Magento Show parent and subcategories

Question

How do I show on a category page in Magento only the parent category and subcategories?

When a subcategory is clicked the navigation has to stay the same.

Example: If I have

Category 1

• subcat 1
• subcat 2
• subcat 3

After clicking on any subcategory (say subcat 1), I want the same i.e :

Category 1

• subcat 1
• subcat 2
• subcat 3

What I got now:

<?php
 if (Mage::registry('current_category'))
{
  echo Mage::registry('current_category')->getName();
} 
?> 

 <?php
    $currentCat = Mage::registry('current_category');

    if ( $currentCat->getParentId() == Mage::app()->getStore()->getRootCategoryId() )
    {
        // current category is a toplevel category
        $loadCategory = $currentCat;

    }
    else
    {
        // current category is a sub-(or subsub-, etc...)category of a toplevel category
        // load the parent category of the current category
        $loadCategory = Mage::getModel('catalog/category')->load($currentCat->getParentId());
        // @TODO enhance for more nested category levels to display sub-categories
    }    
    $subCategories = explode(',', $loadCategory->getChildren());

    foreach ( $subCategories as $subCategoryId )
    {
        $cat = Mage::getModel('catalog/category')->load($subCategoryId);

        if($cat->getIsActive())
        {
            echo '<a href="'.$cat->getURL().'">'.$cat->getName().'</a> ';
        }
    }
?>

But of course this isn't working correct but I can't find a good solution so that Category 1 stays the same when I press subcat 1.

And it would be wonderful if the selected subcategory would be bold.

Answer 1

In your code, in place of

<?php
 if (Mage::registry('current_category'))
    {
      echo Mage::registry('current_category')->getName();
    } 
?> 

Try using

<?php
function getParentTopCategory($c)
    {
        if($c->getLevel() == 2){
            return $c;
        } else {
            $parentCategory = Mage::getModel('catalog/category')->load($c->getParentId());
            return getParentTopCategory($parentCategory);
        }
    }

 if (Mage::registry('current_category'))
    {
      $category = Mage::registry('current_category');
      $t = getParentTopCategory($category);
      echo $t->getName();
    } 
?>

It should work.

EDIT: Here is your complete solution :-

$crcat = Mage::registry('current_category')->getName(); //The current category name is stored in $crcat
function getParentTopCategory($c)
    {
        if($c->getLevel() == 2){
            return $c;
        } else {
            $parentCategory = Mage::getModel('catalog/category')->load($c->getParentId());
            return getParentTopCategory($parentCategory);
        }
    }

 if (Mage::registry('current_category'))
{
  $category = Mage::registry('current_category');
        $t = getParentTopCategory($category);
        if($crcat == $t->getName())                 //Check if current category is the topmost category
            echo "<b>".$t->getName()."</b>";        //If yes display it as bold (Currently Selected)
        else                                        //
            echo $t->getName();                     //Otherwise display it as normal

        echo "<br>";
} 
?> 

 <?php
    $currentCat = Mage::registry('current_category');

    if ( $currentCat->getParentId() == Mage::app()->getStore()->getRootCategoryId() )
    {
        // current category is a toplevel category
        $loadCategory = $currentCat;

    }
    else
    {
        // current category is a sub-(or subsub-, etc...)category of a toplevel category
        // load the parent category of the current category
        $loadCategory = Mage::getModel('catalog/category')->load($currentCat->getParentId());
        // @TODO enhance for more nested category levels to display sub-categories
    }    
    $subCategories = explode(',', $loadCategory->getChildren());

    foreach ( $subCategories as $subCategoryId )
    {
        $cat = Mage::getModel('catalog/category')->load($subCategoryId);

        if($cat->getIsActive())
        {
            if($crcat == $cat->getName())                                                   //Check if current category is this subcategory
                echo '<b><a href="'.$cat->getURL().'">'.$cat->getName().'</a></b>'.'</br>'; //If yes display it as bold (Currently Selected)
            else                                                                            //
                echo '<a href="'.$cat->getURL().'">'.$cat->getName().'</a>'.'</br>';        //Otherwise display it as normal
        }
    }