Change the default taxonomy/term/n view

I assume you are talking about customising the URI that displays in the address bar in the browser - to do this manually, you can use the URL Alias module included with Drupal core. If you would like it done automatically, you can use the PathAuto module, which is available in the contributed module section of this site. PathAuto will allow you to customise the way in which it overrides the URI.

As for customising what is viewed on category pages, I am not entirely sure what you are trying to acheive, but perhaps you could look at the view modules, available on this site too. I have never used views myself though.

you should investigate the Views module. I can't quite tell exactly what you are trying to do, but I think you'd find Views eye opening anyway and worth looking over.

--
Anton
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I required a similar thing, and wrote the following code into my page.tpl.php - hope you can find something helpful in there. If anyone reckons there is a simpler way to achieve this, please let me know.

-Chris

P.S. - the code works around the fact that I have two parallel and matching vocabularies, one for forums, one for everything else. A bit annoying to say the least.

<?php
	if(arg(0)=='taxonomy'){
		$tax_children = taxonomy_get_children(arg(2), 3);
		if(!empty($tax_children)){ 
		//If there are sub-categories, display links to the latest articles within each of those categories
			foreach ($tax_children as $tax_child){
				$tax_node_count = taxonomy_term_count_nodes($tax_child->tid);
				if(!empty($tax_node_count)){
				?>
				<div class="taxonomy_box">
				<h2><?php echo l($tax_child->name, 'taxonomy/term/'.$tax_child->tid); ?></h2>
				<?php
				$tax_nodes = taxonomy_select_nodes(array($tax_child->tid));
				  if (db_num_rows($tax_nodes) > 0) {
				    while ($tax_node = db_fetch_object($tax_nodes)) {
				    	if($tax_node->type == 'article'){
				    		echo '<p>';
				    		echo l($tax_node->title, 'node/'.$tax_node->nid);
				    		echo '</p>';
				    	}
				    }
				  }
				  else {
				    echo '<p>'. t('There are currently no articles in this category.') .'</p>';
				  }
				?>
				</div>
				<?php
				}
			}
		} else {
		//If there are no sub-categories, display articles, events, forum, etc.
			$tax_child = taxonomy_get_term(arg(2));
			echo '<h1>'.$tax_child->name.'</h1>';
			$tax_children = taxonomy_get_term_by_name($tax_child->name);
			foreach($tax_children as $tax_child){
				$tax_node_count = taxonomy_term_count_nodes($tax_child->tid);
				$tax_nodes = taxonomy_select_nodes(array($tax_child->tid));
				if (db_num_rows($tax_nodes) > 0) {
					while ($tax_node = db_fetch_object($tax_nodes)) {
						switch ($tax_node->type){
							case 'article':
								$tax_output_article .= '<p>'.l($tax_node->title, 'node/'.$tax_node->nid).'</p>';
								break;
							case 'event':
								$tax_output_event .= '<p>'.l($tax_node->title, 'node/'.$tax_node->nid).'</p>';
								break;
							case 'forum':
								$tax_output_forum .= '<p>'.l($tax_node->title, 'node/'.$tax_node->nid).'</p>';
								break;
						}
					}
				}
			}
			if(!empty($tax_output_article)){
				echo '<div class="taxonomy_box"><h2>Latest Articles</h2>'.$tax_output_article.'</div>';
			}
			if(!empty($tax_output_event)){
				echo '<div class="taxonomy_box"><h2>Upcoming Events</h2>'.$tax_output_event.'</div>';
			}
			if(!empty($tax_output_forum)){
				echo '<div class="taxonomy_box"><h2>Latest Forum Topics</h2>'.$tax_output_forum.'</div>';
			}
		}
	} else {
		echo $content;
	}
?>

I've found a very elegant solution to redirect the standard taxonomy listing (taxonomy/term/n) to a view.

1) Create a view with a path. e.g browse/regions
2) With path auto, redirect your specific vocabulary or all vocabularies to the path of your view.

If somebody is trying to pull this off in Drupal 7, I sugguest you to look into Taxonomy Display. So far it has worked for me.