Vue.js caution about "Unnecessary non-emits event listeners" alert for events within RouterView

Question

Vue.js caution about "Unnecessary non-emits event listeners" alert for events within RouterView

Is there a way for me to trigger events from my child components and have them reach the top-level App.vue component even though I am using a RouterView to render the child components in the App.vue template?

<template>
    <Navbar />
    <component :is="$route.meta.layout || 'div'">
        <RouterView @display-modal="handleDisplayModal" />
    </component>
</template>

Vue is warning me about non-emits event listeners being passed to the component due to the use of RouterView:

[Vue warn]: Extraneous non-emits event listeners (displayModal) were passed to component but could not be automatically inherited because component renders fragment or text root nodes. If the listener is intended to be a component custom event listener only, declare it using the "emits" option. 
  at <Home onDisplayModal=fn<handleDisplaymodal> onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< undefined > > 
  at <RouterView onDisplayModal=fn<handleDisplaymodal> > 
  at <LayoutBoxed> 
  at <App>

Since RouterView is not my component, I cannot declare the event with "emits." How can I resolve this warning without having to modify all the views rendered by router-view both now and in the future?

My versions:

vue: 3.2.47
vue-router: 4.1.6

javascript vue.js

Answer 1

Answer №1

By setting inheritAttrs: false, the issue with Home ignoring passed attributes seems to be resolved

<template>
  <h2>Hello world</h2>
  <RouterLink to="/Another">Link to Another</RouterLink>
</template>
<script>
// Utilize standard <script> to define options
export default {
  inheritAttrs: false,
};
</script>

For more information, refer to this VueJS warning when using dynamic components and custom events

Answer 2

By setting inheritAttrs: false, the issue with Home ignoring passed attributes seems to be resolved

<template>
  <h2>Hello world</h2>
  <RouterLink to="/Another">Link to Another</RouterLink>
</template>
<script>
// Utilize standard <script> to define options
export default {
  inheritAttrs: false,
};
</script>

For more information, refer to this VueJS warning when using dynamic components and custom events

Answer 3

Answer №2

This handy warning is a heads-up for developers who might encounter components with multiple root nodes lacking automatic attribute fallthrough behavior. Don't fret if you're already familiar with this - you can safely disregard it. Your component will continue to function without any hiccups, regardless of this warning.

If you do wish to eliminate the warning, you have two alternative pathways:

Option 1: Include inheritAttrs:false in the problematic component. This informs Vue that attribute fallthrough should not be utilized in that specific component. It may seem a bit wordy and counterintuitive, but this is often the compromise when working with frameworks/libraries. Certain features may not be essential to you, but they can greatly assist other developers.

Option 2: Craft a warning handler to manually filter out the warning messages.

  app.config.warnHandler = function (msg, vm, trace) {
    if (msg.includes('Extraneous non-emits event listeners (displayModal)')) {
      return
    }
    console.warn(msg, trace)
  }

Answer 4

This handy warning is a heads-up for developers who might encounter components with multiple root nodes lacking automatic attribute fallthrough behavior. Don't fret if you're already familiar with this - you can safely disregard it. Your component will continue to function without any hiccups, regardless of this warning.

If you do wish to eliminate the warning, you have two alternative pathways:

Option 1: Include inheritAttrs:false in the problematic component. This informs Vue that attribute fallthrough should not be utilized in that specific component. It may seem a bit wordy and counterintuitive, but this is often the compromise when working with frameworks/libraries. Certain features may not be essential to you, but they can greatly assist other developers.

Option 2: Craft a warning handler to manually filter out the warning messages.

  app.config.warnHandler = function (msg, vm, trace) {
    if (msg.includes('Extraneous non-emits event listeners (displayModal)')) {
      return
    }
    console.warn(msg, trace)
  }

Answer 5

Answer №3

It appears that there is no specific version information provided for router-view, leading me to assume that you are utilizing vue-router@4:

Given that the render component of router-view is assumed to be null, it essentially represents the parent element of the routes. Therefore, you can utilize the component tag:

<router-view v-slot='{ Component }'>
    <component :is='Component' @display-modal='handle' />
</router-view>

Additionally, I suggest utilizing an event bus instead of implementing complex logic.

Answer 6

It appears that there is no specific version information provided for router-view, leading me to assume that you are utilizing vue-router@4:

Given that the render component of router-view is assumed to be null, it essentially represents the parent element of the routes. Therefore, you can utilize the component tag:

<router-view v-slot='{ Component }'>
    <component :is='Component' @display-modal='handle' />
</router-view>

Additionally, I suggest utilizing an event bus instead of implementing complex logic.

Vue.js caution about "Unnecessary non-emits event listeners" alert for events within RouterView

Answer №1

Answer №2

Answer №3

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