最近，有个客户想要让所有“筛选器”一直显示。例如，当你想要通过颜色筛选器筛选产品时，发现所有的筛选器都在，那么你就可以轻松地按其它条件筛选而不必返回类别页。
分层导航的文件默认在app/design/frontend/base/default/template/catalog/layer/下。分层导航的模版文件是view.phtml，用来显示筛选器。筛选器状态模版是state.phtml，当我们点击一个筛选器时，他响应结果。我们就要编辑state.phtml。将这个文件拷贝到你的包或主题中。
这是默认的state.phtml文件：
<?php $_filters = $this->getActiveFilters() ?>
<?php if(!empty($_filters)): ?>
<div class="currently">
<p class="block-subtitle"><?php echo $this->__('Currently Shopping by:') ?></p>
<ol>
<?php foreach ($_filters as $_filter): ?>
<li>
<a href="<?php echo $_filter->getRemoveUrl() ?>" title="<?php echo $this->__('Remove This Item') ?>" class="btn-remove"><?php echo $this->__('Remove This Item') ?></a>
<span class="label"><?php echo $this->__($_filter->getName()) ?>:</span> <?php echo $this->stripTags($_filter->getLabel()) ?>
</li>
<?php endforeach; ?>
</ol>
<div class="actions"><a href="<?php echo $this->getClearUrl() ?>"><?php echo $this->__('Clear All') ?></a></div>
</div>
<?php endif; ?>
我们将要在“currently”div块前面添加当前类别的url通道。代码如下：
<?php $obj = new Mage_Catalog_Block_Navigation(); ?>
<?php $_current_category=$obj->getCurrentCategory()->getUrlPath(); ?> //getting url path of current category
<?php $subs = $obj->getCurrentCategory()->getAllChildren(true); ?> //getting ids of subcategories of current category
现在，我们编辑 “currently”div块。我将它重新命名为state。因为它不再显示当前筛选器。
<?php if(!empty($_filters)): ?>
<div class="state">
<p class="block-subtitle"><?php echo $this->__('Currently Shopping by:') ?></p>
<dl>
<?php foreach ($_filters as $_filter): ?>
<dd>
<ol>
<?php $attributemodel=$_filter->filter->_data["attribute_model"]; ?> // getting attribute model that has all filter options in it from currently active filter
<?php $attroptions=$attributemodel->getSource()->getAllOptions();?> // getting attribute options (filters) from attribute model
<?php $_categ= Mage::getModel('catalog/category');?> // object containing all categories and their information
<?php foreach($subs as $cat_id): ?>
<?php $_categ->load($cat_id)?> //get the subcategory you need
<?php $collection = $_categ->getProductCollection(); ?> //get the product collection (object containing all product information)
<?php $collection->addAttributeToSelect('color')?> // get the desired attribute
<?php endforeach; ?>
接下来，我们需要提取属性模型的信息和组合链接。每一个属性选项 ($attroptions)都包含属性值和属性标签。
<?php foreach($attroptions as $attr): ?> // get value and label of each attribute
<?php $count=0; ?>
<?php if($attr["value"]!=""): ?>
<?php $val=$attr["value"] ?>
<?php $collection->addFieldToFilter(array(array('attribute'=>'themes','gt'=>10)))?> // collection of attribute values and labels for all values
//greater then 10 (in this case attribute values range was 18-39)
<?php $proddata=$collection->getData() ?> // get product data for all attribute values
<?php if($attr["label"]!= $this->stripTags($_filter->getLabel())): ?> // make a nice looking label
<?php foreach($proddata as $prod):?>
<?php if($prod["type_id"]=="configurable"): ?> // in this store all products were configurable
<?php $split=split(",", $prod["color"]);?> // get the attribute values that correspond with one product (a product may have more
// then one attribute value and they're separated by commas that's why we split the string with "," as deliminator)
即使你设置属性Filterable(with results) ，你仍然需要统计产品，这样只显示有产品的属性值。
<?php foreach($split as $color): ?> //check out how many products have the same attribute value
<?php if($color==$attr["value"]): ?>
<?php $count++;?>
<?php endif; ?>
<?php endforeach; ?>
<?php endif;?>
<?php endforeach; ?>
<?php if($count>0):?> // check if any product has that attribute value
<li><a href="<?php echo $this->getUrl('').$_current_category ?>?color=<?php echo $attr["value"]?>" ><?php echo $attr["label"]; ?></a></li> // if not currently active filter make a link
<?php endif; ?>
<?php else:?>
<li class="current"> <?php echo $this->stripTags($_filter->getLabel()); ?></li> // if currently active filter write out the label
<?php endif;?>
<?php endif; ?>
<?php endforeach; ?>
<?php endforeach; ?> // ending the first for loop (foreach($filters as $filter))
</ol>
</dd>
</dl>
<a class="all" style="float:right;" href="<?php echo $this->getClearUrl()?>">All</a> // show all products, return from current state back to category view
</div>
<?php endif; ?>
