Understanding Vue.js - encountering the error message "property or method is not defined"

Recently, I've come across an issue that seems to be common among many people, but for some reason, I am unable to find a solution despite looking at similar questions.

The problem arises when I use a v-for in a Vue Component and the array value consistently triggers a warning stating that the variable is missing:

[Vue warn]: Property or method "text" is not defined on the instance but referenced during render. It's important to ensure that this property is reactive, either within the data option or by initializing it for class-based components.

To illustrate the issue, I've created a sample on JSFiddle:

<template>
  <section>
    <section :v-for="text in texts">{{text}}</section>
  </section>
</template>

<script lang="ts">
import { Component, Vue } from "vue-property-decorator";

@Component<Map>({
  data() {
    return {
      texts: ["bbbbb", "xxxxx"]
    };
  }
})
export default class Map extends Vue {}
</script>

Upon changing {{text}} to {{texts[0]}} (view it on https://jsfiddle.net/hdm7t60c/3/), I manage to display bbbbb, however, the iteration doesn't function as expected and the error persists.

This particular challenge is just one aspect of a larger problem I am facing, but resolving it might lead me to overall success.

Answer №1

Try eliminating the colon : from the v-for directive, and don't forget to include the key attribute:

<template>
  <section>
    <section v-for="(text,index) in texts" key="index">{{text}}</section>
  </section>
</template>

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