Vue学习15----父组件主动获取子组件的数据和方法，子组件主动获取父组件的数据和方法

父组件主动获取子组件的数据和方法：
1.调用子组件的时候定义一个ref

 <v-header ref="header"></v-header>

2.在父组件里面通过

 this.$refs.header.属性
 this.$refs.header.方法

子组件主动获取父组件的数据和方法：

 this.$parent.数据
 this.$parent.方法

下面写一个例子：
效果图：

 项目结构：

App.vue是父组件
Home.vue是子组件

父组件：App.vue

<!--父组件给子组件传值-->
<template>
  <div>

    <IHome ref="home"></IHome>
    <button @click="getSonMethod">父组件调用子组件的方法和属性</button>
  </div>
</template>

<script>
  /**

   父组件主动获取子组件的数据和方法：

   1.调用子组件的时候定义一个ref
   <v-header ref="header"></v-header>
   2.在父组件里面通过
   this.$refs.header.属性
   this.$refs.header.方法

   子组件主动获取父组件的数据和方法：
   this.$parent.数据
   this.$parent.方法

   */
  import IHome from './components/Home.vue';

  export default {
    name: 'app',
    data() {
      return {
        title: '标题',
        content:'内容',
      }
    },
    methods:{
      iFatherMethod(arge){
        alert('父组件的iFatherMethod'+arge);
      },
      getSonMethod(){
        //拿到子组件的变量
        alert(this.$refs.home.msg);
        //调用子组件的方法
        this.$refs.home.isonmethod1();

      }
    },
    components: {
      /*前面的组件名称不能和html标签一样,会出现冲突*/
      'IHome': IHome,
    }
  }
</script>

<style lang="scss" scoped>
  .content {
    font-size: 50px;
  }
  button {
    width: 100%;
    line-height: 150px;
    text-align: center;
    font-size: 50px;
  }


</style>

子组件：Home.vue

<!--模板，里面写html-->
<template>
  <!--根组件，只能有一个根组件-->
  <div>
    <!--显示父组件传过来的值-->
    <div class="head">{{msg}}</div>
    <button @click="isdiaomethod">子组件调用父组件的方法</button>
  </div>
</template>

<!--script里面写逻辑-->
<script>
  export default {
    name: "IHeader",
    data() {
      return {
        msg: '子组件的变量',
      }
    },
    methods: {
        isonmethod1(){
          alert("子组件的isonmethod1方法");
        },
        isdiaomethod(){
          this.$parent.iFatherMethod("111");
        }
    },
  }
</script>


<!--style里面写样式-->
<style lang="scss" scoped>
  /*scoped  css只在本文件中起作用*/
  .head {
    width: 100%;
    line-height: 150px;
    text-align: center;
    background-color: aqua;
    font-size: 50px;
  }

  button {
    width: 100%;
    line-height: 150px;
    text-align: center;
    font-size: 50px;
  }

</style>

源码下载：
vuedemo15
https://download.csdn.net/download/zhaihaohao1/11112029

转载：https://blog.csdn.net/zhaihaohao1/article/details/89021956

-----------------------------------------------------------------------自己项目-----------------------------------------------------------------------------------------

welcome.vue

<template>
  <div>
    <!-- 引入组件  定义一个on的方法监听子组件的状态 -->

    <demo1 ref="demo1"> </demo1>
    <el-button type="primary" @click="getSonMethod">主要按钮</el-button>
  </div>
</template>


<script>
import demo1 from "./demo1.vue";
export default {
  components: {
    demo1,
  },
  data() {
    return {
      //父传子值
      num: "",
    };
  },

  methods: {
    getSonMethod() {
      //调用子组件的属性
      this.$refs.demo1.dialogFormVisible = true;
    },
  },
};
</script>

<style>
</style>

demo1.vue

<template>
  <div>
    <el-dialog title="收货地址" :visible.sync="dialogFormVisible">
      <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=" 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=" 100%"
              ></el-time-picker>
            </el-form-item>
          </el-col>
        </el-form-item>
        <el-form-item label="即时配送" prop="delivery">
          <el-switch v-model="ruleForm.delivery"></el-switch>
        </el-form-item>
        <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-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>
    </el-dialog>
  </div>
</template>

<script>
export default {
  //接受父组件的值
  data() {
    return {
      dialogTableVisible: false,
      dialogFormVisible: false,
      ruleForm: {
        name: "",
        region: "",
        date1: "",
        date2: "",
        delivery: false,
        type: [],
        resource: "",
        desc: "",
      },
      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",
          },
        ],
        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" }],
      },
      formLabelWidth: "120px",
    };
  },
  methods: {
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          alert("submit!");
        } else {
          console.log("error submit!!");
          return false;
        }
      });
    },
    resetForm(formName) {
      this.$refs[formName].resetFields();
      this.dialogFormVisible = false;
    },
  },
};
</script>

<style>
</style>