How to use vue and Element-plus to filter and sort data

How to use Vue and Element Plus to implement data filtering and sorting

In modern web application development, data filtering and sorting are very common and essential functions. Vue is a popular JavaScript framework that makes building interactive front-end applications simple and elegant. Element Plus is a set of UI component libraries based on Vue, which provides a wealth of customizable components, allowing developers to quickly implement various functions. This article will introduce how to use Vue and Element Plus to filter and sort data.

1. Preparation
First, we need to ensure that Vue and Element Plus have been installed. It can be installed through the following command:

npm install vue
npm install element-plus

Next, we need to create a Vue instance and then introduce Element Plus into the instance. Create a Vue instance named "app" and introduce Element Plus styles and components into the instance:

// main.js
import { createApp } from 'vue';
import ElementPlus from 'element-plus';
import 'element-plus/lib/theme-chalk/index.css';

const app = createApp(App);
app.use(ElementPlus);
app.mount('#app');

2. Data filtering
In Vue, we can use the computed attribute and v-model Instructions to filter data. Suppose we have an array containing multiple user information, and we want to filter based on the user's name. The following is a simple sample code:

<template>
  <div>
    <input v-model="filterName" placeholder="请输入姓名">
    <table>
      <tr v-for="user in filteredUsers" :key="user.id">
        <td>{{ user.name }}</td>
        <td>{{ user.age }}</td>
      </tr>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      users: [
        { id: 1, name: '张三', age: 20 },
        { id: 2, name: '李四', age: 25 },
        { id: 3, name: '王五', age: 30 }
      ],
      filterName: ''
    }
  },
  computed: {
    filteredUsers() {
      return this.users.filter(user => user.name.includes(this.filterName))
    }
  }
}
</script>

In the above code, we create a data attribute named "filterName" to store the filter conditions entered by the user. Then, we use the v-model directive to bind the input box and filterName to achieve two-way data binding. In the computed attribute, we use the filter method to filter the users array and return a new array filteredUsers, which only contains user information whose name contains filterName.

3. Data sorting
In Vue, we can sort data through the sort method of Array. Suppose we have an array containing information about multiple products, and we want to sort them based on their price. The following is a simple sample code:

<template>
  <div>
    <table>
      <tr>
        <th>
          商品名称
          <button @click="sortByName">排序</button>
        </th>
        <th>
          商品价格
          <button @click="sortByPrice">排序</button>
        </th>
      </tr>
      <tr v-for="product in sortedProducts" :key="product.id">
        <td>{{ product.name }}</td>
        <td>{{ product.price }}</td>
      </tr>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: '手机', price: 3000 },
        { id: 2, name: '电视', price: 5000 },
        { id: 3, name: '电脑', price: 8000 }
      ]
    }
  },
  methods: {
    sortByName() {
      this.products.sort((a, b) => (a.name > b.name ? 1 : -1))
    },
    sortByPrice() {
      this.products.sort((a, b) => a.price - b.price)
    }
  },
  computed: {
    sortedProducts() {
      return this.products
    }
  }
}
</script>

In the above code, we created a data attribute named "products" that contains an array of product information. We then iterate over the products array using the v-for directive and return the sorted array to the template using the sortedProducts computed property.

In the template, we trigger the corresponding sorting method by adding a @click event listener to the sorting button. The sortByName method uses sort and comparison functions to sort items by name, and the sortByPrice method uses sort and subtraction operators to sort items by price.

Through the above code example, we can see how to use Vue and Element Plus to filter and sort data. Vue's computed attribute and v-model directive and Array's sort method are key tools for us to complete filtering and sorting functions. Element Plus provides a rich set of UI components, allowing us to quickly build beautiful and highly interactive front-end applications.

Summary
This article introduces how to use Vue and Element Plus to filter and sort data. Through simple sample code, we can see the convenience and flexibility of Vue's computed attribute and v-model directive and Array's sort method in implementing these functions. I hope this article can help readers better understand and use Vue and Element Plus.

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