创建一个读取目录的块来展示块创建过程。块创建跟建立一个模块很类似。
这里报名为Vfeelit,模块名为Catcus，块类名为Vfeelit_Catcus_Block_Menu:
app/etc/modules/Vfeelit_Helloworld.xml app/code/local/Vfeelit/Catcus/etc/config.xml app/code/local/Vfeelit/Catcus/block/Menu.php app/design/frontend/default/default/layout/catcus.xml app/design/frontend/default/default/template/catcus/menu.phtml
app/etc/modules/Vfeelit_Helloworld.xml
<?xml version="1.0"?>
<config>
<modules>
<Vfeelit_Catcus>
<active>true</active>
<codePool>local</codePool>
</Vfeelit_Catcus>
</modules>
</config>
app/code/local/Vfeelit/Catcus/etc/config.xml
<?xml version="1.0"?>
<config>
<modules>
<Vfeelit_Catcus>
<version>1.0.0.0</version>
</Vfeelit_Catcus>
</modules>
<frontend>
<layout>
<updates>
<catcus>
<file>catcus.xml</file>
</catcus>
</updates>
</layout>
</frontend>
<global>
<blocks>
<catcus>
<class>Vfeelit_Catcus_Block</class>
</catcus>
</blocks>
</global>
</config>
注意这个配置文件，必须给出布局对应的文件，否则找不到。还有前台必须给出块的类。
app/code/local/Vfeelit/Catcus/block/Menu.php
<?php
class Vfeelit_Catcus_Block_Menu extends Mage_Core_Block_Template
{
/**
* Top menu data tree
*
* @var Varien_Data_Tree_Node
*/
protected $_menu;
/**
* Init top menu tree structure
*/
public function _construct()
{
$this->_menu = new Varien_Data_Tree_Node(array(), 'root', new Varien_Data_Tree());
}
public function addCategoriesToMenu($categories, $parentCategoryNode)
{
foreach ($categories as $category) {
if (!$category->getIsActive()) {
continue;
}
$nodeId = 'category-node-' . $category->getId();
$tree = $parentCategoryNode->getTree();
$categoryData = array(
'name' => $category->getName(),
'id' => $nodeId,
'url' => Mage::helper('catalog/category')->getCategoryUrl($category),
'is_active' => $this->_isActiveMenuCategory($category)
);
$categoryNode = new Varien_Data_Tree_Node($categoryData, 'id', $tree, $parentCategoryNode);
$parentCategoryNode->addChild($categoryNode);
if (Mage::helper('catalog/category_flat')->isEnabled()) {
$subcategories = (array)$category->getChildrenNodes();
} else {
$subcategories = $category->getChildren();
}
$this->addCategoriesToMenu($subcategories, $categoryNode);
}
}
protected function _isActiveMenuCategory($category)
{
$catalogLayer = Mage::getSingleton('catalog/layer');
if (!$catalogLayer) {
return false;
}
$currentCategory = $catalogLayer->getCurrentCategory();
if (!$currentCategory) {
return false;
}
$categoryPathIds = explode(',', $currentCategory->getPathInStore());
return in_array($category->getId(), $categoryPathIds);
}
/**
* Get top menu html
*
* @param string $outermostClass
* @param string $childrenWrapClass
* @return string
*/
public function getHtml($cid ='', $recursionLevel = 0, $outermostClass = '', $childrenWrapClass = '')
{
$cid = (int)$cid;
$recursionLevel = (int)$recursionLevel;
$category = Mage::getModel('catalog/category');
if (!$category->checkId($cid)) {
return '';
}
$categories = $category->getCategories($cid, $recursionLevel);
$this->addCategoriesToMenu($categories,$this->_menu);
$this->_menu->setOutermostClass($outermostClass);//level-top $this->_menu->_data['OutermostClass'] = 'level-top'
$this->_menu->setChildrenWrapClass($childrenWrapClass); //$this->_menu->_data['ChildrenWrapClass'] = ''
$html = $this->_getHtml($this->_menu, $childrenWrapClass);
return $html;
}
/**
* Recursively generates top menu html from data that is specified in $menuTree
*
* @param Varien_Data_Tree_Node $menuTree
* @param string $childrenWrapClass
