Vuejs3从子组件向父组件发出事件

j8yoct9x 于 2023-04-12 发布在 Vue.js

关注(0)|答案(2)|浏览(194)

我最近开始使用VueJS，我使用的是v3，似乎在调用父对象上的方法时遇到了问题。子对象中的emit函数似乎没有发出事件，父对象中也没有拾取任何东西。
我已经包括父和子，以显示我如何设置它

父级

<template>
  <First/>
  < Child v-bind:sample="sample" @enlarge-text="onEnlargeText"/>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
import axios from 'axios';
import First from './First.vue';
import Child from './Child.vue';

export default defineComponent({
  name: 'Container',
  components: {
    First,
    Child,
  },
  methods: {
    onEnlargeText() {
      console.log('enlargeText');
    },
  },
  data: () => ({
    sample: [],
    parentmessage: '',
  }),
  created() {
    axios.get('http://localhost:8080/getData')
      .then((response) => {
        console.log(response);
        this.sample = response.data;
      })
      .catch((error) => {
        console.log(error);
      });
  },
});
</script>

孩子

<template>
  <div id="add">
    <form id="signup-form" @submit.prevent="submit">
      <label for="text">Text:</label>
      <input type="text" v-model="text" required>
      <p class="error" >{{ error }}</p>
      <div class="field has-text-right">
        <button type="submit" class="button is-danger">Submit</button>
      </div>
    </form>
    <button v-on:click="tryThis">
      Enlarge text
    </button>
</div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';
import axios from 'axios';

interface SampleInterface {
  text: string;
  error: string;
}

export default defineComponent({
  name: 'Add',
  data: (): AddInterface => ({
    text: '',
    error: '',
  }),
  methods: {
    tryThis() {
      this.$emit('enlarge-text');
    },
    submit() {
      this.$emit('enlarge-text');
    },
  },
});
</script>

这应该怎么做？我是不是漏掉了什么？
我想知道我还能在这里使用$emit吗？

vue.js

来源：https://stackoverflow.com/questions/64605807/vuejs-3-emit-event-from-child-to-parent-component

2条答案

按热度按时间

jjhzyzn01#

您应该添加包含已发出事件名称的新emits option：
孩子：

<template>
  <div id="child">
    <button v-on:click="tryThis">Enlarge text</button>
  </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Child",
  emits: ["enlargeText"],
  methods: {
    tryThis() {
      console.log("trying");
      this.$emit("enlargeText", "someValue");
    },
  },
});
</script>

或使用脚本设置语法：

<template>
  <div id="child">
    <button v-on:click="tryThis">Enlarge text</button>
  </div>
</template>

<script lang="ts">

 const emit= defineEmits(["enlargeText"])
 
  function tryThis() {
      console.log("trying");
      emit("enlargeText", "someValue");
    }

</script>

家长：

<template>
  <div>
    <p>Container</p>
    <Child @enlargeText="onEnlargeText" />
  </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";
import Child from "./Child.vue";

export default defineComponent({
  name: "UrlContainer",
  components: {
    Child,
  },
  methods: {
    onEnlargeText() {
      console.log("enlarging text");
    },
  },
});
</script>

LIVE DEMO

赞(0）回复(0）举报 2023-04-12

krcsximq2#

或者可以使用v-model和update event：

// ChildComponent.vue
<template>
  <div>
    <input type="button" @click="increment" value="Click" />
    childCounter: {{ childCounter }}
  </div>
</template>

<script>
export default {
  data() {
    return {
      childCounter:0
    }
  },
  methods: {
    increment() {
      // emit custom update event to update the parent value
      this.$emit('update:childCounter', ++this.childCounter);
    }
  }
}
</script>

// ParentComponent.vue
<template>
  <div>
    <!-- basically means:
      <Child :childCounter="parentCounter" 
             @update:childCounter="(childCounter) => parentCounter = childCounter"
    />
    -->
    <Child v-model:childCounter="parentCounter"></Child>
    parentCounter: {{ parentCounter }}<br/>
  </div>
</template>

<script>
import Child from './ChildComponent.vue'

export default {
  components: {
    Child
  },
  data() {
    return {
      parentCounter: 0
    }
  },
}
</script>

赞(0）回复(0）举报 2023-04-12

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Vuejs3从子组件向父组件发出事件

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