---
title: Trigger changed
order: 11
---

trigger 动态发生变化的时候需要能够准确获取

```jsx
import { useState, useEffect } from 'react';
import Overlay from '@alifd/overlay';

const { Popup } = Overlay;

const style = {
  width: 400,
  height: 100,
  padding: 10,
  background: '#fff',
  borderRadius: 2,
  boxShadow: '2px 2px 20px rgba(0, 0, 0, 0.15)',
};

const overlay = <span style={style}>Hello World From Popup!</span>;

const DyncButton = (props) => {
  const [disabled, setDisabled] = useState(true);

  useEffect(() => {
    setTimeout(() => {
      setDisabled(false);
    }, 100);
  }, []);

  if (disabled) {
    return (
      <span>
        <button {...props} disabled>
          Disabled button
        </button>
      </span>
    );
  }

  return <button {...props}>Open</button>;
};

const Demo = () => {
  return (
    <div>
      <Popup overlay={overlay} triggerType="click">
        <DyncButton />
      </Popup>
    </div>
  );
};

ReactDOM.render(<Demo />, mountNode);
```