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>{{ 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.

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