scrollSpy

A simple scroll spy

Building the Project

• Dependencies: node, (ruby) sass*, gulp
• To start run npm install, git submodule init and git submodule update.
• gulp will build the site
• gulp watch will set-up watch, watchify, browser-sync
• gulp prod will build the site with minified/uglified/optimized assets

*Sass is only there to build the demo page. You can remove it all if you like.

Example

// require('./matchMedia'); // only necessary if using a media query in options & want deeper support

scrollSpy({
	nav: '#pageNav',
	stickyNav: true
});

Settings

Options	Type	Default	Description
nav	string or jQuery obj	null	Selector for your entire nav container, probably a <nav> or <ul>
navLinks	string	'[href^="#"]'	The links that will be controlling this thing
stickyClass	string	'is-sticky'	Class that's applied to your nav when it's off the page. You probably want to set position: fixed; at this point.
scrollDuration	number	500	How long do you want the animated scrolls to take
activeClass	string	is-active	Class that's applied to the nav item that's the current position on the page.
stickyNav	boolean	false	Do you want me to toggle the stickyClass when the nav is on/off the page
title	string or jQuery obj	null	Do you need to update something to the title of the link when it's the current position?
disableScrollToAnchor	boolean or string	false	True will disable animated scrolls between anchors. A media query will disable it accordingly (Ex. (min-width: 768px)). Remember to use a matchMedia polyfill if you need that support.
disableScrollSpy	boolean or string	false	True will basically disable the whole point of this thing. The string is a media query, refer to above.
classOnTarget	boolean	false	Adds active class to current active target (not the anchor)

Callbacks

Name	Params	Description
onScrollCb	scrollPosition: num, navHeight: num	Fired on scroll. Not debounced or throttled. Will not be disabled by disableScrollSpy option.
onChangeCb	lastId: string, id: string, scroll: num, navHeight: num	Fired when current section changes. LastId is the previous one. id is the new one.
onClickCb	el: jquery obj of item clicked, disabled: whether or not disableScrollToAnchor is on	Fired when nav item is clicked

Known Issues

Your last item needs to be tall enough to ensure that it triggers the scroll spy. It can probably be a touch more intelligent about how it works but consider adjusting your design to better suit this.