How to implement pop-up prompt in php to confirm deletion of database

In web application development, deletion operation is inevitable because it allows users to delete some data and records. However, this also requires caution and validation from the user. For PHP, it is a common requirement to implement the deletion operation of the confirmation pop-up window. In this article, we will introduce how to implement a database deletion operation with a confirmation pop-up window in PHP.

First, we need to set a primary key in the data table in the database. This is because deletion operations are usually performed based on specific rows or records. Make sure the primary key does not conflict with any other data in the application.

Next, we need to implement a page in the application to display the data to be deleted and any related information. In this page, we can set up a delete button that, when the user clicks it, opens a popup asking the user to confirm if they wish to perform the action.

Pop-up windows can be implemented using JavaScript. Below is a sample JavaScript function that can be triggered when the delete button is clicked.

function confirmDelete(id) {
  if (confirm("您确定要删除记录吗？")) {
    window.location.href = "delete.php?id=" + id;
  }
}

This function checks whether the user wishes to delete the displayed record. If the user clicks the "OK" button, it will redirect the user to a script file (e.g. delete.php), passing the record's ID as a parameter.

In the delete.php file, we can use PHP to actually delete the record. Here, we can first check whether the passed ID value is legal and whether the current user has the right to delete the record. If the check passes, we can perform the delete operation using the following code:

$id = $_GET['id'];
if (is_int($id)) {
  // Check user's permission to delete
  // Connect to database
  includedb.php
  // Execute delete query
  $result = mysqli_query($connection, "DELETE FROM mytable WHERE mytable.id = $id");
  // Check for errors and success of delete operation
  if (!$result) {
    // Display error message to user
  } else {
    // Display success message to user
  }
} else {
  // Display error message to user
}

In this code, we first use $_GET to get the ID value passed to the script and use the is_int() function to check if it is a integer. Next, we can connect to the database and use query statements to delete specific records from the table. If the query is successful, we can show a success message to the user, otherwise we can show them an error message.

Finally, if you want the view to be updated in real time via AJAX when the delete operation occurs instead of refreshing the page, change the JavaScript function to use an AJAX request to send the data to the server:

function confirmDelete(id) {
  if (confirm("您确认要删除这条记录吗？")) {
    $.ajax({
      type: "POST",
      url: "delete.php",
      data: { id: id },
      success: function (response) {
        // Update view with new data
      }
    });
  }
}

In this In the example, we use the $.ajax() function of the jQuery library to send a POST request to the server, and use the data attribute to pass the ID value in the request. If the server successfully performs the delete operation, we can update the view with the data from the response.

When using the delete operation with a confirmation pop-up window, you need to pay attention to the following points:

1. Please ensure that the user understands the content being deleted and confirms the execution of the operation.
2. Make sure your code doesn't delete too much. Some applications may require the user to select specific rows or records to be deleted, otherwise the entire table or all rows in the database may be accidentally deleted.
3. Please ensure that your code implements appropriate security checks and only allows deletion operations by authorized users or administrators.

In summary, this article introduces how to use a database deletion operation with a confirmation pop-up window. This operation can help users be more cautious when deleting data and reduce the chance of users accidentally deleting important data. At the same time, the operation can be implemented through PHP and JavaScript code and can be customized as needed.

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