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Vue js Lifecycle Explained: From Initialization to Destruction

Sunil Kumar
Sunil Kumar
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Vue js Lifecycle Explained: From Initialization to Destruction

Vue js Lifecycle Explained:-  In this article, we will explore the different stages of the Vue.js lifecycle, from initialization all the way to destruction. By understanding the different steps that a Vue instance goes through during its lifecycle, we can make informed decisions about the code and features that we choose to include in our applications.

We will look at how each stage interacts with the other stages and how best to use them to make our applications run more efficiently. We will also explore the tools and services that Vue provides to assist us in managing our applications.

By the end of this article, you will have a better understanding of the Vue.js lifecycle and the options available to help you develop better applications. So get ready to get to know Vue.js and how it can help you create amazing applications!

Introduction to the Vue js Lifecycle: An Overview

Vue Lifecycle Methods (Vue js Computed)– The Vue js Lifecycle is the process by which an application is created, updated, and destroyed. It is composed of several different stages, each with a specific purpose and  vue js methods. These stages include initialization, update, destruction and event handling. During the initialization stage, the application’s components and data are declared and initialized.

The update stage is where the application’s logic is executed and the components are updated. The destruction stage is the final stage, where the application is disposed of and the resources are released. Event handling is the process of capturing and reacting to user events in the application.

Vue js Computed

Setting Up the Vue js Environment (Vue js Lifecycle)

Understanding the Initialization Process: The process of initializing a Vue.js project consists of several steps. These steps include loading the Vue.js library, creating the vue instance, mounting the vue instance onto an HTML element, and loading the components.

Setting Up the Vue.js Environment: To get started with the Vue.js environment, you’ll need to create a new project. This project will include the main Vue instance, any components that you’d like to use, and the HTML element where you’d like the vue instance to be mounted.

Adding Components: Components are what make up the vue instance and are used to provide the functionality of your app. To add components, you’ll need to declare them in the main Vue.js instance. You can also add additional components using the Vue.js CLI or manually in the main Vue.js instance.

Using Data: Data is used to store and manipulate information in a Vue.js app. Data can be declared in the main Vue.js instance and can also be declared in components. When adding data to a component, you’ll need to wrap the data in a function to ensure that it is reactive.

Writing Logic with Directives: Directives allow you to write the logic of your app in the HTML elements of your page. Directives can be used to show and hide elements, to create loops and conditionals, and to bind data to elements.

Creating Reactive Components: Reactive components allow you to create interactive components that will automatically update and respond to changes in the data. To create a reactive component, you’ll need to use the Vue.js reactivity API. This API allows you to listen for data changes and react accordingly.

Creating Event Listeners: Event listeners allow you to set up functions that will be called when certain events occur. These events can be triggered by user actions or by other components or data changes. To set up an event listener, you’ll need to use the Vue.js event listener API.

Adding Styles with CSS: CSS can be used to style your Vue.js app. You can create your own style sheets or use pre-built style sheets with the Vue.js CLI.

Connecting to an API: If you’re creating a web application, you’ll likely need to connect to an API at some point. Vue.js provides a convenient API for making API calls. You can use the API to fetch data and display it in your app.

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The Vue Instance Lifecycle: Creation to Mounting

  1. Creation: The first step of the Vue instance lifecycle is the creation phase. At this point, Vue sets up the reactive data observation and event/watcher system.
  1. BeforeCreate: The beforeCreate hook is invoked synchronously immediately after the instance has been initialized, but before data observation and event/watcher setup.
  1. Created: The created hook is invoked after the instance has been created and is used to run initialization logic that requires data observation and event/watcher setup to have already been applied.
  1. BeforeMount: The beforeMount hook is invoked before the instance’s initial render (and therefore before the DOM is created).
  1. Mounted: The mounted hook is invoked after the instance has been mounted on the DOM. At this point, the instance is fully interactive and operations like data-binding, computed properties and methods, and watchers are active.
  1. BeforeUpdate: The beforeUpdate hook is invoked before the instance’s data is flushed to the DOM.
  1. Updated: The updated hook is invoked after the instance’s data has been flushed to the DOM, allowing the instance to react to its new state.
  1. BeforeDestroy: The beforeDestroy hook is invoked immediately before the instance is destroyed and can be used to clean up any events or state changes that the instance has created.
  1. Destroyed: The destroyed hook is invoked after the instance has been destroyed. At this point, all bindings and event listeners associated with the instance have been removed.

Updating Data: Reacting to Changes in the DOM

Vue Lifecycle Methods (Vue js Computed) – The Vue.js lifecycle provides an efficient way to respond to changes in the DOM. This is done by updating the model’s data whenever an event is triggered. There are several reactive options available for the model’s data, depending on the type of change being made. For example, if the model is changed within the DOM, the view can be updated immediately using the native Vue.js reactive system. When dealing with larger changes, such as adding a new element to the DOM, Vue.js provides the $watch and $set methods. The $watch vue js methods can be used to watch for changes in the model, and then execute a callback whenever the change occurs. The vue js methods can be used to update the model’s data, and then update the view accordingly.

Destruction: Cleaning Up After the Vue Instance – Vue js Computed

Vue Lifecycle Methods – Once the Vue instance has been destroyed, it’s time to clean up any additional resources used during the instance’s lifetime.  This includes any event listeners, child components, watchers, and more.

When the Vue instance is destroyed, the following clean up steps should be taken:

  1. Unbind any event listeners that have been attached to the instance. This includes any event listeners associated with the components rendered by the Vue instance.
  1. Detach any child components that were created by the Vue instance.
  1. Teardown any watchers associated with the Vue instance.
  1. Clear any state associated with the Vue instance.
  1. Unregister any global components that were created by the Vue instance.
  1. Unregister any custom directives that were registered by the Vue instance.
  1. Remove any DOM elements associated with the Vue instance.

These steps are critical for making sure that memory leakage does not occur and that the resources used during the instance’s lifetime are properly disposed of when the instance is destroyed.

Best Practices for Working with the Vue js Lifecycle – Vue js Computed

  1. Prioritize the Use of Hooks: Make sure to think through the order in which you want to use the hooks to make sure everything is executed in the proper order.
  1. Leverage Global Hooks: Vue allows you to use global hooks, like before Create and before Mount, for global setup across all components.
  1. Use the Correct Hook: Make sure you are using the correct hook for that certain part of the lifecycle.
  1. Utilize Component-Level Hooks: Component-level hooks can be used for more specific tasks, such as setting data, creating watchers, and creating computed properties.
  1. Handle Asynchronous Tasks: Asynchronous tasks, like AJAX calls and promises, should be handled with the mounted hook.
  1. Make Use of Updated and Before Updated: Make sure to take advantage of updated and before Updated, which are called when a component is updated or re-rendered.
  1. Utilize Destroyed: Destroyed can be used to clean up any resources used by the component.
  1. Don’t Forget Error Handling: Error handling can be handled with the error Captured hook, which allows you to prevent errors from bubbling up to the parent component.


Vue Lifecycle Methods (Vue js Computed) – In conclusion, the Vue js Lifecycle is an incredibly valuable tool to understand if you are a web developer. The vue js computed, it guides the development process and provides a structure for writing code.

It’s also useful to know what happens during each step and how they all link together, as this helps to improve the overall performance of an application. By taking the time to understand the Lifecycle, you can take full advantage of the powerful features that Vue js provides.

Related Article: Hire a Skilled Vue js Developer for Your Next Project

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