Affix

Wrap Affix around another component to make it stick the viewport.

When To Use#

On longer web pages, it's helpful to stick component into the viewport. This is common for menus and actions.

Please note that Affix should not cover other content on the page, especially when the size of the viewport is small.

Examples

Basic

The simplest usage.

TypeScript
JavaScript
import React, { useState } from 'react';
import { Affix, Button } from 'antd';

const Demo: React.FC = () => {
  const [top, setTop] = useState(10);
  const [bottom, setBottom] = useState(10);

  return (
    <>
      <Affix offsetTop={top}>
        <Button type="primary" onClick={() => setTop(top + 10)}>
          Affix top
        </Button>
      </Affix>
      <br />
      <Affix offsetBottom={bottom}>
        <Button type="primary" onClick={() => setBottom(bottom + 10)}>
          Affix bottom
        </Button>
      </Affix>
    </>
  );
};

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

Container to scroll.

Set a target for 'Affix', which is listen to scroll event of target element (default is window).

TypeScript
JavaScript
import React, { useState } from 'react';
import { Affix, Button } from 'antd';

const Demo: React.FC = () => {
  const [container, setContainer] = useState<HTMLDivElement | null>(null);
  return (
    <div className="scrollable-container" ref={setContainer}>
      <div className="background">
        <Affix target={() => container}>
          <Button type="primary">Fixed at the top of container</Button>
        </Affix>
      </div>
    </div>
  );
};

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

Callback

Callback with affixed state.

TypeScript
JavaScript
import { Affix, Button } from 'antd';

ReactDOM.render(
  <Affix offsetTop={120} onChange={affixed => console.log(affixed)}>
    <Button>120px to affix top</Button>
  </Affix>,
  mountNode,
);

API#

Property	Description	Type	Default
offsetBottom	Offset from the bottom of the viewport (in pixels)	number	-
offsetTop	Offset from the top of the viewport (in pixels)	number	0
target	Specifies the scrollable area DOM node	() => HTMLElement	() => window
onChange	Callback for when Affix state is changed	(affixed?: boolean) => void	-

Note: Children of Affix must not have the property position: absolute, but you can set position: absolute on Affix itself:

<Affix style={{ position: 'absolute', top: y, left: x }}>...</Affix>

FAQ#

When binding container with `target` in Affix, elements sometimes move out of the container.#

We only listen to container scroll events for performance consideration. You can add custom listeners if you still want to: https://codesandbox.io/s/2xyj5zr85p

Related issues：#3938 #5642 #16120

When Affix is used in a horizontal scroll container, the position of the element `left` is incorrect.#

Affix is generally only applicable to areas with one-way scrolling, and only supports usage in vertical scrolling containers. If you want to use it in a horizontal container, you can consider implementing with the native position: sticky property.

Related issues：#29108