Vue3 Created

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Modified5 months ago. I'm using Vue3 with TypeScript, the vue-property-decorator and vue-class-component package.

I want to create global service class with vue provide.

In theory, I will provide global service in main.ts, where I create my Vue instance.

An In-Depth Look at Each Lifecycle Hook

What is my expected result:. Expect to see the function being call from the login.vue.

What is my current result:. Error: 'Property 'authService' has no initializer and is not definitely assigned in the constructor.'


Please advice is that my current setup got any problem. ** UPDATE:I changed type of property authService from AuthService to any in Login.vue. But I really want to define a type of authService like authService: AuthService in component Login.vue.

Creating the Application with Vue CLI

How can I do that? ** Solution:I found a [email protected]('authService') private authService = new AuthService().

Dzung TranDzung Tran.

The steps in Vue lifecycle are beforCreate, created, beforeMount, mounted, beforeUpdate, updated, beforeDestroy, destroyed. If the Vue instance is created created () hook allows you to add code to be run.

  • Let’s look at the differences.
  • Reactive data can be accessed when the processing of the options is finished and you can also change them if you want.
  • You cannot do any DOM manipulations because DOM has not been mounted at this stage.
  • created is called earlier in order to trigger actions like data fetching from API backend.
  • Created will not wait for all of the async operations to complete before moving on to the next stage when making API call.
  • An example for created:.
  • Mounted is the most-often used hook in the lifecycle.
  • mounted() is called after DOM has been mounted so you can access the reactive component, templates, and DOM elements and manipulate them.
  • In Server Side Rendering created()is used over mounted() because mounted() is not present in it.

An example for mounted hook:.

Vue 3 Debug Hooks

Vue 3 comes with the Composition API built-in. It lets us extract logic easily an not have to worry about the value of this in our code.

  • It also works better with TypeScript because the value of this no longer has to be typed.
  • In this article, we’ll look at how to create Vue 3 apps with the Composition API.
  • We can create a basic app by defining reactive properties and using them in templates.
  • For instance, we can write:.
  • We define the count reactive property with the ref function.
  • 0 is its initial value.
  • And we add the increment function to update its value.
  • It’s updated differently than in the options API.
  • We’ve to update the value property to update a reactive property with primitive values.

Destruction Hooks – Cleaning Things Up

Then we return both count and increment so we can use them our template.

  • setup is a method that runs when we mount the component.
  • We can define object valued reactive properties with the reactive function.

To do this, we write:. We call reactive with an initial object value.

List Rendering

Then we assign it to the state reactive property.

In the increment function, we update the state.count property to update its value.

And we return state and count so we can use them in the template. To create a computed property, we can use the computed function.

To do this, we write:.

We pass a callback into the computed method to return the value we want for the computed property.