What best practice should be followed when designing forms that require dynamic interaction based on user input?

When designing forms that require dynamic interaction based on user input, it is best practice to use AJAX to handle the dynamic updates without refreshing the page. This allows for a smoother user experience and reduces the amount of data that needs to be sent back and forth between the server and the client. 

// HTML form with input field
<form id="dynamicForm">
    <input type="text" id="userInput" name="userInput">
</form>

// jQuery script to handle dynamic interaction based on user input
<script>
    $(document).ready(function(){
        $('#userInput').on('input', function(){
            var userInput = $(this).val();
            
            $.ajax({
                url: 'dynamic_form_handler.php',
                type: 'POST',
                data: { userInput: userInput },
                success: function(response){
                    // Update the form or display the response data
                }
            });
        });
    });
</script>

Keywords

PHP dynamic forms user input AJAX validation

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