How to solve the error when clicking delete in php (solution sharing)

When developing using PHP, it is often necessary to implement a click-to-delete function. In this function, after the user clicks the "Delete" button, he or she needs to confirm the operation in the pop-up prompt box to avoid user misoperation. However, when implementing this feature, we sometimes encounter the problem of incorrect prompts when clicking delete, which may lead to misoperation or user confusion.

This article will explain how to solve this problem to ensure that the feature can work properly.

Step one: Check the JavaScript code

When developing using PHP, we usually need to use JavaScript code to implement the function of clicking to delete the prompt box. Therefore, the most initial check is to confirm whether there are errors in the JavaScript code. In the code, we need to use the confirm() function to display the prompt box. If the function is not called correctly, an error message will appear.

The following is a correct JavaScript code example:

<script>
    function deleteConfirm(){
        var res = confirm("您确定要删除吗?");
        if(res == true){
            //执行删除操作
        }
    }
</script>

Note that in the above code, we first define a deleteConfirm() function, which is used to display the prompt box. If the user clicks "OK", then the subsequent code will be executed to perform the deletion operation. If the user clicks "Cancel", no action will be performed.

Step 2: Check the PHP code

If there is no problem with the JavaScript code, then you need to check the PHP code. When developing with PHP, we usually put the deletion operation in a separate PHP file to avoid confusion in the main program. If there is a problem with the PHP code, it may cause error prompts.

The following is a correct PHP code example:

$conn = mysqli_connect("localhost","username","password","database_name");

if (isset($_GET['id'])) {
    $id = $_GET['id'];
    $sql = mysqli_query($conn,"DELETE FROM users WHERE id = $id");
    header("Location: index.php");
}

In the above code, we first establish a MySQL connection named $conn, and then obtain the value of $id through the passed information, Then perform database operation deletion by executing $query. Finally, return to the main interface through the header() function.

It should be noted that the above code is just an example, and the specific operations should be changed appropriately according to your own needs.

Step 3: Check the HTML code

The last step is to make sure there are no errors in the HTML code. In the HTML code, we need to embed JavaScript and PHP code with the HTML text. If there is an error in the HTML code, it may cause an error message.

The following is a general HTML code example:

    
    <title>删除用户</title>
    <script>
        function deleteConfirm(){
            var res = confirm("您确定要删除吗?");
            if(res == true){
                window.location.href = &#39;delete.php?id=<?php if(isset($_GET[&#39;id&#39;])) echo $_GET[&#39;id&#39;]; ?>&#39;;
            }
        }
    </script>


    <button>删除用户</button>    

In the above code, we placed the PHP file that implements the delete operation in the delete.php file, and placed the delete operation in deleteConfirm( ) function. At the same time, call this function in the button to implement the delete operation.

Summary

When implementing the function of clicking to delete prompts, we need to pay attention to the above three steps to ensure that the code is correct. If you encounter an error message, you can troubleshoot the problem one by one, from JavaScript, PHP to HTML, and then to the database. If you check step by step, you can find the problem so that it can be repaired. Most importantly, we need to develop good coding habits to avoid the possibility of errors.

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