Fixed-sticky: a CSS position:sticky polyfill

• (c)2013 @zachleat, Filament Group
• MIT license

Explanation

CSS position:sticky is really in its infancy in terms of browser support. In stock browsers, it is currently only available in iOS 6. In Chrome you can enable it by navigating to chrome://flags and enabling experimental “WebKit features” or “Web Platform features” (Canary).

Usage

Just qualify element you’d like to be position:sticky with a fixedsticky class.

<div id="my-element" class="fixedsticky">

Add your own CSS to position the element. Supports any value for top or bottom.

.fixedsticky { top: 0; }

Next, add the events and initialize your sticky nodes:

$( '#my-element' ).fixedsticky();

See demo.html for an example.

Native position: sticky Caveats

• iOS (and Chrome) do not support position: sticky; with display: inline-block;.
• sticky elements are constrained to the dimensions of their parents.
• This plugin (and Chrome’s implementation) does not (yet) support use with thead and tfoot.

Using the polyfill instead of native

If you’re having weird issues with native position: sticky, you can tell fixed-sticky to use the polyfill instead of native. Just override the sticky feature test to always return false.

// After fixed-sticky.js
FixedSticky.tests.sticky = false;

Installation

Use the provided fixedsticky.js and fixedsticky.css files.

Also available in Bower

bower install filament-sticky

Browser Support

These tests were performed using fixed-sticky with fixed-fixed. It’s safest to use them together (position:fixed is a minefield on older devices), but they can be used independently.

Native Sticky

• iOS 6.1

Polyfilled

• Internet Explorer 7, 8, 9, 10
• Firefox 24
• Chrome 29
• Safari 6.0.5
• Opera 12.16
• Android 4.X

Fallback (static positioning)

• Android 2.X
• Opera Mini
• Blackberry OS 5, 6, 7
• Windows Phone 7.5

TODO

• Tests (of course). I have a serious case of developer guilt releasing this without tests.
• Add support for table headers.
• Method to unbind scroll/resize events.
• Vanilla JS version.

Release History

• v0.1.0: Initial release.