Magento 2 Get Custom Attribute Values In Phtml For Dynamic Product Filtering

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#h1 Magento 2: Retrieving Custom Attribute Values in phtml for Dynamic Filtering \nIn the realm of e-commerce, Magento 2 stands as a robust and flexible platform, empowering developers to tailor online stores to meet specific business needs. A key aspect of customization lies in the ability to create and utilize custom product attributes. This article delves into the process of retrieving custom attribute values within phtml templates in Magento 2, focusing on a practical scenario: populating a select dropdown with gender options on a listing page and implementing dynamic product filtering based on the selected gender.

Understanding Custom Attributes in Magento 2

Custom attributes in Magento 2 are additional data fields that you can associate with products, categories, or other entities. These attributes extend the default Magento data model, allowing you to store and display information specific to your products. For example, you might create a custom attribute for "Gender," "Color," "Size," or any other product characteristic relevant to your inventory. These attributes can be used for various purposes, including:

  • Displaying product information on the product page
  • Filtering products on category pages
  • Creating layered navigation filters
  • Using attributes in promotional rules
  • Including attributes in product exports and imports

In this context, we'll concentrate on using a custom attribute named "Gender" to enhance product filtering on a listing page. This involves retrieving the available gender options and dynamically updating the product list based on the user's selection. Understanding how to retrieve custom attribute values is crucial for creating dynamic and user-friendly e-commerce experiences.

Scenario: Implementing Gender-Based Filtering

Imagine an online apparel store where customers want to filter products by gender (e.g., Men, Women, Unisex). To achieve this, we can create a custom attribute named "Gender" with the following options:

  • Men
  • Women
  • Unisex

The goal is to display these options in a select dropdown on the listing page. When a user selects a gender, the product list should automatically update to show only products matching the selected gender. This requires the following steps:

  1. Retrieve the attribute options: Access the "Gender" attribute and fetch its available options (Men, Women, Unisex).
  2. Populate the select dropdown: Dynamically generate the HTML for the select dropdown, including the attribute options.
  3. Implement filtering logic: When the user selects an option, trigger an event to filter the product collection based on the selected gender.
  4. Update the product list: Refresh the product list to display the filtered results.

Let's explore the code implementation for each of these steps.

Step-by-Step Implementation

1. Retrieving Attribute Options in phtml

To begin, we need to retrieve the values for our custom attribute, "Gender". This is typically done within your phtml template where you want to render the dropdown. Magento 2 provides several ways to access attribute information. One common approach involves using the Magento\Eav\Model\Config and Magento\Catalog\Model\ResourceModel\Eav\Attribute classes. Here’s how you can retrieve the attribute options:

<?php
/** @var \Magento\Framework\View\Element\Template $block */
/** @var \Magento\Eav\Model\Config $eavConfig */
$eavConfig = $block->getData('eavConfig');
/** @var \Magento\Catalog\Model\ResourceModel\Eav\Attribute $attribute */
$attribute = $eavConfig->getAttribute('catalog_product', 'gender');
$options = $attribute->getSource()->getAllOptions();
?>

In this code snippet:

  • We obtain an instance of Magento\Eav\Model\Config to access EAV (Entity-Attribute-Value) configurations.
  • We use $eavConfig->getAttribute('catalog_product', 'gender') to retrieve the "Gender" attribute. Replace 'gender' with your attribute code if it's different.
  • $attribute->getSource()->getAllOptions() fetches all available options for the attribute. These options are stored in the $options variable, which we will use to populate the dropdown.

2. Populating the Select Dropdown

Now that we have the attribute options, we can use them to generate the HTML for our select dropdown. We'll iterate through the $options array and create an <option> element for each value:

<select id="gender-filter">
    <option value="">-- Please Select Gender --</option>
    <?php foreach ($options as $option):
        if (!empty($option['value'])):
            ?>
            <option value="<?php echo $block->escapeHtml($option['value']) ?>">
                <?php echo $block->escapeHtml($option['label']) ?>
            </option>
        <?php endif; ?>
    <?php endforeach; ?>
</select>

Here's what's happening in this code:

  • We create a <select> element with the ID gender-filter. This ID will be used to target the dropdown with JavaScript for filtering.
  • We add a default option -- Please Select Gender --.
  • We loop through the $options array. For each option, we create an <option> element with the value attribute set to the option's value and the text content set to the option's label.
  • We use $block->escapeHtml() to ensure that the values and labels are properly escaped for HTML, preventing potential security issues.

