# Filter (UI)

> Controls that narrow a set of records — and the much harder job of keeping what was narrowed visible.

- Category: UI Components
- Canonical: https://www.themasterly.com/glossary/filter-ui

Filters narrow a set of records. The controls themselves are mostly solved — a panel, some checkboxes, a date range. What is repeatedly not solved is keeping the narrowing visible after the panel closes.

That is where nearly all filter problems come from, and it is why the most valuable part of a filter interface usually sits outside it.

## The state has to be visible

Somebody applies three filters, closes the panel, and sees four results out of nine thousand. Two days later they return, do not remember what they set, and report that records are missing.

A row of [chips](https://www.themasterly.com/glossary/chip-ui) above the results ends that category of support ticket. Each active filter named, each individually removable, and one control to clear them all. It costs a line of vertical space and it makes the query legible at the same moment as its results.

This matters more in B2B than anywhere else, because filters get set from several places — a panel, a column header, a saved view, a link from a colleague — and no single control knows about all of them. The chip row does.

## What belongs in the URL

Active filters, sort, page and column set. All of it.

Without it: a filtered view cannot be pasted into a message, refresh loses the work, the back button does something unexpected after opening a record, and a support article cannot point at a specific state.

This is the least glamorous item in any table-heavy product and the one that produces the most daily friction when it is missing.

## Filtering against searching

| | Filter | [Search](https://www.themasterly.com/glossary/search-ui) |
|---|---|---|
| Narrows by | Known attributes | Free text against content |
| Values are | Enumerable and showable | Open |
| Good when | You know the dimension | You know a word |
| Fails when | The dimension is not offered | You do not know the vocabulary |

Products that offer only search for something that is genuinely an attribute make people guess the internal vocabulary. Products that offer only filters make people hunt for a record they could have named.

## Details that decide whether it is used

**Show counts where you can.** *Active (312)* tells somebody whether the filter is worth applying before they apply it.

**Order by usefulness, not alphabetically.** Status and owner before a field three people use.

**Immediate or submitted, never ambiguous.** If filters apply on submit, the pending state must be obvious and the button must be reachable without scrolling.

**Filtering resets the page.** Page seven of a new result set is meaningless, and products that keep the page number here show an empty screen and look broken. See [pagination](https://www.themasterly.com/glossary/pagination-ui).

**Saved views for what repeats.** In a tool people use daily, the same three filters get set every morning. Letting them be saved and shared is usually worth more than any additional filter dimension.

**Empty because filtered is its own state.** See [empty state](https://www.themasterly.com/glossary/empty-state).

## In practice

A product adds a filter panel to its main table. Usage is high, and so is a new class of support ticket: customers reporting that records have disappeared.

Every one of them has filters applied. The panel is a modal that closes on apply, so nothing on the screen afterwards indicates the list is narrowed, and the result count sits in small text most people do not read.

The repair is not a better panel. A chip row above the table, each filter named and removable, a Clear all beside it, and the filter state in the URL so the view can be shared and restored.

The tickets stop. The filters were working correctly throughout; the interface had simply never said so.

## Where teams get it wrong

- **State only inside the panel.** Close it and the query becomes invisible.
- **Nothing in the URL.** Nothing shareable, restorable or linkable.
- **Keeping the page number.** An empty screen that looks like a bug.
- **The first-run empty state on a filtered result.** Told to create a first record with nine thousand in the account.
- **Alphabetical filter order.** The useful dimensions buried among the rare ones.
- **Search offered where a filter was needed.** People guessing the internal vocabulary.

## Related terms

- [Data Table](https://www.themasterly.com/glossary/data-table)
- [Chip UI](https://www.themasterly.com/glossary/chip-ui)
- [Search UI](https://www.themasterly.com/glossary/search-ui)
- [Information Architecture](https://www.themasterly.com/glossary/information-architecture)

## Learn more

- [Dashboard design: patterns and examples](https://www.themasterly.com/blog/dashboard-design)

## FAQ

**What makes a good filter interface?**

Keeping the active filters visible outside the panel that set them. Most filter problems are not about the controls at all: somebody applies three filters, closes the panel, sees few results, and reports missing records. A row of chips showing what is active resolves that entirely.

**Should filters apply immediately or on submit?**

Immediately where the result is fast and the set is small enough to re-query cheaply, because seeing the effect teaches what the filter does. On submit where each query is expensive or several filters are usually set together, in which case show the pending state clearly and never leave it ambiguous.

**Should filters be in the URL?**

Yes, along with sort and page. Without it a filtered view cannot be shared with a colleague, survives neither refresh nor the back button, and cannot be reopened where somebody left off. In an internal tool this single omission generates a steady stream of daily friction.

**What is the difference between filtering and searching?**

Filtering narrows by known attributes — status, owner, date range — and the available values are enumerable. Search matches free text against content and the query is open. Most products need both, and offering only search for something that is really an attribute forces people to guess your vocabulary.

**How do you handle a filter that returns nothing?**

With a distinct state that says a filter is active, shows which ones, and offers to clear them. It must not show the first-run empty state, because somebody with nine thousand records being told how to create their first one is a confusing failure.

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