vue 子组件触发父组件方法的两种方式

https://www.cnblogs.com/menggang89-chen/p/12021400.html

 

第一种方法:

如下:通过this.emit()来触发父组件的方法。具体就是子组件触发emit()来触发父组件的方法。具体就是子组件触发emit()来触发父组件的方法。具体就是子组件触发emit绑定的事件watchChild,然后父组件监听watchChild,一旦watchChild被触发便会触发父组件的parentReceive方法。
父组件:

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<template>
<div>
<div @click="openChild">弹弹弹,弹出子组件</div>
<childs ref="alert" @watchChild="parentReceive"></childs<!--监听子组件绑定的方法-->
</div>
</template>
  
<script>
import childs from '../components/modal/Alert'
export default{
    data(){
        return {
            msg: '我是父组件的msg!!!'
        }
    },
    components:{
        childs
    },
    methods:{
        parentReceive(message){
            alert(message);
        },
        openChild(){
            this.$refs.alert.open('我是子组件','子组件内容!!!!!');
        }
    }
}
</script>
  
<style>
</style>

  

子组件:

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<template>
  <modal :show='show' ref="modal">
    <div slot="title">{{title}}</div>
    <div slot="content">{{content}}</div>
    <div slot="buttons" class="modal-buttons">
      <span class="modal-button" @click="_onClick()">确定</span>
    </div>
  </modal>
</template>
  
<script>
import Modal from './Modal'
  
export default {
  props: {
    show: {
      type: Boolean,
      default: false
    },
    okText: {
      type: String,
      default: '确定'
    },
  },
  data(){
    return {
        title: '',
        content: ''
    }
  },
  components: {
    Modal
  },
  methods: {
    open (title, content) {
        this.title = title
        this.content = content
      this.$refs.modal.open()
    },
    close () {
        this.title = ''
        this.content = ''      
      this.$refs.modal.close()
    },
        _onClick(){
            this.close();
            this.$emit('watchChild','我是从子组件传过来的内容!!!');    //触发$emit绑定的watchChild方法
        }
  }
}
</script>

  

第二种方法:

在子组件props中定义属性onOK,类型为function,然后在父组件中把要触发的方法名传递给onOK属性,最后在子组件中判断onOk是否存在,是的话直接执行这个方法。
父组件:

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<template>
<div>
<div @click="openChild">弹弹弹,弹出子组件</div>
<childs ref="alert" :on-ok="parentReceive"></childs>  <!--把父组件的方法名传给子组件的onOK属性-->
</div>
</template>
  
<script>
import childs from '../components/modal/Alert'
export default{
    data(){
        return {
            msg: '我是父组件的msg!!!'
        }
    },
    components:{
        childs
    },
    methods:{
        parentReceive(message){
            alert(message);
        },
        openChild(){
            this.$refs.alert.open('我是子组件','子组件内容!!!!!');
        }
    }
}
</script>
  
<style>
</style>

  

子组件:

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<template>
  <modal :show='show' ref="modal">
    <div slot="title">{{title}}</div>
    <div slot="content">{{content}}</div>
    <div slot="buttons" class="modal-buttons">
      <span class="modal-button" @click="_onClick()">确定</span>
    </div>
  </modal>
</template>
  
<script>
import Modal from './Modal'
  
export default {
  props: {
    show: {
      type: Boolean,
      default: false
    },
    okText: {
      type: String,
      default: '确定'
    },
    onOk: {    //定义onOK属性
      type: Function
    }
  },
  data(){
    return {
        title: '',
        content: ''
    }
  },
  components: {
    Modal
  },
  methods: {
    open (title, content) {
        this.title = title
        this.content = content
      this.$refs.modal.open()
    },
    close () {
        this.title = ''
        this.content = ''      
      this.$refs.modal.close()
    },
        _onClick(){
            this.close();
            if(this.onOk){
                this.onOk('我是子组件传递过来的数据!!!!');
            }
        }
  }
}
</script>
posted @ 2021-03-08 15:57  A汉克先生  阅读(749)  评论(0编辑  收藏  举报