ant-design/components/input-number/demo/focus.tsx

import React, { useRef } from 'react';
import { Button, InputNumber, Space } from 'antd';
import type { InputNumberRef } from 'rc-input-number';

const App: React.FC = () => {
  const inputRef = useRef<InputNumberRef>(null);

  return (
    <Space direction="vertical" style={{ width: '100%' }}>
      <Space wrap>
        <Button
          onClick={() => {
            inputRef.current!.focus({
              cursor: 'start',
            });
          }}
        >
          Focus at first
        </Button>
        <Button
          onClick={() => {
            inputRef.current!.focus({
              cursor: 'end',
            });
          }}
        >
          Focus at last
        </Button>
        <Button
          onClick={() => {
            inputRef.current!.focus({
              cursor: 'all',
            });
          }}
        >
          Focus to select all
        </Button>
        <Button
          onClick={() => {
            inputRef.current!.focus({
              preventScroll: true,
            });
          }}
        >
          Focus prevent scroll
        </Button>
      </Space>
      <InputNumber style={{ width: '100%' }} defaultValue={999} ref={inputRef} />
    </Space>
  );
};

export default App;