What are some alternative approaches to creating dynamic selection boxes with multiple levels in PHP?

When creating dynamic selection boxes with multiple levels in PHP, one approach is to use AJAX to fetch data based on the user's selection. This allows for a smoother user experience as only relevant data is loaded dynamically. 

// HTML code for the selection boxes
<select id="level1"></select>
<select id="level2"></select>
<select id="level3"></select>

// AJAX script to fetch data based on selection
<script>
$(document).ready(function(){
    $('#level1').change(function(){
        var level1_val = $(this).val();
        $.ajax({
            url: 'fetch_data.php',
            type: 'post',
            data: {level1: level1_val},
            success: function(response){
                $('#level2').html(response);
            }
        });
    });

    $('#level2').change(function(){
        var level2_val = $(this).val();
        $.ajax({
            url: 'fetch_data.php',
            type: 'post',
            data: {level2: level2_val},
            success: function(response){
                $('#level3').html(response);
            }
        });
    });
});
</script>

// PHP code in fetch_data.php to fetch data based on selection
<?php
if(isset($_POST['level1'])){
    $level1 = $_POST['level1'];
    // Fetch data for level 2 based on level 1 selection
    // Return options for level 2
}

if(isset($_POST['level2'])){
    $level2 = $_POST['level2'];
    // Fetch data for level 3 based on level 2 selection
    // Return options for level 3
}
?>

Keywords

PHP dynamic selection boxes multiple levels alternative approaches hierarchical data.

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