VUE3 basic tutorial: Using Vue.js filters to process table data

Vue.js is a very popular JavaScript framework that can help us build high-performance, maintainable web applications. In Vue.js, filters are a very useful tool for working with data, especially when working with tabular data. This article will introduce how to use Vue.js filters to process tabular data.

1. Overview of Vue.js filters

Filters are a way of data processing that allow us to convert input data into the required output format. In Vue.js, filters are global functions or Vue instance functions that can be used in templates when data needs to be transformed.

There are two types of Vue.js filters: global filters and local filters. Global filters can be used globally, local filters can only be used within a Vue instance.

2. Use Vue.js filter to process table data

Suppose we have a table containing user data, which includes user name, email address and registration date. We want to format the registration date and sort the table by registration date.

First, define a global filter dateFilter in the Vue instance:

Vue.filter('dateFilter', function(value) {
  if (!value) return ''
  return moment(value).format('YYYY/MM/DD')
})

In the above code, we use the moment.js library to convert the date string into a date object and use format () method formats it into 'YYYY/MM/DD' format.

Next, use the filter in the template of the table:

<table>
  <thead>
    <tr>
      <th>用户名</th>
      <th>邮箱</th>
      <th @click="sortTable('registerDate')">注册日期</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="user in sortedUsers">
      <td>{{ user.name }}</td>
      <td>{{ user.email }}</td>
      <td>{{ user.registerDate | dateFilter }}</td>
    </tr>
  </tbody>
</table>

In the above code, we use the pipe character '|' to pass the user's registerDate field to the dateFilter filter. Vue will automatically call the dateFilter function, passing registerDate as a parameter.

Note that when using filters in templates, the processing order of filters may affect the results. In the above code, we first sort the table by registration date (sortedUsers) and then format the date.

Next, we need to implement the sortTable() method. This method sorts the table based on the clicked header title.

sortTable(column) {
  if (this.sortColumn === column) {
    this.sortOrder = this.sortOrder * -1
  } else {
    this.sortColumn = column
    this.sortOrder = 1
  }
  this.users.sort((a, b) => {
    let x = a[column]
    let y = b[column]
    if (column === 'registerDate') {
      x = moment(x)
      y = moment(y)
    }
    if (x < y) {
      return -1 * this.sortOrder
    } else if (x > y) {
      return 1 * this.sortOrder
    } else {
      return 0
    }
  })
}

In the above code, we use the sort() method to sort the table. If the column name is 'registerDate', we convert the date string to a date object and sort by the date object.

Finally, we need to define users data in the Vue instance and load user data in the created() function.

data: {
  users: [],
  sortColumn: '',
  sortOrder: 1
},
created() {
  axios.get('/api/users').then(response => {
    this.users = response.data
  })
}

In the above code, we are using Axios to load user data from the backend server.

3. Summary

Vue.js filter is a very useful tool that can help us process various types of data. In this article, we covered how to use Vue.js filters to process tabular data. We define a global filter that converts the date string into a specified format and use this filter to convert the user's registration date data. In addition, we also introduced how to implement the sorting function of the table. Through studying this article, I believe you have understood the basic usage of Vue.js filters, and I hope it will be helpful to your future development work.

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