How can I pass data to nested components from Vue instance

Question

I get my data via AJAX from the Vue instance, and I need to pass that data to the components. I am now learning how Vue.js works, but I find the documentation a little fragmentary...

Here is aproximately my code:

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <title>mysite</title>
</head>
<body>

<div id="app">
    <parent-component></parent-component>
</div>

<template id="parent-component-template">
    <div id="the-template">
        <div class="the-list">
            <span is="sector-item" v-for="item in sectors" :sector="item"></span>
        </div>
        <button>Button</button>
    </div>
</template>

<template id="sector-item-template">
    <span>
        {{ sector.name }}
    </span>
</template>

<!-- Vue.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.js"></script>

<script>
    Vue.component('parent-component', {
        template: '#parent-component-template'
    });

    Vue.component('sector-item', {
        props: ['sector'],
        template: '#sector-item-template'  
    });

    let app = new Vue({
        el: '#app',
        data: {
            sectors: [{
                'id': 1,
                'name': 'Industry'
            }]
        }
    });
</script>

</body>
</html>

I get the following error:

[Vue warn]: Property or method "sectors" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option.

Where do I make a mistake?

You need to pass sectors as a prop to your parent component — thanksd
– thanksd, Commented Aug 24, 2017 at 14:57

Ian Rodrigues · Accepted Answer · 2017-08-24 15:34:35Z

I think your code is not complete. I tried to simulate what you trying to, in the snippet bellow:

Vue.component('parent-component', {
  props: ['sectors']
});

Vue.component('child-component', {
  props: ['item']
});

new Vue({
  el: '#app',
  data: {
    sectors: [
      {
        'id': 1,
        'name': 'Industry'
      },
      {
        'id': 2,
        'name': 'Education'
      }
    ]
  }
});

.the-list > div {
  padding: 5px;
  border: 1px solid gray;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.js"></script>

<div id="app">
  <parent-component :sectors="sectors" inline-template>
    
    <div class="the-list">
      <child-component :item="sector" :key="sector.id" v-for="sector in sectors" inline-template>
        <div>
          <span v-text="item.name"></span>
          <button>Button</button>
        </div>
      </child-component>
    </div>
    
  </parent-component>
</div>

The Vue instance owns the property sectors and I passed this property as a prop to the <parent-component>.

Now <parent-component> has a prop called sectors(it could be another name) that received the value of sectors from the main Vue instance. I've used v-for to iterate over all items of the parent-component prop passing each item of the array to the <child-component>.

The <child-component> has a prop called item in which I passed the value of each element of the array.

You can learn more, here for free.

I hope this answer can be helpful.

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