VUE3 development basics: Use Vue.js plug-in to create form input components

Vue.js is a popular JavaScript framework that provides many development-friendly features and a good development experience. In the new version of Vue.js 3, a series of new features and APIs are provided, allowing developers to develop applications more conveniently. This article will introduce how to use the Vue.js plug-in to create a form input component and help you better understand the development foundation of Vue.js 3.

Vue.js plugin

Vue.js plugin is a reusable code component that can be called and used by Vue.js applications. Plug-ins can provide a series of functions, instructions or filters, etc., which greatly facilitates the work of developers. In Vue.js 3, plug-ins can be registered into the Vue instance using the app.use method, as follows:

app.use(plugin, options)

where, plugin is the plug-in object, options are the plug-in configuration items. The plug-in object must contain the install method to implement the plug-in installation process. In the install method, we can add new global functions to the Vue instance, such as extending the Vue instance prototype, adding global directives or components, etc.

Create a form input component

Now, let’s try to create a form input component using the Vue.js plug-in. Form input components are one of the most commonly used user interface components in web applications and are used to collect and process user input data. Here, we will create a simple text box input component to demonstrate the use of the plug-in.

First, create a Vue.js plugin named VueInputPlugin. The plug-in contains a Vue component named VueInput as an implementation of the form input component. The specific code is as follows:

// 定义VueInputPlugin插件
const VueInputPlugin = {
  install(app) {
    // 注册Vue组件VueInput
    app.component('VueInput', {
      props: {
        value: String // 组件的输入值
      },
      emits: ['input'], // 组件触发的自定义事件
      template: `
        <input
          type="text"
          :value="value"
          @input="$emit('input', $event.target.value)"
        />
      `
    })
  }
}

In the above code, we first define a plug-in object named VueInputPlugin. In the install method, we registered a Vue component named VueInput, which contains a component input value named value and a custom eventinput.

In the component template, we use the input tag to implement text box input, and in the @input event handler function, we launch custom events to the outsideinput, pass the value of the text box as a parameter. In this way, we can bind the input component through the v-model directive to achieve two-way data binding.

Using the form input component

Now, we have created a simple text box input component that can be registered to the Vue instance and used. We can register the plug-in in the Vue instance with the following code:

import { createApp } from 'vue'
import VueInputPlugin from './VueInputPlugin'

const app = createApp({})
app.use(VueInputPlugin)

After registration, we can use the input component in the Vue template. For example, the following code creates a Vue template that contains a textbox input component and a title to display the input value:

<template>
  <div>
    <h1 id="title">{{ title }}</h1>
    <VueInput v-model="inputValue" />
    <p>输入的值为: {{ inputValue }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      title: 'Vue.js 表单输入组件',
      inputValue: ''
    }
  }
}
</script>

In the above code, we use v-model## The # directive bidirectionally binds the input value of the form input component and uses another simple interpolation binding to display the input value.

Summary

In this article, we introduced the development basics of Vue.js 3 and the use of plug-ins, and demonstrated how to use Vue.js plug-ins to create a form input component. The Vue.js plug-in provides the possibility to develop Vue.js applications, allowing developers to implement various functions more conveniently and improve the maintainability and scalability of the application. We recommend that you further learn Vue.js and try to develop richer and more interesting applications.

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