# getColumnFilterInstance

Queries a column's custom filter instance. May return null if absent or not yet created.

Canonical: https://grid.syidax.com/docs/methods/getColumnFilterInstance/

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## What does this API do?

Queries a column's custom filter instance. May return null if absent or not yet created.

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## Exact input and result types

```typescript
getColumnFilterInstance<TColumnValue = unknown, TModel = unknown>(columnId: string): Promise<
    GridFilterInstance<GridData, TColumnValue, TModel, unknown> | null
  >
```

| Arguments | Required | Type |
| --- | --- | --- |
| columnId | Required | string |

The return type is `Promise<
    GridFilterInstance<GridData, TColumnValue, TModel, unknown> | null
  >`.

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## Usage flow

After registering and initializing the Grid element, call grid.getColumnFilterInstance(…). Read the return value with await. For methods returning a boolean or report, inspect the result before continuing.

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## Read related types

- [GridFilterInstance](https://grid.syidax.com/docs/types/GridFilterInstance.md)
- [GridData](https://grid.syidax.com/docs/types/GridData.md)

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## Feature explanations and examples

- [Conditions for each column](https://grid.syidax.com/docs/features/column-filters.md) — Column filters apply conditions to individual columns. Text, numbers, and dates use different inputs and comparisons; conditions across columns narrow results together.