How to implement table sorting and paging functions in Vue documents

Vue is a popular JavaScript framework often used to develop single page applications (SPA). When we need to display a large amount of data in a Vue application, we usually use tables to present the data. Sorting and pagination of tables is very important to make it easier for users to browse the data. This article will introduce how to use table sorting and paging functions in Vue applications.

1. Implement table sorting

First, we need to introduce a JavaScript library named "lodash" into the Vue application. Lodash is a very useful tool library that provides many practical functions that can greatly simplify our development work.

Next, in the "data" option of the Vue component, define an array to store the data we want to present. We also need to define a property for sorting, such as "sortKey" and "reverse", and set their default values ​​to "name" and "false" respectively.

data() {
  return {
    items: [
      { name: 'John', age: 20 },
      { name: 'Bob', age: 25 },
      { name: 'Alice', age: 30 },
      { name: 'Peter', age: 35 }
    ],
    sortKey: 'name',
    reverse: false
  }
},

Next, we need to define a click event for each column in the header so that users can sort by column by clicking on the header. First, we need to define a method "sortBy" which will be used to sort the data. In this method, we need to first store the field to be sorted in the "sortKey" attribute, and then sort based on the state of the "reverse" attribute.

methods: {
  sortBy(key) {
    this.sortKey = key;
    this.reverse = !this.reverse;
    this.items.sort((a, b) => {
      let modifier = 1;
      if (this.reverse) modifier = -1;
      if (a[this.sortKey] < b[this.sortKey]) return -1 * modifier;
      if (a[this.sortKey] > b[this.sortKey]) return 1 * modifier;
      return 0;
    });
  }
},

Finally, we need to use the v-on directive to bind the click event and call the sortBy method in each column of the table header.

<th v-on:click="sortBy('name')">Name</th>
<th v-on:click="sortBy('age')">Age</th>

2. Implement table paging

When we need to present a large amount of data, displaying all the data in one table may cause the page to scroll slowly. Therefore, we need to split the data into multiple pages and display them separately. Here's how to implement paging.

In the "data" option of the Vue component, we need to define a "currentPage" property to track the currently displayed page. And define a "pageSize" attribute to define the number of items each page contains.

data() {
  return {
    items: [
      { name: 'John', age: 20 },
      { name: 'Bob', age: 25 },
      { name: 'Alice', age: 30 },
      { name: 'Peter', age: 35 }
    ],
    currentPage: 1,
    pageSize: 2
  }
},

Next, we need to define a computed property that will return the subset of items required for the current page.

computed: {
  displayedItems() {
    let start = (this.currentPage - 1) * this.pageSize;
    let end = start + this.pageSize;
    return this.items.slice(start, end);
  }
},

Finally, we need to add a paging component to the Vue template. We can use Vuetify, Bootstrap or custom CSS to create paging components. Here we take custom CSS as an example.

<ul class="pagination">
  <li v-bind:class="{ disabled: currentPage === 1 }" v-on:click="currentPage--">
    <a>Previous</a>
  </li>
  <li v-for="pageNumber in pages" v-bind:class="{ active: currentPage === pageNumber }" v-on:click="currentPage = pageNumber">
    <a>{{ pageNumber }}</a>
  </li>
  <li v-bind:class="{ disabled: currentPage === pageCount }" v-on:click="currentPage++">
    <a>Next</a>
  </li>
</ul>

In the Vue component, we need to define two new calculated properties. "pageCount" calculates the total number of pages, and "pages" calculates the array used to render page numbers in a loop.

computed: {
  pageCount() {
    return Math.ceil(this.items.length / this.pageSize);
  },
  pages() {
    let pagesArray = [];
    for (let i = 1; i <= this.pageCount; i++) {
      pagesArray.push(i);
    }
    return pagesArray;
  }
},

In this way, we have completed the implementation of table paging. When we click on a page number in the pagination component, the "currentPage" property is updated accordingly and the computed property "displayedItems" is used to display the items required for the current page number. In short, it is not difficult to implement table sorting and paging in Vue, and it can be easily accomplished using the above method.

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