VUE3 development basics: using Vue.js plug-in to encapsulate object-oriented components

With the continuous development of front-end development technology, Vue.js, as a lightweight Javascript framework, is increasingly favored by developers. In the new version of Vue.js, Vue3, some new features and improvements have been added, such as Composition API and better TypeScript support. This article will focus on how to use the Vue.js plug-in to encapsulate object-oriented components to help beginners get better started with Vue3 development.

What is Vue.js plug-in?

First of all, we need to clarify what a Vue.js plug-in is. The Vue.js plug-in is a reusable Vue instance plug-in that can help us implement some components and auxiliary modules with complex functions. At the same time, these plug-ins can also be encapsulated into a Vue.js component library for easy reuse in different projects. .

Vue.js plug-in consists of a JavaScript object, usually including an install method, which receives the Vue constructor as the first parameter, and optional parameters. Once the plugin is installed, we can use it in any Vue instance.

How to encapsulate object-oriented components?

Next, we will introduce step by step how to encapsulate object-oriented components. We will take a simple button component as an example to illustrate how to use the Vue.js plug-in to encapsulate object-oriented components.

Step 1: Create a component class

We first need to create an object-oriented component class to write the logic code of the button component. Component classes usually include the following parts:

• Constructor: used to initialize some variables and data of the component, as well as set component styles, etc.
• render method: used to render component content, including HTML templates and styles, etc.
• Life cycle hook function: used to handle different life cycle events of components, such as mounted, updated, beforeDestroy, etc.

The following is a sample code for a simple button component class:

class MyButton {
  constructor(options = {}) {
    this.text = options.text || 'Submit';
    this.type = options.type || 'primary';
    this.id = options.id || 'my-button';
  }

  render() {
    const button = document.createElement('button');
    button.setAttribute('id', this.id);
    button.classList.add('btn', `btn-${this.type}`);
    button.textContent = this.text;
    return button;
  }

  mounted() {
    console.log('MyButton mounted');
  }

  beforeDestroy() {
    console.log('MyButton beforeDestroy');
  }
}

Step 2: Create a Vue plug-in

Next, we need to add the button component class Encapsulated into a Vue.js plug-in. We can achieve this using the Vue.extend() method, which receives a component options object and returns a reusable Vue component constructor.

The following is a sample code of how to encapsulate the button component class into a Vue.js plug-in:

const MyButtonPlugin = {
  install(Vue) {
    Vue.prototype.$myButton = Vue.component('my-button', Vue.extend(new MyButton()));
  }
};

In the above sample code, we instantiate the button component class and pass it to Vue.extend () method, and then call the Vue.component() method to create a reusable Vue component constructor. Next, we make the component constructor a property of the Vue instance for use in the component.

Step 3: Use the Vue plug-in

Finally, we can use the custom button component in the Vue application. We only need to call the MyButtonPlugin.install() method in the Vue instance to register the component as a global component. Then, we can use the component in the Vue template.

The following is a sample code of how to use the Vue plug-in to create a custom button component:

const app = createApp({});
app.use(MyButtonPlugin);

app.component('my-button', {
  template: '<div><$myButton></$myButton></div>'
});

app.mount('#app');

In the above sample code, we first create a Vue instance and use the MyButtonPlugin plug-in. Next, we call the app.component() method to create a custom button component and use the component's template to render the component content. Finally, we mount the Vue instance to the specified DOM node.

Summary

Through the above steps, we successfully encapsulated an object-oriented button component into a Vue.js plug-in and registered it as a global component. This component can be reused in Vue applications and can be extended with more functions and styles.

Through this article, we learned how to use the Vue.js plug-in to encapsulate object-oriented components, which is a very important step in Vue3 development. I hope this article can help beginners better understand and get started with Vue3 development.

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