What are the potential pitfalls of relying on JavaScript for form validation, considering that many users may have it disabled?

Potential pitfalls of relying on JavaScript for form validation include the fact that many users may have it disabled, rendering the validation ineffective. To ensure that form validation works for all users, it is important to implement server-side validation using a language like PHP. This way, validation occurs on the server before processing the form data, regardless of the user's JavaScript settings. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Perform server-side validation here
    if (empty($_POST["username"])) {
        $usernameErr = "Username is required";
    } else {
        $username = test_input($_POST["username"]);
        // Additional validation logic
    }
    
    // Repeat for other form fields
    
    // If all validation passes, process the form data
}
?>

Keywords

JavaScript form validation disabled alternative server-side validation

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