sticky

A simple Sticky library for React

Mar 21, 2021
A simple Sticky library for React

react-sticky-el

Sticky library for React.

View Demo View Github

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

disabled (default: false)

Allows you to disable sticking by setting this prop to true

onFixedToggle (default: null)

This handler will be called right before changing fixed state.

boundaryElement (default: null)

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

Look at these examples

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.

Look at the Demos 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

app.jsx

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

Look 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>

Look at the Basic Demo for an example

hideOnBoundaryHit (default: true)

If false then the sticky element won't disappear on reaching it's boundaries. A configuration like this is implemented below.

import Sticky from 'react-sticky-el'; <div className="block"> <Sticky boundaryElement=".block" hideOnBoundaryHit={false}> <SomeChild /> </Sticky> </div>

Look at the Basic Demo for an example.

Note: If the scrollareaElement is not at the top of the viewport, when the sticky element overflows it, it will stay visible. This can not be fixed with overflow: hidden because the sticky element has position: fixed and it's relative to the viewport. A solution is to use clip-path: inset(0 0 0 0); on the scrollareaElement. This may have unforeseen consequences with other styles in your app - use caution. You can see this happening in this example

dontUpdateHolderHeightWhenSticky (default: false)

Controls whenever the min-height for holder element should be updated when element becomes sticky or not. You can set it to true if the height of your sticky element changes when it becomes sticky (e.g. only some part of the header is visible when it's sticky) and you want to avoid your content jumping up.

Look at the Demo for an example.

Other props

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

Advanced usage

If you want to use some custom components and have more control, then you can use RenderPropSticky:

import { RenderPropSticky } from 'react-sticky-el'; function StickyHeader() { return ( <RenderPropSticky mode={mode} onFixedToggle={onFixedToggle} hideOnBoundaryHit={hideOnBoundaryHit} offsetTransforms={offsetTransforms} disabled={disabled} boundaryElement={boundaryElement} scrollElement={scrollElement} bottomOffset={bottomOffset} topOffset={topOffset} positionRecheckInterval={positionRecheckInterval} > {({ isFixed, wrapperStyles, wrapperRef, holderStyles, holderRef }) => ( <div {...rest} ref={holderRef} style={holderStyles}> <div {...rest} className={`${wrapperClassName} ${isFixed ? stickyClassName : ''}`} style={ isFixed ? { ...wrapperStyles, ...stickyStyles } : wrapperStyles } ref={wrapperRef} > <h1>I'm sticky!</h1> </div> </div> )} </RenderPropSticky> ) }
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