How to use PHP and Vue to implement data recovery function

How to use PHP and Vue to implement data recovery function

Introduction:
In the process of developing Web applications, the data recovery function is a very important characteristic. Using the technology that combines PHP and Vue, you can easily implement data recovery functions and improve user experience. This article will introduce how to use PHP and Vue to implement data recovery functions, and provide specific code examples.

1. What is the data recovery function?
The data recovery function refers to the data recovery function that can restore the user's data if the browser window is accidentally closed or other network instability causes data loss during editing operations. The last edited data. Through the data recovery function, users can continue editing previously unfinished content when reopening the page after closing the browser, avoiding the trouble of re-entering.

2. User interface design
Use Vue on the front end to design the user interface, and save the user's editing content by monitoring the value changes of the input box. Every time the text content changes, the edited content is saved to a variable in real time. This variable can be managed uniformly through Vuex to ensure data consistency.

3. Back-end data storage
Use PHP to process the data passed from the front-end and store the data in the database or other persistent storage methods. After each edit is completed, the data is sent to the backend through an Ajax request for storage. Here we assume that a MySQL database is used to store data.

4. Data recovery logic processing

1. When a user accesses the edit page, first obtain the content of the user's last edit from the database.
2. Assign the obtained content to the edit box in the created life cycle of the Vue component.
3. Monitor the value changes of the edit box and update the user's editing content through Vuex in real time.
4. When the user closes the page or a network exception occurs, the browser's beforeunload event is triggered, and the content currently edited by the user in Vue is stored in the browser's localStorage in JSON format. middle.
5. When the user revisits the editing page, check whether there is saved editing content in localStorage.
6. If it exists, assign the saved content to the edit box and update the user's editing content through Vuex.

5. Specific code examples
PHP code:

<?php
// 连接到数据库，请确保填写正确的数据库信息
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 获取用户上次编辑的内容
$sql = "SELECT content FROM user_data WHERE user_id = 1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        // 返回获取到的内容
        echo $row["content"];
    }
} else {
    // 没有获取到内容，返回空值
    echo "";
}

// 关闭数据库连接
$conn->close();
?>

Vue code:

<template>
  <div>
    <textarea v-model="content" @input="saveContent"></textarea>
  </div>
</template>

<script>
export default {
  data() {
    return {
      content: ''
    }
  },
  methods: {
    saveContent() {
      // 将内容存储到 Vuex 中
      this.$store.commit('saveContent', this.content);
    }
  },
  created() {
    // 通过 Ajax 请求获取之前保存的内容
    this.$http.get('/getPreviousContent')
      .then(response => {
        this.content = response.data;
      });
  },
  beforeDestroy() {
    // 页面关闭时将当前内容保存到 localStorage 中
    localStorage.setItem('previousContent', JSON.stringify(this.content));
  },
  mounted() {
    // 检查 localStorage 中是否有保存的内容
    const previousContent = localStorage.getItem('previousContent');
    if (previousContent) {
      this.content = JSON.parse(previousContent);
    }
  }
}
</script>

6. Summary
Use the technology of combining PHP and Vue , we can easily implement data recovery function. By storing the user's edits in a database and updating them in real time, and by saving the content to the browser's localStorage when the user closes the page, users can continue editing unfinished content when they reopen the page. I hope the content of this article will be helpful to you when implementing the data recovery function.

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