What are the potential pitfalls of using JavaScript to make dropdown fields dependent on each other in PHP?

One potential pitfall of using JavaScript to make dropdown fields dependent on each other in PHP is that the user can disable JavaScript, rendering the functionality useless. To solve this issue, you can implement the dropdown field dependency logic in PHP to ensure that it works regardless of whether JavaScript is enabled or not. 

<select name="category" id="category">
    <option value="1">Category 1</option>
    <option value="2">Category 2</option>
</select>

<select name="sub_category" id="sub_category">
    <?php
    if ($_POST['category'] == 1) {
        echo '<option value="1">Sub Category 1</option>';
    } elseif ($_POST['category'] == 2) {
        echo '<option value="2">Sub Category 2</option>';
    }
    ?>
</select>

Keywords

JavaScript dropdown fields dependent PHP pitfalls

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