VUE3 basic tutorial: Use Vue.js plug-in to encapsulate the label selector component

As the JavaScript language becomes more and more popular, so does web development. In the past few years, JS frameworks and libraries have become more and more popular, and one of the most popular frameworks is Vue.js. This simple-to-use yet powerful framework has attracted more and more developers, making web development faster and more efficient.

In Vue.js, components are an important part of developing applications. Vue.js allows you to write code in a componentized manner, breaking a complex application into multiple small components, each with its own specific functions and properties. This makes the code easier to maintain and extend, while also improving application performance and reusability.

In this article, we will introduce another core concept of Vue.js: plugins. We will learn how to use the Vue.js plugin to wrap a tag selector component. We'll explore how to write this component, package it as a plugin, and use it in a Vue.js application.

Start writing components

First, let’s write our components. Here we will create a simple tag selector component that the user can use to select a set of tags. We will use some concepts related to Vue.js, such as components, props, methods, etc. If you are not familiar with these concepts, it is recommended to learn the basics of Vue.js first.

We will use Vue CLI to create our Vue.js application. In the command line, run the following command to create a new application:

vue create tag-selector

Next, we will create a component named TagSelector, which contains an input input box and an option list. The user can enter the tag name through the input box and then select the tag from the list of options.

<template>
  <div class="tag-selector">
    <input type="text" v-model="inputValue" v-on:keydown.enter="addTag()" />
    <div class="tags">
      <span class="tag" v-for="(tag, index) in tags" :key="index">
        {{ tag }}
        <button v-on:click="removeTag(index)">x</button>
      </span>
    </div>
  </div>
</template>

<script>
export default {
  name: "TagSelector",
  data() {
    return {
      tags: [],
      inputValue: ""
    };
  },
  methods: {
    addTag() {
      if (this.inputValue && !this.tags.includes(this.inputValue)) {
        this.tags.push(this.inputValue);
        this.inputValue = "";
      }
    },
    removeTag(index) {
      this.tags.splice(index, 1);
    }
  }
};
</script>

<style>
.tag-selector {
  display: flex;
  flex-direction: column;
  width: 300px;
}

input[type="text"] {
  padding: 5px;
  border: none;
  border-bottom: 1px solid grey;
}

.tags {
  margin-top: 10px;
}

.tag {
  display: inline-block;
  padding: 5px;
  border: 1px solid grey;
  border-radius: 5px;
  margin-right: 5px;
}
</style>

This component has an array named tags, which is used to store the tags selected by the user. It also has a variable called inputValue which is used to get input from the user. The addTag and removeTag methods are used to add and remove tags respectively.

Next, we need to encapsulate this component as a plug-in.

Packaging components as plug-ins

In order to encapsulate our components, we need to write a plug-in in it. A Vue.js plugin must be a JavaScript object that contains at least one install method. This method is called during the installation of Vue.js and receives a Vue.js instance as its first argument. In this case, we need to register our component (TagSelector) in the install method.

We also need to use Vue.js’ built-in version checking function to ensure that the plug-in is compatible with the Vue.js version. Finally, we need to package the completed plug-in into a separate JavaScript file for use in our Vue.js application.

The following is our plug-in code:

import TagSelector from "./TagSelector.vue";

const install = function(Vue) {
  Vue.component("tag-selector", TagSelector);
};

export default { install };

// version check
const version = Number(Vue.version.split(".")[0]);

if (version >= 2) {
  // Vue.js v2.x.x
  Vue.use(install);
} else {
  console.error("This plugin only works with Vue.js version 2 or above!");
}

We imported the component we wrote before (./TagSelector.vue) and created an install method to register it. We also performed a version check to ensure that the plugin works with applications compatible with Vue.js v2.0 and above. Finally, we export the entire plugin object so that it can be packaged into a separate file.

Using Plugins

Now we have written our plugin and packaged it into a separate file. We can add this to our Vue.js application and use it to select tags.

First, we need to import this plugin in our Vue.js application. We can get this file from a repository like npm or cdn and add it to our application.

import TagSelectorPlugin from "tag-selector-plugin";
import Vue from "vue";

Vue.use(TagSelectorPlugin);

Now we have imported the plugin into the application. In order to use the plugin, we simply add the following code to our template:

<tag-selector></tag-selector>

This will create a custom element called tag-selector in our application and display it as our Tag selector component. We can interact between this custom element and all the properties and methods defined in our plugin.

Conclusion

In this article, we introduced how to use the Vue.js plugin to encapsulate a simple tag selector component and how to use the plugin in a Vue.js application. Learning to write plugins is a very important part of Vue.js development because it allows developers to easily encapsulate functions and components and use them in multiple applications. I hope this article can help you use Vue.js better!

The above is the detailed content of VUE3 basic tutorial: Use Vue.js plug-in to encapsulate the label selector component. For more information, please follow other related articles on the PHP Chinese website!