README.md

react-sticky-el

Sticky library for React.

Demos

• Basic

Installation

npm install react-sticky-el

Overview & Basic Example

The elements you actually want to "stick" should be wrapped in the <Sticky /> tag. The full list of props are available below, but typical usage will look something like so:

app.jsx

import React, {Component} from 'react';
import Sticky from 'react-sticky-el';
...

class App extends Component ({
  render() {
    return (
      ...
        <Sticky>
          <header>
            ...
          </header>
        </Sticky>
      ...
    );
  },
});

This will be rendered as:

    <div> <!-- holder element -->
        <div> <!-- wrapper element -->
            <header>
                ...
            </header>
        </div>
    </div>

'Sticky' will be - wrapper element, holder element is used to reserve space in DOM when holder element has 'fixed' position.

When the "stickiness" becomes activated, the following inline style rules are applied to the Sticky element:

  position: fixed;
  top: 0;
  left: 0;
  width: <width that was before 'stickiness'>

Note that the calculation of the Sticky element's height does not currently take margins into account. If you have margins on this element it may result in unexpected behavior.

<Sticky /> Props

mode (default: 'top')

'top' or 'bottom' - to which side element should stick

wrapperCmp (default: 'div')

Anything that can used by React.createElement. Used for wrapper element. If you want to use some custom component, please be sure that you don't lose style and className props.

holderCmp (default: 'div')

Anything that can used by React.createElement. Used for holder element. If you want to use some custom component, please be sure that you don't lose style and className props.

holderProps (default: {})

These props will be used to create holderElement.

boundaryElement (default: null)

Selector to define a boundaryElement. It should be one of the parents of the current element.

Loot at the Basic Demo for an example.

scrollElement (default: window)

Selector to define a scrollElement. All position checks will be performed according to this element, also it will be listened for 'scroll' event.

It should be one of the parents of the current element. Possible selectors: 'body', 'window', '#{id}', anything suitable for Element.matches.

Loot at the Basic Demo for an example

app.jsx

import React, {Component} from 'react';
import Sticky from 'react-sticky-el';
...

class App extends Component ({
  render() {
    return (
      <div>
        <p>....</p>  
        <div className="scrollarea" style={{height: '200px', overflow: 'scroll'}}>
          <Sticky scrollElement=".scrollarea">
            <h1>Scroll pane</h1>
          </Sticky>
        </div>
        <p>....</p>
      </div>
    );
  },
});

positionRecheckInterval (default: 0)

If your DOM structure is mutating (you are adding/removing elements), it will be usefull to provide positionRecheckInterval greater than zero, in this case position check will be also performed using setInterval in addition to scroll events.

stickyStyle (default: {})

In the event that you wish to override the style rules applied, simply pass in the style object as a prop:

app.jsx

  <Sticky stickyStyle={customStyleObject}>
    <header />
  </Sticky>

Note: You likely want to avoid messing with the following attributes in your stickyStyle: left, top, and width.

stickyClassName (default: 'sticky')

You can also specify a class name to be applied when the element becomes sticky:

app.jsx

  ...
  <Sticky stickyClassName={customClassName}>
    <header />
  </Sticky>
  ...

topOffset (default: 0)

Sticky state will be triggered when the top of the element is topOffset pixels from the top of the scrollElement. Positive numbers give the impression of a lazy sticky state, whereas negative numbers are more eager in their attachment (check .

app.jsx

  ...
  <Sticky topOffset={80}>
    <SomeChild />
  </Sticky>
  ...

Loot at the Basic Demo for an example

bottomOffset (default: 0)

Sticky state will be triggered when the bottom of the element is bottomOffset pixels from the bottom of the scrollElement.

app.jsx

  ...
  <Sticky bottomOffset={80}>
    <SomeChild />
  </Sticky>
  ...

Loot at the Basic Demo for an example

hideOnBoundaryHit (default: true)

If false then boundaryEl should have position: relative. In this case sticky element won't disappear on reaching it's boundaries.

Loot at the Basic Demo for an example

Other props

All other props (such as className, style, etc..) will be applyed to the holder element

License

MIT