The NonErrorEmittedError message indicates that component lists rendered using v-for must include explicit keys

Upon executing the command gulp --ship, an error message appears in the terminal:

NonErrorEmittedError: (Emitted value instead of an instance of Error) <app-Player-List v-for="player in players">: component lists rendered with v-for should have explicit keys. See https://vuejs.org/guide/list.html#key for more info.
    

In my TeamInfos.vue class, Visual Studio indicates a specific line as erroneous:

<app-Player-List v-for="(player, index) in players" :player="player" :index="index++"></app-Player-List>
    

A hover over this line shows:

[vue/valid-v-for]
    Custom elements in iteration require 'v-bind:key' directives.eslint-plugin-vue
    

I am uncertain about how to resolve this issue. Below is the complete class:

<template>
  <div>
    <!-- Template content -->
  </div>
</template>

<script>
import * as $ from "jquery";
import PlayerList from "./PlayerList.vue";

export default {
    // Component details and methods
};
</script>

<style>
/* Styling rules */
</style>

Answer №1

To properly use the v-for directive, each element needs a unique identifier specified by a key attribute. This key should be based on the variable being iterated over. For example:

<app-Player-List v-for="(player, index) in players" :key="'player-list-'+index"></app-Player-List>

By setting the key as 'player-list-0', 'player-list-1', etc., you can ensure that each app-Player-List is uniquely identified.

The manual iteration of index with :index="index++" is unnecessary and may lead to unexpected behavior. It's best to remove it. Similarly, :player="player" is not required.

So your updated code could look like this:

<app-Player-List v-for="(player, index) in players" :key="'player-list-'+index"></app-Player-List>

Lastly, keep in mind that your v-for will create an app-Player-List for each player within the players array.

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