Mastering Vue 3 with the Composition API: Hooks and Refs
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Chapter 1: Introduction to Vue 3 and the Composition API
The Composition API in Vue 3 allows developers to extract logic with ease, eliminating the need to manage the context of this throughout the code. This approach not only simplifies the coding process but also enhances compatibility with TypeScript, as it removes the necessity of typing this.
Section 1.1: Understanding Lifecycle Hooks
Lifecycle hooks are integral to Vue 3's Composition API and are organized within the setup method. Below is an example of how they can be utilized:
We can pass callbacks to the lifecycle functions directly. The traditional hooks beforeCreate and created are replaced by the setup method. Here’s a comparison of the options API hooks with their Composition API counterparts:
- beforeMount -> onBeforeMount
- mounted -> onMounted
- beforeUpdate -> onBeforeUpdate
- updated -> onUpdated
- beforeDestroy -> onBeforeUnmount
- destroyed -> onUnmounted
- activated -> onActivated
- deactivated -> onDeactivated
- errorCaptured -> onErrorCaptured
Additionally, the Composition API introduces two debugging hooks: onRenderTracked and onRenderTriggered. For example:
export default {
onRenderTriggered(e) {
debugger;}
}
This code snippet allows you to identify which dependency is prompting the component to re-render.
Section 1.2: Dependency Injection in Vue 3
Dependency injection can be efficiently implemented using the provide and inject functions. This method parallels the provide and inject features from Vue 2.x. Consider the following structure:
In the Ancestor component, you call provide to pass the dependency identified by ThemeSymbol down to the App component. In the App's setup method, you can retrieve this data by invoking inject with ThemeSymbol. If no value is provided, 'light' serves as the default.
Subsection 1.2.1: Utilizing Template Refs
The Composition API also facilitates access to template refs. You create a ref using the ref function and assign it to a specific element or component within your template. For example:
const root = ref(null);
You can then bind this ref in the template. When using render functions, you would write:
h('div', { ref: root });
This effectively assigns the ref to the div created within the h function.
Chapter 2: Enhancing Your Vue 3 Application
In this video tutorial, we explore Vue 3's Composition API, focusing on lifecycle hooks and how to effectively implement them in your applications.
This video dives into managing lists, teleporting elements, and more advanced features of the Composition API in Vue 3.
In conclusion, integrating lifecycle hooks and refs into your Vue 3 applications using the Composition API is straightforward. For further insights, visit plainenglish.io.