I am using Vue.js 2.0 and I am trying to emit an event from `child component`

问题

I am using Vue.js 2.0 and I am trying to emit an event from child component to parent component but it's not working.

You can see my code below:

child component:

<template>
  <button @click="confirmSendMessage">Send</button>
</template>

<script>
  export default {
    methods: {
      confirmSendMessage () {
        this.$emit('confirmed')
      }
    }
</script>

parent component:

<template>
    <ConfirmMessage/>
</template>

<script>
    import ConfirmMessage from './ConfirmMessage'
    export default {
        events: {
           confirmed() {
              console.log('confirmed')
           }
        },
        components: {
            ConfirmMessage
        }
   }
</script>

When I click on the button, nothing appears to me on the Chrome console. I don't know why. Can anybody help me? I am new on Vue JS.

回答1:

You missed to listen the emitted event. Use v-on to listen to the event:

<!--                               vv -> call method -->
<ConfirmMessage v-on:confirmed="confirmed" />
<!--                  ^^ -> emitted event -->

回答2:

You have to listen the events, if you look the Emit Documentation, it expects as first argument the name of the event as string, an then the values (if you have) you want to pass to the listener.

so it will be:

<confirm-message :nameOfEvent="functionToExecuteWhenTheEventIsEmitted" />

the method:

functionToExecuteWhenTeEventIsEmitted(someValue) { //do whatever with someValue}

and on the child:

this.$emit('nameOfEvent', someValue)

In your case

You aren't passing values so this.$emmit('confirmed') and <ConfirmMessage :confirmed="confirmed"> it will be enought

来源：https://stackoverflow.com/questions/49387868/i-am-using-vue-js-2-0-and-i-am-trying-to-emit-an-event-from-child-component

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javascript

Vue.js

emit