Entendiendo el ciclo de vida de los componentes

What is the life cycle of a component in Vue.js?

Vue.js is one of the most popular frameworks for the development of dynamic web interfaces. One of the fundamental concepts that you must master is the life cycle of a component, which determines from its creation to its elimination, along with the actions that we can perform at each stage. Each component goes through a series of phases that are managed by a set of functions known as lifecycle hooks. This helps manage changes to the virtual DOM in an efficient and streamlined manner.

How is a component initialized in Vue.js?

The process starts with the execution of the createApp and mount functions, which create the root instance of Vue.js. During this stage, all the events and lifecycle functions required for each component are initialized. Subsequently, the component is started in a state called beforeCreate. Here, code can be executed that will prepare the ground before component startup, such as variable declaration or initial loading of inspirations.

beforeCreate() { // Code to execute before creating the component}

What happens during component creation?

Once the component enters the created state, the created function is executed. At this point, the full definition of the component is already established, although it is not yet attached to the DOM. This is the ideal point to perform data requests or preparations that do not require direct interaction with the DOM.

created() { // Code that is executed once the component is created // Ideal for downloading data or executing synchronizations}

When and how is a component mounted to the DOM?

The next step in the lifecycle is the mounting of the component to the DOM. Before this event, the beforeMount function will be executed, allowing final adjustments to be made before the component is visible in the document.

beforeMount() { // Code that is executed before mounting the component in the DOM}

After that, the component is finally mounted and the mounted function is fired, allowing us to perform activities that require the component to already be in the DOM, such as manipulation of specific elements or initialization of DOM-based libraries.

mounted() { // Code that executes when the component is mounted // DOM element manipulation}

What happens when the component needs to be updated?

Once mounted, the component is in a reactive state and any change in its data can trigger an update. Prior to this change, beforeUpdate is executed to allow pre-modification adjustments to the DOM.

beforeUpdate() { // Code that is executed before updating the DOM}

After the update, updated is executed, where you can perform post-update operations.

updated() { // Code that runs after a DOM update}

What does the component removal process look like?

When a component needs to be removed, two important functions are executed: beforeUnmount and unmounted. In beforeUnmount, you have the opportunity to clean up resources, close connections or remove any references linked to the component before it disappears completely.

beforeUnmount() { // Code for cleaning up before unmounting the component}

Finally, unmounted marks the time when the component has already been unlinked from the DOM and allows you to notify other components or perform additional cleanup.

unmounted() { // Final code after unmounting the component}

Understanding the component lifecycle in Vue.js will help you build more efficient applications and better structure components. Take advantage of these hooks to maximize control over the interaction and manipulation of your components at critical stages of their lifecycle. Continue exploring how to implement and optimize these processes to take your skills to the next level!