How to Add Filtering to Your Website
When a website has many products, articles, or other types of content, users need an easy way to find what they want. Website filters help users narrow down results by category, price, color, brand, and other attributes.
If you want to know how to add filtering to your website, this guide explains the different types of filters, how to build them, and which tools can help you create a better user experience.
1. Why Is Website Filtering Important?
Website filtering helps users find relevant products or content without browsing through every result.
Benefits of Website Filters
- Better product discovery: Help users find products that match their needs.
- Improved user experience: Make browsing easier and faster.
- More engagement: Help users explore relevant content.
- Higher conversion potential: Make it easier for shoppers to find and purchase products.
- Better organization: Group products and content by useful attributes.
Filters are useful for ecommerce stores, blogs, directories, marketplaces, and websites with large amounts of content.
2. Types of Website Filters
You can use different types of filters depending on your website and the information you want users to search.
a. Faceted Search Filters
Faceted filters allow users to select multiple options from different categories.
Example: A shopper can select a brand, color, and price range to find matching products.
b. Range Filters
Range filters let users choose a value between two numbers.
Examples:
- Price between $20 and $100
- Product ratings between 4 and 5
- Articles published within a selected date range
c. Hierarchical Filters
Hierarchical filters organize options into levels. Users can move from a broad category to a more specific one.
Example:
Electronics → Laptops → Gaming Laptops
d. Boolean Filters
Boolean filters let users switch between two options, such as yes or no.
Examples:
- In stock
- On sale
- Free shipping
e. Custom Attribute Filters
Custom filters use specific attributes related to your products or content.
Examples:
- Material
- Model number
- Release date
- Product specifications
3. How to Add Filters to Your Website
There are three common ways to build website filtering functionality.
1. Client-Side Filtering Using JavaScript
Client-side filtering happens directly in the user’s browser. JavaScript checks the available data and displays only the matching results.
This approach works well for small datasets where the website already has the required information loaded.
Advantages
- Results can update quickly.
- No additional server request is needed for each filter change.
- Simple filtering logic is easy to implement.
Disadvantages
- Loading large datasets into the browser can affect performance.
- It may not work well for websites with large product catalogs.
- Search engines may not discover filtered content unless it is rendered and made accessible appropriately.
JavaScript Filtering Example
The following example filters products by category and price:
const filtered = products.filter(
product =>
product.category === 'Shoes' &&
product.price < 100
);
This code displays products in the Shoes category that cost less than $100.
2. Server-Side Filtering Using a Database
Server-side filtering happens on your website’s backend. When a user selects a filter, the server queries the database and returns matching results.
This approach is useful for websites with large product catalogs or content databases.
Common Technologies
- PHP and MySQL
- Node.js and MongoDB
- Python Flask and PostgreSQL
SQL Filtering Example
This query finds shoes priced below $100 and sorts them by price:
SELECT *
FROM products
WHERE category = 'Shoes'
AND price < 100
ORDER BY price ASC;
Advantages
- Can handle large datasets more efficiently.
- Only matching results need to be returned.
- Can support server-rendered filter pages and URLs.
Disadvantages
- Requires backend development.
- Filter requests need to be handled by the server.
- Performance depends on database queries, caching, and implementation.
3. AJAX Filtering
AJAX filtering combines JavaScript with server-side filtering.
When users select filters, JavaScript sends a request to the server. The server returns matching results, and the page updates without a full reload.
Advantages
- Provides a smooth browsing experience.
- Supports large datasets through server-side queries.
- Updates results without reloading the entire page.
Disadvantages
- Requires frontend and backend integration.
- SEO needs additional planning.
- Filter URLs, canonical tags, and rendering must be handled correctly when SEO is important.
For many ecommerce websites, AJAX filtering is a useful approach because it combines dynamic updates with server-side processing.
4. Website Filtering Best Practices
A good filtering system should be easy to use on both desktop and mobile devices.
Follow These Best Practices
- Use collapsible filters: Keep the interface organized, especially when there are many filter options.
- Update results quickly: Show users the matching results without unnecessary delays.
- Add a clear-all option: Let users remove all selected filters easily.
- Show selected filters: Help users understand which options are active.
- Use URL parameters: Allow users to share filtered results when appropriate.
