# `react-doctor/no-focus-in-animation-completion-handler`

Focus waits for animation completion

- **Category:** Accessibility
- **Severity:** warn
- **Source:** oxlint-plugin-react-doctor
- **Framework:** global
- **Enabled when:** always

## Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches `react-doctor/no-focus-in-animation-completion-handler`. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

## Compare the code

The corrected pattern shows a focused way to address the diagnostic.

### Reported pattern

```tsx
import { useRef } from "react";
const Dialog = () => {
  const inputRef = useRef(null);
  return <>
    <input ref={inputRef} />
    <div onAnimationEnd={() => inputRef.current.focus()} />
  </>;
};
```

### Corrected pattern

```tsx
const Dialog = ({ isOpen }) => {
  const inputRef = useRef(null);
  useEffect(() => {
    if (isOpen) inputRef.current?.focus();
  }, [isOpen]);
  return <input ref={inputRef} />;
};
```

## How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

### Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

````text
Fix every confirmed `react-doctor/no-focus-in-animation-completion-handler` diagnostic in the current repository.

Required change:
- Move focus when interaction state changes, not when animation completes. Reduced or canceled motion must not block focus.

Reference transformation:

Before:
```tsx
import { useRef } from "react";
const Dialog = () => {
  const inputRef = useRef(null);
  return <>
    <input ref={inputRef} />
    <div onAnimationEnd={() => inputRef.current.focus()} />
  </>;
};
```

After:
```tsx
const Dialog = ({ isOpen }) => {
  const inputRef = useRef(null);
  useEffect(() => {
    if (isOpen) inputRef.current?.focus();
  }, [isOpen]);
  return <input ref={inputRef} />;
};
```

Constraints:
- Confirm the reported code matches the Before pattern.
- Make the smallest change that fixes the root cause.
- Preserve behavior and interfaces unrelated to this diagnostic.
- Reuse existing project components, utilities, and conventions.
- Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations.
- Use existing brand assets, product facts, content, and design tokens.
- Do not invent claims, customer data, typefaces, or artwork.
- Preserve accessible names, focus order, keyboard behavior, and touch access not targeted by this rule.
- Adapt identifiers and framework details instead of copying blindly.
- Do not disable the rule or suppress matching code.

Verification:
- Run focused tests for the changed behavior.
- Run React Doctor and confirm this diagnostic no longer appears.
- Report the files changed and any checks you could not run.
````