Discuss how to use jQuery to implement an AJAX delete function

With the development of the Internet, the work of front-end engineers has become smaller and smaller, using various technologies to make the interaction of the website smoother. Among them, the jQuery library is a good helper for front-end engineers. It provides rich functions, such as page operations, dynamic effect display, etc. In this article, we will explore how to implement an AJAX delete function using jQuery.

The concept of AJAX

AJAX (Asynchronous JavaScript and XML) is a technology that communicates with the server to update web pages without reloading the page. In layman's terms, it allows the page to update data without reloading the entire page, and the data can also be interacted with in JSON format. Therefore, the emergence of AJAX technology can make the website experience smoother and enable users to better interact with the website.

Use jquery to implement AJAX deletion

Below, we use a simple example to explain how to use jQuery to implement AJAX deletion.

HTML structure:

<ul id="list">
  <li id="1">List item 1</li>
  <li id="2">List item 2</li>
  <li id="3">List item 3</li>
  <li id="4">List item 4</li>
</ul>

In the ul list, we set 4 li elements, each element is set with a unique id attribute. We will use this as a basis to show how to implement AJAX deletion using jQuery.

First, we need to listen to the click event of the delete button and obtain the data information we need to delete through the id.

$(document).on('click', '.delete-button', function(){
  var id = $(this).parent().attr('id');
});

In the above code, we use the on method to add a click event to the delete button. We can use this to get the information of the currently clicked button, and use the parent method to get the information of the li element where the button is located. Then get the id attribute information of the element.

Next, we use AJAX technology to send the obtained data information to the backend for deletion operation.

$(document).on('click', '.delete-button', function(){
  var id = $(this).parent().attr('id');
  $.ajax({
    url: 'delete.php',
    type: 'POST',
    data: {id: id},
    success: function(response){
      console.log(response);
    }
  });
});

In the above code, we use the ajax method to send a POST request to the delete.php page, and send the obtained id value as data.

Finally, we need to write the code for the delete operation in the backend. The following code is a simple example.

$id = $_POST['id'];
mysql_query("DELETE FROM table_name WHERE id='$id'");
echo "success";

In the above code, we first obtain the id value sent by AJAX, and use the mysql_query method to delete the data information corresponding to the id, and finally return a success string to indicate that the operation is successful.

Summary

Through the above code, we can see that it is not difficult to use jQuery to implement the AJAX deletion function. It only requires certain front-end and back-end development experience, plus sufficient time and With patience, we can make a smooth AJAX deletion function. For example, we can implement the deletion function of the message wall by using the above method.

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