javascript - Vue - 无法使用 $emit 事件将数据从组件传递到父级

Question

Pass data from child to parent in Vuejs (is it so complicated?)

Can't pass data from children to parent component with emit

$emit an event from child to parent component Vue 2

我已经浏览了上面的帖子和 Vue 文档。据我所知，我做的一切都是正确的，但它仍然不起作用。

我已经包含了我的代码，但恐怕无法使用堆栈片段进行复制。可以在此处找到工作复制品 code sandbox

<小时/>

按钮.vue

我在下面的 navigateTo() 函数下注意到，我的控制台确认组件上的函数正在获取正确的值，但我不确定该值是否已正确发出由组件或父级接收。

<template>
  <div class="navigation section columns">
    <div class="container column has-text-centered" v-for="button in navigation" :key="button.text">
      <button class="button is-primary" @click="navigateTo(button)" type="button">{{ button.text }}</button>
    </div>
  </div>
</template>
<script>
export default {
  name: "Buttons",
  props: {
    text: String,
    dest: String
  },
  computed: {},
  methods: {
    navigateTo(button) {
      // This console log correctly outputs "button dest 2"(or whatever the button value is)
      console.log("button dest", button.dest);
      this.$emit("navigate", button.dest);
    }
  },
  data() {
    return {
      navigation: [
        { text: "North", dest: "2" },
        { text: "East", dest: "3" },
        { text: "South", dest: "4" },
        { text: "West", dest: "5" }
      ]
    };
  }
};
</script>

App.vue

<template>
  <div id="app" class="container">
    <scene @navigate="navigateTo"></scene>
    <buttons></buttons>
  </div>
</template>

<script>
import Scene from "./components/Scene.vue";
import Buttons from "./components/Buttons.vue";

export default {
  name: "app",
  methods: {
    navigateTo(dest) {
      console.log('received value', dest);
      this.selectedScene = dest;
    }
  },
  components: {
    Scene,
    Buttons
  }
};
</script>
<style scoped>
</style>

Answer 1

发出事件的组件是按钮，您正在场景组件上监听该事件:

像这样更改你的 App.vue :

<template>
  <div id="app" class="container">
    <scene ></scene>
    <buttons @navigate="navigateTo" ></buttons>
  </div>
</template>

<script>
import Scene from "./components/Scene.vue";
import Buttons from "./components/Buttons.vue";

export default {
  name: "app",
  methods: {
    navigateTo(dest) {
      console.log('received value', dest);
      this.selectedScene = dest;
    }
  },
  components: {
    Scene,
    Buttons
  }
};
</script>
<style scoped>
</style>