* @return string
*/
public function _getHtml(Varien_Data_Tree_Node $menuTree, $childrenWrapClass)
{
$html = '';
$children = $menuTree->getChildren(); // $this->_menu Varien_Data_Tree_Node_Collection
$parentLevel = $menuTree->getLevel(); //root -> null $this->_menu->_data['level'] = null
$childLevel = is_null($parentLevel) ? 0 : $parentLevel + 1;
$counter = 1;
$childrenCount = $children->count(); //nodes total
$parentPositionClass = $menuTree->getPositionClass(); //no set
$itemPositionClassPrefix = $parentPositionClass ? $parentPositionClass . '-' : 'nav-'; //can get 'nav-'
foreach ($children as $child) {
$child->setLevel($childLevel);
$child->setIsFirst($counter == 1);
$child->setIsLast($counter == $childrenCount);
$child->setPositionClass($itemPositionClassPrefix . $counter);
$outermostClassCode = '';
$outermostClass = $menuTree->getOutermostClass();
if ($childLevel == 0 && $outermostClass) {
$outermostClassCode = ' class="' . $outermostClass . '" ';
$child->setClass($outermostClass);
}
$html .= '<li ' . $this->_getRenderedMenuItemAttributes($child) . '>';
$html .= '<a href="' . $child->getUrl() . '" ' . $outermostClassCode . '><span>'
. $this->escapeHtml($child->getName()) . '</span></a>';
if ($child->hasChildren()) {
if (!empty($childrenWrapClass)) {
$html .= '<div class="' . $childrenWrapClass . '">';
}
$html .= '<ul class="level' . $childLevel . '">';
$html .= $this->_getHtml($child, $childrenWrapClass);
$html .= '</ul>';
if (!empty($childrenWrapClass)) {
$html .= '</div>';
}
}
$html .= '</li>';
$counter++;
}
return $html;
}
/**
* Generates string with all attributes that should be present in menu item element
*
* @param Varien_Data_Tree_Node $item
* @return string
*/
protected function _getRenderedMenuItemAttributes(Varien_Data_Tree_Node $item)
{
$html = '';
$attributes = $this->_getMenuItemAttributes($item);
foreach ($attributes as $attributeName => $attributeValue) {
$html .= ' ' . $attributeName . '="' . str_replace('"', '\"', $attributeValue) . '"';
}
return $html;
}
/**
* Returns array of menu item's attributes
*
* @param Varien_Data_Tree_Node $item
* @return array
*/
protected function _getMenuItemAttributes(Varien_Data_Tree_Node $item)
{
$menuItemClasses = $this->_getMenuItemClasses($item);
$attributes = array(
'class' => implode(' ', $menuItemClasses)
);
return $attributes;
}
/**
* Returns array of menu item's classes
*
* @param Varien_Data_Tree_Node $item
* @return array
*/
protected function _getMenuItemClasses(Varien_Data_Tree_Node $item)
{
$classes = array();
$classes[] = 'level' . $item->getLevel();
$classes[] = $item->getPositionClass();
if ($item->getIsFirst()) {
$classes[] = 'first';
}
if ($item->getIsActive()) {
$classes[] = 'active';
}
if ($item->getIsLast()) {
$classes[] = 'last';
}
if ($item->getClass()) {
$classes[] = $item->getClass();
}
if ($item->hasChildren()) {
$classes[] = 'parent';
}
return $classes;
}
}
用这个块类来输出任意目录的子目录。
app/design/frontend/default/default/layout/catcus.xml
<layout version="0.1.0">
<default>
<reference name="top.container">
<block type="catcus/menu" name="catcus.menu" template="catcus/menu.phtml"/>
</reference>
</default>
</layout>
把这个块放在top.container中输出。
app/design/frontend/default/default/template/catcus/menu.phtml
<?php echo $this->getHtml(3);
直接输出内容。
建立一个自定义的块基本就设置这些文件。块的类是应该继承自Mage_Core_Block_Template的。模块的配置文件中必须指定块的类前缀和使用的布局文件。
永久链接：http://blog.ifeeline.com/531.html
原创文章，转载务必保持出处。