- Optimize for mobile: Use dropdowns, expandable sections, or slide-out filter menus.
- Handle empty results: Explain when no products or content match the selected filters.
How Filters Can Affect SEO
Filters can create many different URLs, especially when users combine multiple options.
To manage these URLs, consider:
- Which filtered pages should be available to search engines?
- Whether filtered URLs need unique, useful content.
- How canonical tags should be configured.
- Whether filter combinations create duplicate or low-value pages.
- How important filtered pages are for organic search traffic.
Important: Adding URL parameters alone does not guarantee SEO benefits. Filtered pages need to be crawlable and managed correctly.
5. Should You Build Your Own Filtering System?
Building a custom filtering system gives you control over how your website works. However, it also requires development time and ongoing maintenance.
Advantages of Custom Filtering
- Customize filters based on your website’s requirements.
- Control how filters interact with your data.
- Integrate filtering with your existing technology.
- Create a user interface that matches your website design.
Challenges of Custom Filtering
- Requires development and testing.
- Needs regular maintenance.
- Complex filters may require additional logic.
- Pagination and dependent filters can become difficult to manage.
- Performance optimization and caching may be necessary.
For websites with large catalogs, building and maintaining every filtering feature from scratch can become time-consuming.
6. Alternatives to Building Filters From Scratch
Website owners can also use filtering tools instead of developing the entire system themselves.
These tools can help manage filtering, search, and product discovery.
Popular Approaches
- Custom development: Build filtering using your own frontend, backend, and database.
- Search platforms: Use a search engine that supports filtering and facets.
- CMS plugins: Add filtering functionality through plugins available for your platform.
- Expertrec: Use a search and filtering solution designed for ecommerce and content-heavy websites.
Tools such as Algolia and Elasticsearch may require technical setup and development work. WordPress plugins can be easier to install, but available features depend on the plugin.
7. How Expertrec Helps Add Website Filters
Expertrec offers a search and filtering solution for ecommerce and content-heavy websites.
Instead of building every filtering feature from scratch, website owners can use its filtering capabilities to help users find relevant products and content.
Expertrec Filtering Features
- Faceted search: Help users narrow results using different attributes.
- Filter builder: Configure filtering options for your website.
- Filter URLs: Support filter-related URLs for relevant browsing and SEO needs.
- Mobile-friendly interface: Make filtering easier on mobile devices.
- Indexing and updates: Help keep searchable content updated.
Why Consider Expertrec?
- Reduce the need to build all filtering functionality from scratch.
- Customize the filtering experience for your website.
- Use search and filtering together to improve product discovery.
- Track filter usage through available analytics features.
- Explore integrations for supported ecommerce and CMS platforms.
Expertrec can be considered by ecommerce stores and content-heavy websites that want to improve how users find information.
Whether you manage an ecommerce store or a large content website, a well-designed filtering system can make browsing easier and help users find relevant results.
8. Conclusion
Website filtering helps users find products and content quickly. It is especially useful for ecommerce stores, directories, blogs, and websites with large amounts of information.
You can build filters using JavaScript, database queries, or AJAX. The right approach depends on your website’s size, technical requirements, and SEO goals.
Custom filtering offers flexibility, but it also requires development and maintenance. Search and filtering tools such as Expertrec can help simplify the process for websites that need search and filtering features.
If users depend on your website to find products or content, investing in a clear and efficient filtering experience can improve usability and product discovery.
Frequently Asked Questions
1. What is the best way to add filters to a website?
For many websites, AJAX filtering with server-side queries provides a useful balance of performance and usability. The best option depends on your data size and website requirements.
2. Can I add website filters without coding?
Yes. Some search and filtering platforms, including Expertrec, offer configuration tools that can reduce the amount of custom coding required.
3. Do website filters affect SEO?
They can affect SEO because filters may create many URL combinations. Use appropriate rendering, canonical tags, and crawl management to help search engines understand which pages should be indexed.
4. Can filters work on mobile websites?
Yes. Mobile websites can use dropdowns, collapsible sections, or slide-out menus to make filters easier to use on smaller screens.
5. Which CMS platforms can use Expertrec?
The source article lists Shopify, Magento, WordPress, and other platforms. Check Expertrec’s current integration documentation to confirm support for your specific website and setup.
