Filter input

Overview

An input that provides suggestions through qualifiers and highlights complex filter syntax.

Anatomy

Content

Icon

A filter input allows free form text searching as well as using qualifiers to narrow down your search. The filter input always supports free form text search. This is why you should use the search icon as a leading visual. A filter icon could give the impression that free form text search isn't available.

Do

Use the search icon in a filter input.

Don’t

Don't use a filter icon in a filter input.

Submit

There are two ways this component can trigger submission of the input value.

1. Provide a search button next to the filter input
2. Auto update results as the value changes

Clear button

The clear button only appears when there is at least one character entered in the input. When the input is empty the clear button disappears again.

Do

Hide the clear button when the input is empty.

Don’t

Don't show the clear button when the input is empty.

Use an icon instead of a link for clearing the input. This avoids confusion with the value of the input. Especially when the input has a long value that gets close to the clear button a link could be problematic.

Do

Use a circular clear button with an x icon to clear the input.

Don’t

Don't use a link for clearing as this could be confused with the text inside the input.

Sorting

There are two different states that should be considered when providing suggestions:

1. Default: You've entered a matching qualifier and get default suggestions. For example: author:.
2. Narrow down: You've entered a value after your qualifier to narrow down the suggestions. For example: author:max

We should always strive to provide as relevant results as possible when dealing with user, organization, repository, issue, pull request items. This can be done through a mix of considerations:

1. Objects you've interacted with
2. Organizations you're part of and it's members
3. Repositories you're part of and it's members
4. Approximate string matching (fuzzy)

Let's take the author: as an example. While in the default state we aren't searching through the authors and want to provide a default list with users. It's crucial we make the suggestions as relevant as possible therefore we rank them based on how often/recently you've interacted with them.

Once we start narrowing down those results by using author:max we enter the narrow down state and apply approximate string matching on those suggestions. In this case we still rank users that I've recently interacted with or that are part of my organization/repositories higher.

Not all our infrastructure supports this logic yet. If not available we fall back on alphabetical ordering.

For static items that only return a handful of suggestions we often can just order items through common sense:

Qualifiers

The filter input comes with a list of predefined qualifiers and prestyled suggestions. This ensures everyone aligns on the same qualifiers as well as on the styling of suggestions.

Even though custom qualifiers can be added it's important to check if your new qualifier could fit in one of the predefined qualifiers below.

⚠️ This list will change a lot over the next month to accomodate different teams.

Generics

The state: qualifier has multiple variants to improve the experience for specific items:

• state: For both pull requests and issues (no icons)
• state-pr: For only pull requests (with icons)
• state-issue: For only issues (with icons)

Therefore it's important to use the correct qualifier as soon as you can determine if you're filtering to pull requests or issues.

Do

Use the `state-pr` variant when filtering pull requests.

Don’t

Don't use the `state` variant when filtering pull requests.

Highlighting

If invalid values are used we don't show highlighting.

While this applies to all qualifiers we do understand that for the ones that depend on our api endpoints (users, repositories, organisations...) we can't always accurately match every result and therefore while not ideal we always highlight those. For example when not single signed-on to a organisation some repositories might not be returned. Also consider that users might copy paste strings containing qualifiers. In this case you need to run through every qualifier to set the highlight if needed.

Do

Remove highlighting on values when they are invalid.

Don’t

Don't show highlighting on invalid values.

No matches

When no matches are found we stop suggesting items through the popover and don't show anything. In rare cases the user could be searching for format:format within the content of items they are filtering to and this will still allow them to do so.

Do

Stop suggesting if no matches are found.

Don’t

Don't show an empty state when no matches are found.

Values with spaces

Some qualifiers like location: might have values which contain spaces. eg: 'Amsterdam, Netherlands'. In this case we encapsulate the value between straight quotes (not smart quotes).

Without this it would be hard for the parser to understand where the value ends.

Do

Use straight quotes around values with spaces.

Don’t

Don't use values with spaces without quotes.

Deprecate where possible

There are many qualifiers on our platform that could be unified or deleted. For example type: can now be replaced by is:. Remember that deprecating means that we stop suggesting those options to users but we still keep them available in the backend until we see usage declining to low volumes.

Do

Use a predefined qualifier where possible.

Don’t

Use a custom qualifiers instead of a predefined one.

Formatting

Always list qualifiers in a readable way and don't include all their options by using descriptions. We do this to ensure that qualifiers are easy to scan and have enough context.

Do

List qualifiers in a readable way and without their options.

Don’t

Don't list qualifiers as their raw value with possible options.

Options

Size

Filter inputs can have 3 different sizes:

• Small (28px)
• Medium (32px) (default)
• Large (40px)