3. Implementing Filtering Logic with JavaScript

To implement dynamic filtering, we need to use JavaScript to listen for changes in the select dropdown and update the product list accordingly. This involves the following steps:

  1. Listen for the change event: Attach an event listener to the gender-filter select element.
  2. Get the selected value: When the user selects an option, retrieve the selected value.
  3. Filter the product collection: Send an AJAX request to a controller that filters the product collection based on the selected gender.
  4. Update the product list: Replace the existing product list with the filtered results.

Here’s a basic JavaScript implementation:

require([
    'jquery',
    'Magento_Catalog/js/product/list/toolbar'
], function ($) {
    $(document).ready(function () {
        $('#gender-filter').on('change', function () {
            var genderValue = $(this).val();
            var currentUrl = window.location.href;
            var url;

            if (currentUrl.indexOf('?') > -1) {
                if (currentUrl.indexOf('gender') > -1) {
                    url = currentUrl.replace(/gender=([^&#]*)/g, 'gender=' + genderValue);
                } else {
                    url = currentUrl + '&gender=' + genderValue;
                }
            } else {
                url = currentUrl + '?gender=' + genderValue;
            }

            window.location.href = url;
        });
    });
});

In this JavaScript code:

  • We use require to load jQuery and the Magento toolbar component.
  • We attach a change event listener to the gender-filter select element.
  • Inside the event handler, we get the selected gender value using $(this).val().
  • We construct the URL with the gender filter parameter. If there are existing parameters, we append the new parameter; otherwise, we add it.
  • Finally, we redirect the user to the new URL, which triggers a page reload with the filtered product list.

4. Creating a Controller to Handle Filtering

To handle the filtering logic on the server side, you'll need to create a custom controller. This controller will receive the selected gender value and filter the product collection accordingly. Here’s a simplified example of a controller action:

<?php

namespace Vendor\Module\Controller\Category;

use Magento\Catalog\Controller\Category\View;
use Magento\Framework\App\Action\Context;
use Magento\Catalog\Model\Session;
use Magento\Framework\View\Result\PageFactory;
use Magento\Catalog\Api\CategoryRepositoryInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Controller\Result\ForwardFactory;

class GenderFilter extends View
{
    /**
     * @var \Magento\Catalog\Model\Layer\Resolver
     */
    private $layerResolver;

    public function __construct(
        Context $context,
        Session $catalogSession,
        PageFactory $resultPageFactory,
        CategoryRepositoryInterface $categoryRepository,
        ForwardFactory $resultForwardFactory,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver
    ) {
        $this->layerResolver = $layerResolver;
        parent::__construct(
            $context,
            $catalogSession,
            $resultPageFactory,
            $categoryRepository,
            $resultForwardFactory
        );
    }

    public function execute()
    {
        $gender = $this->getRequest()->getParam('gender');
        $resultPage = parent::execute();
        
        if ($gender) {
            $this->layerResolver->get()->getState()->addFilter(
                'gender',
                $gender,
                \Magento\Catalog\Model\Layer::FILTER_CATEGORY
            );
        }

        return $resultPage;
    }
}

In this controller action:

  • We retrieve the gender parameter from the request.
  • We get the result page from the parent execute method.
  • If a gender value is present, we use the LayerResolver to add a filter to the product collection.
  • We return the result page, which will now display the filtered product list.

5. Updating the Product List

The JavaScript code we implemented in step 3 redirects the user to the filtered URL. When the page reloads, Magento will execute the controller action, which filters the product collection and renders the updated product list. This ensures that the user sees only the products matching the selected gender.

Conclusion

Retrieving custom attribute values in phtml templates is a powerful technique for enhancing the functionality and user experience of your Magento 2 store. By following the steps outlined in this article, you can implement dynamic filtering based on custom attributes, such as gender, and provide your customers with a more tailored browsing experience. Remember to adapt the code examples to your specific attribute codes and requirements. Understanding how to effectively use Magento 2 custom attributes is essential for creating a flexible and scalable e-commerce platform.

By implementing gender-based filtering, you empower customers to quickly find the products they're looking for, leading to increased engagement and sales. This approach can be extended to other custom attributes, such as size, color, and brand, providing a comprehensive filtering system that meets the diverse needs of your customer base. The ability to dynamically filter products based on attribute values significantly enhances the user experience and drives conversions.

This comprehensive guide provides a solid foundation for working with custom attributes in Magento 2. As you become more familiar with the platform, you can explore more advanced techniques, such as using custom attributes in layered navigation, promotional rules, and product recommendations. The flexibility of Magento 2's attribute system allows you to create a truly unique and customized online store. Remember that the key to successful e-commerce is providing a seamless and intuitive shopping experience, and custom attributes play a vital role in achieving this goal. By mastering the use of custom attributes, you can unlock the full potential of your Magento 2 store and deliver exceptional value to your customers.