How to use PHP and Vue to implement data filtering function

How to use PHP and Vue to implement data filtering function

In web development, data filtering is a common requirement. This article will introduce how to use PHP and Vue framework to implement a simple data filtering function, and provide specific code examples.

1. HTML structure

First, we need to create an HTML form to enter filter conditions. Suppose we have a table with student information, including the student's name, age, and grades. We can create the following HTML structure:

<div id="app">
  <form>
    <label>姓名:</label>
    <input type="text" v-model="filter.name">
    <br>
    <label>年龄:</label>
    <input type="number" v-model.number="filter.age">
    <br>
    <label>成绩:</label>
    <input type="number" v-model.number="filter.score">
    <br>
    <button type="button" @click="filterStudents">筛选</button>
  </form>
  
  <table>
    <tr>
      <th>姓名</th>
      <th>年龄</th>
      <th>成绩</th>
    </tr>
    <tr v-for="student in filteredStudents">
      <td>{{ student.name }}</td>
      <td>{{ student.age }}</td>
      <td>{{ student.score }}</td>
    </tr>
  </table>
</div>

In the above code, we use Vue's two-way binding function (v-model) to bind the input value to the filter object in the Vue instance. When the button is clicked, the filterStudents method will be called to filter and the filter results will be displayed in the table. Note that the v-for instruction is used in the tr tag to traverse the filteredStudents array and render each student's information.

2. Vue instance

Next, we need to create a Vue instance, obtain student information through Ajax requests, and implement the filtering function. We can write the code for the Vue instance in the following way:

new Vue({
  el: '#app',
  data: {
    students: [], // 学生信息数组
    filter: { // 筛选条件
      name: '',
      age: null,
      score: null
    }
  },
  computed: {
    filteredStudents() { // 根据筛选条件过滤学生信息
      return this.students.filter(student => {
        let nameMatch = student.name.toLowerCase().includes(this.filter.name.toLowerCase());
        let ageMatch = this.filter.age ? student.age === parseInt(this.filter.age) : true;
        let scoreMatch = this.filter.score ? student.score === parseFloat(this.filter.score) : true;
        return nameMatch && ageMatch && scoreMatch;
      });
    }
  },
  methods: {
    filterStudents() { // 筛选学生信息
      // 发送Ajax请求获取学生信息，这里假设数据已经存在
      axios.get('/api/students')
        .then(response => {
          this.students = response.data;
        })
        .catch(error => {
          console.error(error);
        });
    }
  },
  mounted() { // 初始化时获取学生信息
    this.filterStudents();
  }
});

In the above code, we use the computed property of Vue to dynamically filter student information when the filter object changes. The computed attribute filteredStudents will filter based on the conditions in the filter object and only display student information that meets the conditions.

The filterStudents method in the methods attribute uses the axios library to send Ajax requests to obtain student information. This assumes that the data already exists and is displayed in the students array.

In the mounted function, we call the filterStudents method to obtain student information during initialization.

3. PHP backend

Finally, we need to process the Ajax request in the PHP backend and return student information. The following is a simple PHP sample code:

<?php

// 假设我们已有学生信息的数组
$students = [
  ['name' => '张三', 'age' => 18, 'score' => 90],
  ['name' => '李四', 'age' => 20, 'score' => 85],
  ['name' => '王五', 'age' => 19, 'score' => 95]
];

// 处理Ajax请求
if ($_SERVER['REQUEST_METHOD'] === 'GET' && $_SERVER['REQUEST_URI'] === '/api/students') {
  header('Content-Type: application/json');
  echo json_encode($students);
  exit;
}

?>

In the above PHP code, we assume that there is already an array $students of student information. When a GET request is received and the request URI is /api/students, we return the JSON format data of the student information.

So far, we have implemented the function of data filtering using PHP and Vue. By using a Vue instance on the front end to set filter conditions, and processing Ajax requests on the back end to return qualified student information, we can simply implement the data filtering function.

Summary

This article introduces how to use PHP and Vue framework to implement data filtering function, and provides specific code examples. During the implementation process, you need to understand the concepts of Vue's two-way binding and computed properties, as well as the way data is processed on the PHP backend through Ajax requests. This method can be applied to various web development scenarios, and I hope it can help readers better understand and apply front-end and back-end data filtering technologies.

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