The instance is referencing a property or method (...) that has not been defined, resulting in an error during rendering

"Unrecognized property or method "show" is being referenced in the rendering stage. To resolve this, ensure that the property is reactive by including it in the data option for functional components or initializing it for class-based components."

This block of code belongs to me.

<script>
import { SlideYUpTransition } from 'vue2-transitions'

export default {
  data: () => ({
    listitems: [{
        title: 'Attendance Management',
        path: '/attendanceCheck'
      },
      {
        title: 'Student Administration',
        path: '/studentAdministration'
      },
      {
        title: 'Notification Settings',
        path: '/notificationSetting'
      }
    ],
    components: {
      SlideYUpTransition
    },
    data() {
      return {
        show: true
      }
    }
  })
}
</script>
<style>

/*-- Main Content --*/
/* .content {
  width: 580px;
  padding: 20px;
  margin-bottom: 20px;
  float: left;
} */


@media ( max-width: 480px) {
  .container {
    width: auto;
  }
  .content {
    float: none;
    width: auto;
  }
}
</style>
<template>

  <!-- Main Content ( Image, Notice ) -->
  <div class="main-content">
    <section>
        <v-parallax src="/images/bg.png" height="650"></v-parallax>
    </section>
    <slide-y-up-transition>
      <div v-show="show">Your content goes here</div>
    </slide-y-up-transition>
  </div>
</template>

Answer №1

One common reason for encountering this error is the potential usage of a "model" within the "template" tag without declaring it in the "data" section within the "script" tag.

For Example:

<template>
    <el-form ref="form" :model="form" label-width="120px"> ##<=== form model used here
        <el-form-item label="Name">
            <el-input v-model="form.name"></el-input>
        </el-form-item>
  </el-form>
 </template>

However, the declaration in the "Script" tag may have been overlooked.

export default {

  data: () => ({

      form:{
          name: ''   <----- Declare and initialize here
          }

  }),


  methods:{

  },

  components: {

  }
};

Implementing this adjustment will resolve the issue....

Answer №2

To ensure proper structure of your component, it is important to have data and components as top-level properties:

export default {
  data: () => ({
    items: [
      {
        name: 'Attendance Management',
        path: '/attendanceCheck'
      },
      {
        name: 'Student Administration',
        path: '/studentAdministration'
      },
      {
        name: 'Notification Settings',
        path: '/notificationSetting'
      }
    ],
    visible: true
  }),
  components: {
    SlideYUpTransition
  }
}

data should be a function that returns the component's state, while components should be an object.

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