WordPress widget how to only display sub-categories based on selected Parent Category?

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I was wondering if anybody know hows to modify the existing category widget to only display the categories within the selected parent category.
Example:

If my categories are structured like:

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  • Computers
    • Laptops
    • Desktops
    • Software
  • Electronics
    • Cameras
    • Audio/Video

If somebody is viewing posts in the Computers category I would like the categories widget in the side bar to only display Laptops, Desktops & Software..

Is there a way to get this done? Is anybody familiar of a plugin that maybe do that?
Thanks!

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3 comments

  1. how about using something like this?
    on a singles page you could add a call from within the single.php page to a new sidebar or an include file…?

    ie: 

    <?php if( is_single() ) { include(TEMPLATEPATH.'/newsidebar.php'); } ?>

    newsidebar.php

    <ul> 
<?php 
 $catsy = get_the_category();
 $myCat = $catsy->cat_ID;
    wp_list_categories('orderby=id&child_of='.$myCat); 
?>
</ul>

    this will show only categories from the currently used category?

    ie:

    if current category is 5 // Computers
    then all that will be shown in the list is 

    * Laptops
* Desktops
* Software

  2. Thanks for your help. I was able to get it to work by doing this…

    <?php
if (is_category()) {
    $cat = get_query_var('cat');
    $this_category = get_category($cat);
    $this_category = wp_list_categories('hide_empty=0&hierarchical=true&orderby=id&show_count=0&title_li=&use_desc_for_title=1&child_of='.$this_category->cat_ID."&echo=0");
    if($this_category !='<li>No categories</li>')
    {
     echo '<h3>Products</h3>'; 
     echo '<ul>'.$this_category.'</ul>'; 
    }
}
?>

  3. 1) To Show only Subcategories:

    <?php
    // check if the page is viewed is a category page.
if (is_category())
{
$cur_cat = get_query_var('cat');
    if ($cur_cat) 
    {
        $new_cats = wp_list_categories('echo=false&child_of=' . $cur_cat . '&depth=1&title_li=&&show_count=1&hide_empty=0');
        echo '<ul>' . $new_cats . '</ul>';
    }
}
?>

    2) To Show All Main Categories:

    <?php 
wp_list_categories('depth=1&title_li=&exclude=1&show_count=1&hide_empty=0');
?>

    3) To show All Categories + Subcategories like Tree menu:

    Use FoCal plugin.

    4) view this code too:

    http://wpworks.wordpress.com/2011/01/13/displaying-categories-and-subcategories-tree-on-wordpress/