Magento Adding search by category in advance search

Sometime we may need to change the options provided by the magento by default. Here are dealing with adding the “Search By Category” in the advance search page. For this case we need to change in the followinf files
➣ app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php
➣ app/code/core/Mage/CatalogSearch/Model/Advanced.php
➣ app/design/yourdesign/yourdesign/template/catalogsearch/advanced/form.phtml

At the very end of app/code/core/Mage/CatalogSearch/Block/Advanced/Form.php (before the closing brace), add:

public function getStoreCategories()
{
    $helper = Mage::helper('catalog/category');
    return $helper->getStoreCategories();
}

In app/code/core/Mage/CatalogSearch/Model/Advanced.php, replace the getSearchCriterias() function (line 157) with the code below:

     public function getSearchCriterias()
        {
            $search = $this->_searchCriterias;
            /* display category filtering criteria */
            if(isset($_GET['category']) && is_numeric($_GET['category'])) {
                $category = Mage::getModel('catalog/category')->load($_GET['category']);
                $search[] = array('name'=>'Category','value'=>$category->getName());
            }
            return $search;
        }

replace the next function, getProductCollection(), with:

public function getProductCollection(){
        if (is_null($this->_productCollection)) {
            $this->_productCollection = Mage::getResourceModel('catalogsearch/advanced_collection')
                ->addAttributeToSelect(Mage::getSingleton('catalog/config')->getProductAttributes())
                ->addMinimalPrice()
                ->addStoreFilter();
                Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($this->_productCollection);
                Mage::getSingleton('catalog/product_visibility')->addVisibleInSearchFilterToCollection($this->_productCollection);
            /* include category filtering */
            if(isset($_GET['category']) && is_numeric($_GET['category'])) $this->_productCollection->addCategoryFilter(Mage::getModel('catalog/category')->load($_GET['category']),true);
        }
 
        return $this->_productCollection;
    }

In app/design/yourdesign/yourdesign/template/catalogsearch/advanced/form.phtml, after this code:

 <?php foreach ($this->getSearchableAttributes() as $_attribute): ?>
        <?php $_code = $_attribute->getAttributeCode() ?>
            <label for="<?php echo $_code ?>"><?php echo $this->getAttributeLabel($_attribute) ?></label>
            <?php switch($this->getAttributeInputType($_attribute)):
                case 'number': ?>
                <div class="range field-row">
                    <input name="<?php echo $_code ?>[from]" value="<?php echo $this->htmlEscape($this->getAttributeValue($_attribute, 'from')) ?>" id="<?php echo $_code ?>" title="<?php echo $this->htmlEscape($this->getAttributeLabel($_attribute)) ?>"  class="input-text validate-number" type="text" />
                    <input name="<?php echo $_code ?>[to]" value="<?php echo $this->htmlEscape($this->getAttributeValue($_attribute, 'to')) ?>" id="<?php echo $_code ?>_to" title="<?php echo $this->htmlEscape($this->getAttributeLabel($_attribute)) ?>"  class="input-text validate-number" type="text"/>
                </div>
                <?php break;
                case 'select': ?>
                    <?php echo $this->getAttributeSelectElement($_attribute) ?>
                <?php break;
                case 'yesno': ?>
                    <?php echo $this->getAttributeYesNoElement($_attribute) ?>
                <?php break;
                case 'date': ?>
                    <?php echo $this->getDateInput($_attribute, 'from') ?>
                    -
                    <?php echo $this->getDateInput($_attribute, 'to') ?>
                <?php break;
                default: ?>
                <input name="<?php echo $_code ?>" id="<?php echo $_code ?>" value="<?php echo $this->htmlEscape($this->getAttributeValue($_attribute)) ?>" title="<?php echo $this->htmlEscape($this->getAttributeLabel($_attribute)) ?>"  class="input-text <?php echo $this->getAttributeValidationClass($_attribute) ?>" type="text" />
            <?php endswitch; ?>
        <?php endforeach; ?>

add:

            <label for="category_search_field">Search by Category:</label>
            <select name="category" id="category_search_field">
                <option value="">-- Any Category --</option>
                <?php foreach ($this->getStoreCategories() as $_category): ?>
                <?php if($_category->hasChildren()): ?>
                <option class="parent-cat" value="<?php echo $_category->getId(); ?>"><?php echo $_category->getName();?></option>
                <?php foreach ($_category->getChildren() as $subcategory):
                if($subcategory->getIsActive()) : ?>
                    <option value="<?php echo $subcategory->getId(); ?>"<?php echo ($this->getRequest()->getQuery('category') == $subcategory->getId() ? ' selected="selected"': "") ?>><?php echo $subcategory->getName(); ?></option>
                <?php endif; endforeach; ?>
                <?php elseif($_category->getIsActive()): ?>
                <option value="<?php echo $_category->getId(); ?>"><?php echo $_category->getName();?></option>
                <?php endif; ?>
                <?php endforeach ?>
 
            </select>

Then open app/code/core/Mage/CatalogSearch/Model/Advanced.php
Open the file and search this function addFilters. In this function you can see following codes, replace this

    if ($allConditions) {
                $this->getProductCollection()->addFieldsToFilter($allConditions);
            } else if (!count($filteredAttributes)) {
                Mage::throwException(Mage::helper('catalogsearch')->__('You have to specify at least one search term'));
            }

with following codes:

    if (($allConditions) || (isset($values['category']) && is_numeric($values['category']))) {
                $this->getProductCollection()->addFieldsToFilter($allConditions);
            } else if (!count($filteredAttributes)) {
                Mage::throwException(Mage::helper('catalogsearch')->__('You have to specify at least one search term'));
            }

After above steps is done you will get the output as below
search by category

Source : http://www.magentocommerce.com/wiki/5_-_modules_and_development/search_and_advanced_search/how_to_add_search_by_category_to_advanced_search

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