How to add data information and synchronize database with jquery

With the popularity of the Internet and the continuous expansion of data applications, the demand for data storage and processing is also increasing. The jquery framework in front-end development can simplify interface interactions and achieve rapid development. For data addition, deletion, modification and database synchronization, jquery also provides some convenient operation methods.

1. jquery and ajax technology

jquery is a lightweight and efficient JavaScript library. It provides a rich and practical API and brings us a fast development experience. The most outstanding thing about jquery is that it integrates ajax technology and provides a very convenient data interaction solution.

Through ajax technology, we can asynchronously request data from the server without refreshing the entire page, and display the data returned by the server on the page. Ajax technology can also be used when data needs to be sent to the server. For example, if we need to submit the data in the form to the server, we can asynchronously submit the form data to the server through ajax technology, and display the submission results in real time on the page.

2. jquery’s DOM operation

jquery also provides a DOM operation API, which allows us to easily operate DOM elements to modify the page content. For example, we can use jquery's selector to select the DOM element that needs to be operated and perform various operations on it.

In terms of data storage, jquery can use the web storage technology provided in HTML5 to store data on the client without requesting data from the server every time. HTML5 provides two storage methods, namely localStorage and sessionStorage.

localStorage can still save data after the user closes the browser. SessionStorage only saves data in the current session, and the data is automatically cleared when the user closes the browser.

3. jquery synchronization database

If you need to synchronize the data stored on the client side to the server-side database, jquery provides ajax request and background processing operation methods. We can use ajax to submit a form filled with data to the server for processing. At the same time, PHP and other back-end languages ​​also provide database operation functions, which can store submitted form data in the server-side database.

The following is an example of sending form data to the server through jquery's ajax technology and storing the data in the database.

$.ajax({
    type: "POST",
    url: "add_data.php",
    data: $("#form").serialize(),
    success: function(result){
        //处理成功后的操作
    },
    error: function(result){
        //处理失败后的操作
    }
});

Among them, type represents the request type, url is the requested address, data is the form data, success and error are the callback functions after the request succeeds and fails. In background processing, you can use PHP's mysqli connection method to perform database operations and store submitted form data in the database. The code is as follows:

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "INSERT INTO data (name,age) VALUES ('$name','$age')";

if ($conn->query($sql) === TRUE) {
    echo "数据已成功存储到数据库中";
} else {
    echo "数据存储失败: " . $conn->error;
}

$conn->close();

Through the above steps, the data stored on the client can be synchronized to the server-side database.

Summary

As a lightweight JavaScript library in front-end development, jquery provides very convenient DOM operations and ajax technology, which can realize data interaction without refreshing the entire page. . At the same time, jquery can also be combined with web storage technology to store data on the client to improve user experience.

For the need to synchronize data to the server-side database, jquery also provides a simple method, using ajax to send form data to the server, and the server-side then uses the corresponding database operation function to store the data in the database.

In front-end development, after learning the relevant operations of jquery, you can greatly improve development efficiency and achieve the goal of optimizing user experience.

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