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

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