Tips for utilizing props in a Vue component

When trying to incorporate a prop into a computed value, I encounter the following error:

[Vue warn]: Error in render: "TypeError: Cannot read property 'length' of undefined" found in ---> at src/cmps/space-details/space-imgs.vue at src/pages/space-details.vue at src/App.vue

Could it be that I am using the prop incorrectly? Here is the component in question:

<template>
  <div v-if="imgUrls.length" class="space-imgs" :class="pics">
    <img :src="img" v-for="(img, idx) in imgUrls.slice(0, 5)" :key="idx" />
  </div>
</template>

<script>
export default {
  props: { imgUrls: Array },

  computed: {
    pics() {
      return `pics-${this.imgUrls.length}`;
    },
  },
};
</script>

And here's how I'm passing the prop:

    <space-imgs :imgUrls="space.imgUrls" />

Thank you!

Answer №1

Make sure to pass the prop as shown in the code snippet below for it to function correctly.

<space-images :img-urls="space.imgUrls" />

To prevent receiving incorrect prop data within the component, initialize the prop with a default value like this:

props: { 
 imgUrls: {
     type: Array,
     default: [],
     required: true
 } 
}

Answer №2

Before passing the prop, your template is rendered first which can make imgUrls undefined. Ensure to use v-if="imgUrls" to avoid this issue.

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