javascript - vue.js 发射 $emit 未被 $on 接收

Question

Vue.component('rating-edit', {
    template:`
    <form>
      <input v-model="rating.title" type="text">
      <textarea v-model="rating.remark">{{rating.remark}}</textarea>
      <button type="button"
        @click="submit">
        Save
      </button>
    </form>`,
    props:['rating'],
    methods: {
      submit: function submit () {
        let rating = this.rating;
        this.$emit('submit', rating);
        console.log('submit was emitted');
      }
    }
  });

const aRating = {
    title: 'title',
    remark: 'remark'
  };

let vueApp = new Vue({
    el: '#rating-edit-container',
    data: {
      rating: aRating
    }
  });

vueApp.$on('submit', function(rating) {
  console.log('vue on submit', rating);
});

<script src="https://vuejs.org/js/vue.min.js"></script>
<div id="rating-edit-container">
  <rating-edit :rating="rating"></rating-edit>
</div>

在遗留前端代码中，我想实现一个基于 vue 的组件化表单，并让它在提交时返回数据。

这是组件代码。请注意触发 this.$emit('submit', rating);

的提交函数

let result = {
  props:['rating'],
  methods: {
    submit: function submit () {
      let rating = this.rating;
      this.$emit('submit', rating);
      console.log('submit fired');
    }
  }
};

export default result;

现在在遗留代码中，我正在等待事件:

import Vue from 'vue';
import ratingEditVue from './rating-edit.vue';


Vue.component('rating-edit', ratingEditVue);

const aRating = {
  title: 'title',
  remark: 'remark'
};

let vueApp = new Vue({
  el: '#rating-edit-container',
  data: {
    rating: aRating
  }
});

vueApp.$on('submit', function(rating) {
  console.log('vue on submit', rating);
});

据我了解 Vue 事件，这应该可行。但是 $on('submit', handlerFunction) 永远不会被调用。

附录:

我已经摆弄了这个例子。我为一开始没有这样做而道歉。

Answer 1

问题是您沿着 rating-edit 组件的相同范围深度发射。

如果您改为使用 this.$parent.$emit 向父级发送，事件将由父级接收。请注意，如果您需要在多个位置或多个深度执行此操作，则需要改用事件总线。

Vue.component('rating-edit', {
    template:`
    <form>
      <input v-model="rating.title" type="text">
      <textarea v-model="rating.remark">{{rating.remark}}</textarea>
      <button type="button"
        @click="submit">
        Save
      </button>
    </form>`,
    props:['rating'],
    methods: {
      submit: function submit () {
        let rating = this.rating;
        this.$parent.$emit('submit', rating);
        console.log('submit was emitted');
      }
    }
  });

const aRating = {
    title: 'title',
    remark: 'remark'
  };

let vueApp = new Vue({
    el: '#rating-edit-container',
    data: {
      rating: aRating
    }
  });

vueApp.$on('submit', function(rating) {
  console.log('vue on submit', rating);
});

<script src="https://vuejs.org/js/vue.min.js"></script>
<div id="rating-edit-container">
  <rating-edit :rating="rating"></rating-edit>
</div>