What is the alternative to using this.$parent.$emit in Vue 3?

Question

What is the alternative to using this.$parent.$emit in Vue 3?

Recently, my application has been upgraded to Vue 3.

Following the migration, my linter flagged a deprecation error that is documented at this link: .

The documentation provides guidance on replacing this.$emit with the mitt library, however, it does not cover how to replace this.$parent.$emit.

javascript vue.js migration linter vuejs3

Answer 1

Answer №1

When working with child components:

setup(props, { emit }) {
   ...
   emit('customEvent', dataToSendToParent);
}

In the parent component:

<child-component @customEvent="onCustomEvent" />

...

onCustomEvent(dataReceivedFromChild) {
  ...
}

Answer 2

When working with child components:

setup(props, { emit }) {
   ...
   emit('customEvent', dataToSendToParent);
}

In the parent component:

<child-component @customEvent="onCustomEvent" />

...

onCustomEvent(dataReceivedFromChild) {
  ...
}

Answer 3

Answer №2

Utilizing the script setup syntax provides a convenient way to achieve the following:

<script setup>
    const emit = defineEmits(['close', 'test'])
    
    const handleClose = () => {
        emit('close')
        emit('test', { anything: 'yes' })
    }
</script>

You won't have to import any modules from the 'vue' package as defineEmits is already there.

To delve deeper into this topic, visit:

Answer 4

Utilizing the script setup syntax provides a convenient way to achieve the following:

<script setup>
    const emit = defineEmits(['close', 'test'])
    
    const handleClose = () => {
        emit('close')
        emit('test', { anything: 'yes' })
    }
</script>

You won't have to import any modules from the 'vue' package as defineEmits is already there.

To delve deeper into this topic, visit:

Answer 5

Answer №3

The composition api enables the usage of the $attrs property that is inherited in each component to fulfill specific requirements.

If you are familiar with using this.$parent.emit because you know that the child will always be part of the same parent, how can you achieve a similar behavior with $attrs?

For instance, imagine a scenario where a table consists of row components and you want to handle row clicks in the table's parent element.

Table Component:

<template>
  <row v-bind="$attrs" ></row>
 </template>

Row Component:

<template name="row" :item="row" @click=onClick(row)>
  Your Row 
</template>

export default {
    emits: {
      row_clicked: () =>{
       return true
      }
   }, 
   onClick(rowData){
     this.$emit('row_clicked',rowData)
  }
}

Lastly, within a component that includes your table definition, you can implement a method to manage the click event.

<table
@row_clicked=clicked() 
>

</table

By applying the @row_clicked directive to the row component in your table, it will respond when the row emits the specified event.

Answer 6

The composition api enables the usage of the $attrs property that is inherited in each component to fulfill specific requirements.

If you are familiar with using this.$parent.emit because you know that the child will always be part of the same parent, how can you achieve a similar behavior with $attrs?

For instance, imagine a scenario where a table consists of row components and you want to handle row clicks in the table's parent element.

Table Component:

<template>
  <row v-bind="$attrs" ></row>
 </template>

Row Component:

<template name="row" :item="row" @click=onClick(row)>
  Your Row 
</template>

export default {
    emits: {
      row_clicked: () =>{
       return true
      }
   }, 
   onClick(rowData){
     this.$emit('row_clicked',rowData)
  }
}

Lastly, within a component that includes your table definition, you can implement a method to manage the click event.

<table
@row_clicked=clicked() 
>

</table

By applying the @row_clicked directive to the row component in your table, it will respond when the row emits the specified event.

Answer 7

Answer №4

One way to achieve this is by utilizing the context parameter passed as the second argument inside the child component, which will be responsible for emitting the event.

setup(props, context){
     context.emit('customEvent')
}

Subsequently, trigger the emission by invoking the context.emit function within the setup method.

To capture this event in the parent component, you can set up a handler like this:

<MyParentComponent @customEvent="handleCustomEvent" />

In the setup method of the MyParentComponent component, define the handler as shown below:

//inside <script> tag of MyParentComponent
setup(props){
    const handleCustomEvent() => {
            // Handle the event here
    }
    return { handleCustomEvent }
}

Answer 8

One way to achieve this is by utilizing the context parameter passed as the second argument inside the child component, which will be responsible for emitting the event.

setup(props, context){
     context.emit('customEvent')
}

Subsequently, trigger the emission by invoking the context.emit function within the setup method.

To capture this event in the parent component, you can set up a handler like this:

<MyParentComponent @customEvent="handleCustomEvent" />

In the setup method of the MyParentComponent component, define the handler as shown below:

//inside <script> tag of MyParentComponent
setup(props){
    const handleCustomEvent() => {
            // Handle the event here
    }
    return { handleCustomEvent }
}

What is the alternative to using this.$parent.$emit in Vue 3?

Answer №1

Answer №2

Answer №3

Answer №4

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