Change the behaviour of datatable Tag links

[einhirn]

I created a Patch that checks for the existance of a page called “Object” in the root namespace and in the current namespace. If it doesn't find anything, it checks whether <current_namespace>:start or <id_of_current_namespace> exists as a page and assumes a data table there.

--- data/helper.php     2009-02-13 15:26:25.000000000 +0100
+++ ./helper.php        2009-08-10 16:24:57.000000000 +0200
@@ -88,7 +88,7 @@
      * Return XHTML formated data, depending on type
      */
     function _formatData($key, $value, $type, &$R){
-        global $conf;
+        global $conf,$ID;
     $vals = explode("\n",$value);
     $outs = array();
     foreach($vals as $val){
@@ -120,7 +120,16 @@
             $outs[] = '<a href="'.hsc($val).'" class="urlextern" title="'.hsc($val).'">'.hsc($val).'</a>';
             break;
         case 'tag':
-                    $outs[] = '<a href="'.wl(str_replace('/',':',cleanID($key)),array('dataflt'=>$key.':'.$val )).
+                   $key_id=str_replace('/',':',cleanID($key));
+                   if(page_exists($key_id)) {
+                   } elseif (page_exists(getNS($ID).':'.$key_id)){
+                       $key_id=getNS($ID).':'.$key_id;
+                   } elseif (page_exists(getNS($ID).':'.$conf['start'])){
+                       $key_id=getNS($ID).':'.$conf['start'];
+                   } elseif (page_exists(getNS($ID))){
+                       $key_id=getNS($ID);

Maybe there is a more elegant solution to this problem, perhaps via config option or an option in the datatable syntax. I think that I saw such an option for the Tagcloud syntax...

[einhirn]

Together with current advancements in Datatable plugin (Type aliases) and this patch, there is a possibility to configure a type alias for "tag" that produces links in a definable namespace:

diff -u admin.php.orig admin.php
--- admin.php.orig  2010-04-28 07:29:00.000000000 +0200
+++ admin.php  2010-05-10 14:03:32.000000000 +0200
@@ -82,7 +82,7 @@

         $form->addElement('<td>');
         $form->addElement(form_makeMenuField('d['.$cur.'][type]',
-                                array('','page','title','mail','url', 'dt'),$row['type'],''));
+                                array('','tag','page','title','mail','url', 'dt'),$row['type'],''));
         $form->addElement('</td>');

         $form->addElement('<td>');
diff -u helper.php.orig helper.php
--- helper.php.orig  2010-04-28 07:29:00.000000000 +0200
+++ helper.php  2010-05-10 14:22:29.000000000 +0200
@@ -118,8 +118,14 @@
             $outs[] = '<a href="'.hsc($val).'" class="urlextern" title="'.hsc($val).'">'.hsc($val).'</a>';
             break;
         case 'tag':
-                    #FIXME handle pre/postfix
-                    $outs[] = '<a href="'.wl(str_replace('/',':',cleanID($column['key'])),array('dataflt'=>$column['key'].':'.$val )).
+                   #FIXME handle pre/postfix sensibly
+                    if(substr($column['prefix'],-1)==':') {
+                       $page=$column['prefix'].$column['key'].$column['postfix'];
+                   } else {
+                       $page=$column['prefix'];
+                   }
+
+                   $outs[] = '<a href="'.wl(str_replace('/',':',cleanID($page)),array('dataflt'=>$column['key'].'='.$val )).
                   '" title="'.sprintf($this->getLang('tagfilter'),hsc($val)).
                   '" class="wikilink1">'.hsc($val).'</a>';
             break;

The patch is a hack of the "works for me"-kind - maybe there is a more sensible approach to using "prefix" and "postfix" than what I coded. This code tests if the last character of "prefix" is the namespace divider. If so, it concatenates prefix, column-name and postfix to form the link target. Otherwise it just links to prefix.

[Klap-in]

Changing the target of tags can be done by using the alias feature of the data plugin.

Go to 'Admin' page and in the list below to 'Data Plugin: Field Aliases'
On the empthy line you fills:

• Type alias: Name for new type e.g. newtag
• Type: select tag
• Data Prefix: url of the page that contains the datatable which is filtered by this tag when clicked
• Data Postfix: keep empty
• Valid values: keep empty

Save aliases

Now you can use it in a dataentry, e.g.:

---- dataentry projects ----
type            : web development
task_newtags    : programming, coding, design, html
job_newtag      : full time
----

See also https://www.dokuwiki.org/plugin:data#change_tag_target_with_a_tag_type