# FeatureFilter

Auto-generated from the config schema in the source — see the [config guide](https://jbrowse.org/jb2/docs/config_guide) for concepts. Built into JBrowse core. [View source](https://github.com/GMOD/jbrowse-components/blob/main/packages/display-kit/src/featureFilterConfigSchema.ts).

The tests a feature display applies to the records it fetched, its `filter`
slot. A display that adds more tests extends this schema. A list is
shorthand for `{ expressions: [...] }`, and a settings bag names the members
one by one.

## Example usage

```js
{ type: 'LinearBasicDisplay', filter: ["jexl:feature.score > 100"] }
```

## Related links

- **Extended by:** [BasicFeatureFilter](../basicfeaturefilter)
- **Extended by:** [VariantFilter](../variantfilter)

## Config slots

A setting written to it names members one by one: a member left out stays as it is, and `null` resets one. Slot types (`fileLocation`, `frozen`, ...) are explained in the [config slot types reference](https://jbrowse.org/jb2/docs/config_guides/slot_types). Slots a base configuration contributes are listed here too, so this table is the whole surface.

| Slot | Description |
| --- | --- |
| **expressions**<br>[`expressionArray`](https://jbrowse.org/jb2/docs/config_guides/slot_types#expressionarray) = <code>[]</code> | The features the display admits: a feature is drawn when every expression holds. Each entry is a `jexl:` expression over `feature`. The "Filter by..." dialog and "Edit plot..." edit this list, and "Clear all filters" returns it to what the track's config declares. |