Is it possible for a Vue component to contain both data and props simultaneously?

How does a standard Vue component look?

Vue.component('blog-post', {
  // camelCase in JavaScript
  props: ['postTitle'],
  template: '<h3>{{ postTitle }}</h3>'
})

The basic documentation on components does not use the data object, only props. However, the data documentation mentions components:

Restriction: Only accepts Function when used in a component definition.

They even provide an example:

var data = { a: 1 }

// direct instance creation
var vm = new Vue({
  data: data
})
vm.a // => 1
vm.$data === data // => true

// must use function when in Vue.extend()
var Component = Vue.extend({
  data: function () {
    return { a: 1 }
  }
})

So, can a component have both data and props? Is data like a private property (in OOP terms) and props a public one?

Answer №1

In the realm of components, there exists a duality between props and data. While props are provided by the parent component, data is managed internally by the component itself. Props are like unchangeable constants passed down from parent to child, whereas data is like a dynamic variable that only the component can modify.

When it comes to modifying properties in a child component, the primary method is through emitting events. By emitting an event, the child signals to the parent that a change has occurred and passes along any necessary information in the payload. The parent responds to this event by updating its own data, which then cascades down to update the corresponding child property. This concept is often referred to as one-way data flow.

The one-way-down binding established by props ensures that changes made at the parent level propagate downward to the child component, but not vice versa. This safeguard prevents unintended alterations to the parent's state by child components, thereby maintaining a clear and understandable data flow within your application.

For more details, refer to the Vue documentation.

If you prefer visual aids, here's a simple schema to help illustrate the concept:

https://i.sstatic.net/vHKZH.png

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