Guide to emitting a value using the composition API

Question

I'm currently working with a datepicker component that is part of a form in my Vue3 app using the composition API.

My challenge is how to pass a value from the datepicker component back up to the form component.

Unfortunately, I've encountered some issues while trying to solve this:

setup(context){
....
 function emitDate(){
   context.emit('chosenDate', datepickerValue.value)
 }
}

setup(){
....
  function emitDate(){
    this.$emit('chosenDate', datepickerValue.value)
  }
}

Answer 1

Answer №1

To successfully trigger an event, you must include emit as a parameter in the setup function:

setup(props, { emit }) {

function emitDate(){
  emit('chosenDate', datepickerValue.value)
}

Alternatively, in script setup:

const emit = defineEmits(['chosenDate'])

function emitDate() {
  emit('chosenDate', datepickerValue.value)
}

Answer 2

To successfully trigger an event, you must include emit as a parameter in the setup function:

setup(props, { emit }) {

function emitDate(){
  emit('chosenDate', datepickerValue.value)
}

Alternatively, in script setup:

const emit = defineEmits(['chosenDate'])

function emitDate() {
  emit('chosenDate', datepickerValue.value)
}

Answer 3

When using the setup function, the first parameter is typically props. The context object is then used to access features like setup arguments:

setup(props, context){
....
 function emitDate(){
   context.emit('chosenDate', datepickerValue.value)
 }
}

Alternatively:

setup(props, { emit }){
....
 function emitDate(){
   emit('chosenDate', datepickerValue.value)
 }
}

Answer 4

When using the setup function, the first parameter is typically props. The context object is then used to access features like setup arguments:

setup(props, context){
....
 function emitDate(){
   context.emit('chosenDate', datepickerValue.value)
 }
}

Alternatively:

setup(props, { emit }){
....
 function emitDate(){
   emit('chosenDate', datepickerValue.value)
 }
}