
           type: [
            { type: 'array', required: true, message: '请至少选择一个活动性质', trigger: 'change' }
          ],
          resource: [
            { required: true, message: '请选择活动资源', trigger: 'change' }
          ],
          desc: [
            { required: true, message: '请填写活动形式', trigger: 'blur' }
          ]
        },
        arr: [
          {
            label: "美食/餐厅线上活动",
            name: "type",
          },{
            label: "地推活动",
            name: "type",
          },{
            label: "线下主题活动",
            name: "type",
          },{
            label: "单纯品牌曝光",
            name: "type",
          },
        ],
      };
    },
    methods: {
      switchChange (val) { 
        console.log('val =',val);
        if(!val) {
          this.ruleForm.arr = this.arr;
          // js 动态控制 required ✅ 
          this.rules.type[0].required = true;
        } else {
          this.ruleForm.arr = [];
          // js 动态控制 required ✅ 
          this.rules.type[0].required = false;
        }
      },
      submitForm(formName) {
        this.$refs[formName].validate((valid, object) => {
          if (valid) {
            alert('submit!');
          } else {
            // console.log('error submit!!', valid);
            console.log('valid =', valid, object);
            return false;
          }
        });
      },
      resetForm(formName) {
        this.$refs[formName].resetFields();
      }
    }
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

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