VueJs Lifecycle Hooks

Vue.js is a popular JavaScript framework for building web applications. One of the key features of Vue.js is its ability to manage the lifecycle of a component, from creation to destruction. This is done through the use of lifecycle hooks, which allow developers to specify specific actions that should be taken at different points in the lifecycle of a component. In this article, we will take a closer look at the different lifecycle hooks available in Vue.js and how they can be used to build powerful and efficient applications.

1. The first lifecycle hook we will look at is the beforeCreate hook. This hook is called before the instance is initialized, and it is the first point at which the component's data and methods are available. This is a good place to set up any initial data or perform any other tasks that need to be done before the component is fully initialized.

2. The next lifecycle hook is the created hook. This hook is called after the instance has been initialized and all of its data and methods are available. At this point, the component's template has not yet been compiled and the DOM has not yet been rendered, so any DOM manipulation should be avoided. This is a good place to perform any asynchronous tasks that need to be done before the component is rendered, such as fetching data from an API.

3. The beforeMount hook is called just before the component's template is compiled and rendered to the DOM. At this point, the component's data and methods are available, and the template has been compiled, but the DOM has not yet been updated. This is a good place to perform any final data manipulation or other tasks that need to be done before the component is rendered.

4. The mounted hook is called after the component's template has been compiled and rendered to the DOM. At this point, the component is fully initialized and ready to be interacted with. This is a good place to perform any DOM manipulation or other tasks that need to be done after the component is rendered.

5. The beforeUpdate hook is called just before the component's data is updated and the DOM is re-rendered. This is a good place to perform any tasks that need to be done before the component's data is updated and the DOM is re-rendered, such as checking for changes in the data and updating the component's state accordingly.

6. The updated hook is called after the component's data has been updated and the DOM has been re-rendered. This is a good place to perform any tasks that need to be done after the component's data has been updated and the DOM has been re-rendered, such as updating any DOM elements that may have been affected by the data update.

7. The beforeDestroy hook is called just before the component is destroyed. This is a good place to perform any tasks that need to be done before the component is destroyed, such as canceling any ongoing asynchronous tasks or cleaning up any resources that were created during the component's lifetime.

8. The destroyed hook is called after the component has been destroyed. This is a good place to perform any tasks that need to be done after the component has been destroyed, such as removing any event listeners or cleaning up any remaining resources.

Lifecycle hooks are an important part of building efficient and maintainable applications with Vue.js. By understanding the different hooks available and when they are called, developers can build powerful components that can adapt to changes in data and user interactions in a predictable and efficient manner. Whether you are building a small single-page application or a large-scale web application, the lifecycle hooks provided by Vue.js can help you build a high-quality and maintainable code.