There is no rel="next" and rel="prev" in drupal term pagas

Question

How can I add rel next and previous in drupal-7 term pages programmatically? and how important is rel for google?

some of my pages are listed here:

کاردستی

سوپ ساده

عکس کودک

کاردستی

کاردستی

Answer 1

there was no solution for it as a module i myself developed a module myself. i wish it could help you

first of all we user hook_preprocess_html and i checked if this page is a term page or not

if (arg(0) == 'taxonomy' && arg(1) == 'term') {

and then with use of page argument and function taxonomy_select_nodes you can find on what page your are and what is the next and prevoius page but one important this,

• First page has no previous page
• Last page has no next page

• and there is no page with argument page=1, this is the first page

  function your_theme_preprocess_html(&$variables) {
  
  if (arg(0) == 'taxonomy' && arg(1) == 'term') {
  
      $term = taxonomy_term_load(arg(2));
  
      if( $_GET && $_GET['page'] && is_numeric(@$_GET['page']) ){
          $prev = $_GET['page']-1;
          $next = $_GET['page']+1;
          $url = url('taxonomy/term/'.arg(2));
          if( $_GET['page'] > 1 ){
              $head_link  = array(
                  'rel' => 'prev',
                  'href' => 'http://yourdomain.com'.$url.'?page='.$prev
              );
              drupal_add_html_head_link($head_link);
          }
          if( $_GET['page'] == 1 ){
              $head_link  = array(
                  'rel' => 'prev',
                  'href' => 'http://yourdomain.com'.$url
              );
              drupal_add_html_head_link($head_link);
          }
  
          $numbers = taxonomy_select_nodes( arg(2),true ,1000 );
          if( count($numbers) > $next * 100 ){                
              $head_link  = array(
                  'rel' => 'next',
                  'href' => 'http://yourdomain.com'.$url.'?page='.$next
              );
              drupal_add_html_head_link($head_link);
          }
  
      }
      else {
          $numbers = taxonomy_select_nodes( arg(2),true ,1000 );
          if( count($numbers) > 100 ){                
              $url = url('taxonomy/term/'.arg(2));
              $head_link  = array(
                  'rel' => 'next',
                  'href' => 'http://yourdomain.com'.$url.'?page=1'
              );
              drupal_add_html_head_link($head_link);
          }
      }
  
  }
  }
  

this function taxonomy_select_nodes is really awesome, you give it "tid" of a term, it tells you how node is tagged with this term.

even you can add class to body with hook_preprocess_html

write all this code in template.php file in your theme