Failure of props to synchronize with parent instance information

I'm currently facing an issue with my "Product" component where the data from the parent is not being passed to the child. It seems to be stuck at the default value entered in the main template. The shipping cost should be either free or $2.69 depending on the premium value.

Despite watching VueMastery introduction videos, I am still struggling to understand the issue. Can someone please provide a clear explanation of what the problem might be?

var app = new Vue({
    el: '#app',
    data: {
        premium: false // Changing the value here doesn't seem to have any effect
    }
})

Vue.component('product', {
    props: {
        premium: {
            type: Boolean,
            required: true
        }
    }, 
    template: ``,
    data() {},
    computed: {
        shipping() {
            if(this.premium) {
                return "Free";
            }
            return 2.69;
        }
    }
}

<div id="app">
    <product :premium="true"></product> // Changing this value seems to work..
</div

Any help on this matter would be greatly appreciated.

javascriptvue.jsparent-childparentprop

Answer №1

To ensure the product element in the child component is bound to the data from the parent component.

<div id="app">
 <product :premium="premium"></product>
</div>

Any changes made to data.premium in the parent component will automatically update the child component.

Answer №2

Take a look right here :)

var app = new Vue({
  el: '#app',
  data: {
    premium: true, // You can also change the value here
    shipping: "Free"
  }
})

Vue.component('product', {
  template: '',
  props: {
    premium: {
      type: Boolean,
      required: true
    }
  },
  data() {},
  computed: {
    shipping() {
      if (this.premium) {
        return "Free";
      }
      return 2.69;
    }
  }
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
  <product :premium="premium">{{ premium }} - {{ shipping }}</product>

  <div> {{ premium }} - {{ shipping }}</div>

</div>
<!-- Changing this will also work.. -->

Answer №3

For more information, take a look at the documentation: https://v2.vuejs.org/v2/guide/components-props.html#Passing-a-Boolean

If you're facing a similar scenario, you can experiment with the following approach:

<div id="app">
    <product v-bind:premium="premium"></product>
</div>

Any modification to the value of "premium" will have an impact on the "Product" component.

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