Vue 3 — Vue Instance Properties and Templates

Vue 3 — Vue Instance Properties and Templates

Vue lifecycle hooks and interpolation. The Vue instance has some properties that are built into th app. The $data property has the data that our Vue instance has. For instance, we can ...

Vue 3 is in beta and it’s subject to change.

Vue 3 is the up and coming version of Vue front end framework.

It builds on the popularity and ease of use of Vue 2.

In this article, we’ll look at Vue instance hooks and create simple templates with Vue 3.

Vue Instance Properties

The Vue instance has some properties that are built into th app.

The $data property has the data that our Vue instance has.

For instance, we can write:

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>App</title>
    <script src="https://unpkg.com/[email protected]"></script>
  </head>
  <body>
    <div id="app">
      {{a}}
    </div>
    <script>
      const data = { a: 1 };
      const vm = Vue.createApp({
        data() {
          return data;
        }
      }).mount("#app");
      console.log(vm.$data.a);
    </script>
  </body>
</html>

We have the vm.$data.a property which is the same as what we return in the data method.

a would be 1.

Instance Lifecycle Hooks

A Vue instance has various lifecycle hooks that it goes through from the initial load to being destroyed.

The following is the lifecycle diagram:

Image for post

Image for post

Courtesy of https://v3.vuejs.org/guide/instance.html#lifecycle-diagram

When the Vue instance is created, it starts with the init events and lifecycle stage, which calls the beforeCreate method in the Vue instance.

Event listeners are attached and the lifecycle begins at this stage.

Then it initializes the injections and reactivity stage and calls the created method.

This stage is where Vue starts listening for changes for data changes in the Vue instance.

Then one of 2 things can happen depending on if there’s a template in our Vue instance.

If there is, then template is compiled.

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