Updates to object properties are not appearing in Vue component

Question

Updates to object properties are not appearing in Vue component

I am facing an issue with a Vue component that has a single prop, which is an object. Despite changing a property in this object, it does not reflect the update in the Vue template.

Below is a simplified version of the component:

<template>
  <p>{{ item.quantity }}</p>
</template>

<script>
  export default {
    props: {
      item: {
        required: true,
        type: Object
      }
    }
  }
</script>

Upon using vue-devtools in Google Chrome, I can observe that the quantity property in my item object is indeed getting updated. However, the template continues to render the default value (1).

Do I need to take any additional steps for Vue to watch nested properties or something similar?

javascript vue.js vuejs2

Answer 1

Answer №1

The problem lies in the fact that the component is not programmed to automatically re-render when there are changes in the props. One possible solution is to create a computed property that accesses the prop value and then use this computed property value in your template.

<template>
  <p>{{ quantity }}</p>
</template>

<script>
  export default {
    props: {
      item: {
        required: true,
        type: Object
      }
    },

    computed: {
        quantity: function() {
            return this.item.quantity;
        }
    }
  }
</script>

Answer 2

The problem lies in the fact that the component is not programmed to automatically re-render when there are changes in the props. One possible solution is to create a computed property that accesses the prop value and then use this computed property value in your template.

<template>
  <p>{{ quantity }}</p>
</template>

<script>
  export default {
    props: {
      item: {
        required: true,
        type: Object
      }
    },

    computed: {
        quantity: function() {
            return this.item.quantity;
        }
    }
  }
</script>

Updates to object properties are not appearing in Vue component

Answer №1

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