VUE3 Getting Started Tutorial: Using the Vue.js plug-in to encapsulate the region selector component

VUE3 Getting Started Tutorial: Use the Vue.js plug-in to encapsulate the region selector component

Vue.js is a popular JavaScript framework that can help developers build high-performance, flexible, and easy-to-maintain web applications. program. The latest version of Vue.js, Vue3, brings many new features and improvements, one of the important improvements is its component system. Components are the core of Vue.js, which can help developers achieve efficient code reuse and improve development efficiency. Vue.js plug-in is a reusable code package that encapsulates commonly used functions into pluggable components.

In this article, we will use the Vue.js plug-in to encapsulate a region selector component. This component allows users to easily select province/city/district/county. We will provide the complete code so that developers can easily integrate this component into their applications.

Step 1: Create a Vue.js plug-in

First, we need to create a Vue.js plug-in. Vue.js plug-in is a reusable code package that can contain any reusable code such as global components, directives or mixers. Plug-ins are often used to encapsulate commonly used functionality into pluggable components. Vue.js plug-ins have two parts: the plug-in object and the installation function. The plug-in object is a JavaScript object that contains global components, directives, or mixers; the installation function is a JavaScript function that receives a Vue.js instance as a parameter and registers the plug-in object on the instance.

The following is the Vue.js plugin code we created:

// Define a plugin object
const AreaPickerPlugin = {
    install(app) {
        // Define a global component
        app.component('area-picker', {
            // Add component options
        })
    }
}

// Export the plugin object
export default AreaPickerPlugin

Step 2: Define the region selector component

Next, we will define the style of the region selector component and interaction logic. This component will include four drop-down boxes, corresponding to provinces/cities/districts/counties respectively. Users can select the corresponding regions through these drop-down boxes.

The following is the code for the region selector component we defined:

<template>
  <div class="area-picker">
    <select v-model="selectedProvince" @change="provinceChanged">
      <option value="">请选择省份</option>
      <option v-for="province in provinces" :value="province">{{ province.name }}</option>
    </select>
    <select v-model="selectedCity" @change="cityChanged" :disabled="!cities.length">
      <option value="">请选择城市</option>
      <option v-for="city in cities" :value="city">{{ city.name }}</option>
    </select>
    <select v-model="selectedArea" @change="areaChanged" :disabled="!areas.length">
      <option value="">请选择区县</option>
      <option v-for="area in areas" :value="area">{{ area.name }}</option>
    </select>
    <select v-model="selectedStreet" :disabled="!streets.length">
      <option value="">请选择乡镇街道</option>
      <option v-for="street in streets" :value="street">{{ street.name }}</option>
    </select>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedProvince: '',
      selectedCity: '',
      selectedArea: '',
      selectedStreet: '',
      provinces: [],
      cities: [],
      areas: [],
      streets: [],
    }
  },
  methods: {
    provinceChanged() {
      // Update cities
      // Reset areas, streets
    },
    cityChanged() {
      // Update areas
      // Reset streets
    },
    areaChanged() {
      // Update streets
    },
    loadData() {
      // Load data from API
    }
  },
  mounted() {
    this.loadData();
  }
};
</script>

<style>
.area-picker {
  display: flex;
  flex-wrap: wrap;
}

select {
  margin-right: 10px;
}
</style>

In this component, we use the responsive data of Vue.js to track the province/city/district/selected by the user county. When the user selects a province, we will update the city list; when the user selects a city, we will update the district and county list; when the user selects a district or county, we will update the township and street list. We also define a loadData() method that loads data from the API so that we can populate the list of provinces/cities/districts/counties.

Step 3: Register the region selector component as a plug-in

Finally, in the plug-in’s installation function, we will register the region selector component as a global component.

Here is our code to register the region selector component:

import AreaPicker from './AreaPicker.vue';

const AreaPickerPlugin = {
  // Define the install function
  install(app) {
    // Register the global component
    app.component('area-picker', AreaPicker);
  }
};

export default AreaPickerPlugin;

Now that we have created a Vue.js component and encapsulated it in a plugin, let’s see how to We use it in our application.

Step 4: Use the region selector component

Using the region selector component is simple. We just need to import the Vue.js plugin we just created and use it on the Vue.js instance.

Here is the code to use the region selector component:

<template>
  <div>
    <area-picker />
  </div>
</template>

<script>
import AreaPickerPlugin from './plugins/AreaPickerPlugin';

export default {
  // Install the plugin
  created() {
    this.$use(AreaPickerPlugin);
  },
};
</script>

In this example, we introduce the plugin we just created and use it on the Vue.js instance. We just need to add the area-picker component in the template to use the area picker component in our application.

Conclusion

In this article, we learned how to use the Vue.js plugin to encapsulate a region selector component. We achieve this functionality by creating a Vue.js plugin, defining the region selector component, registering the region selector component as a plugin, and then using it in our application. This example illustrates the power of Vue.js plug-ins, which allow us to encapsulate any commonly used functionality into a reusable code package so that other developers can easily integrate it into their applications.

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