Display subcategories in dropdown

You can use a similar block of code to display the categories in a dropdown. I have picked the following example from WordPress codex article on get_categories():

<select name="event-dropdown" onchange="document.location.href=this.options[this.selectedIndex].value;"> 
    <option value=""><?php echo esc_attr(__('Select Event')); ?></option> 
    <?php 
    $categories = get_categories('child_of=10'); 
    foreach ($categories as $category) {
        $option = '<option value="/category/blog/'.$category->category_nicename.'">';
        $option .= $category->cat_name;
        $option .= ' ('.$category->category_count.')';
        $option .= '</option>';
        echo $option;
    }
    ?>

Most of the code is similar to the one you’re using. The only things worth explaining are:

  1. The child_of=10 assumes your parent category has an id 10. You’ll need to replace it with the real id of your category.

  2. The option value="/category/blog/ assumes that your permalinks are like this. If you have a different structure, you’ll need to change it accordingly.

You can check out the article on get_categories() on WordPress Codex for more examples and options. For further parameters to pass to get_categories($args) array refer to this page of the WordPress Developer documentation.

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