@sidsbrmnn/scrollspy

A simple lightweight JavaScript library without jQuery or any other dependencies to handle scroll spying on static webpages.

Install

1. via NPM

   Install it using npm

   npm install --save @sidsbrmnn/scrollspy

2. Use the minified script from unpkg.com

   <script src="https://unpkg.com/@sidsbrmnn/scrollspy@1.x/dist/scrollspy.min.js"></script>

Usages

Easy for using, syntax just like this:

scrollSpy(menu, options)

This little plugin will add active class into your existing menu item when you scroll your page to a matched section by ID. If you are giving it a try, make sure that you:

1. Added CSS for active class in your menu item. Because, this plugin do NOT include CSS.

2. Create your sections.

   Example: <section id="first-section">...</section>

3. Added an attribute which is an section ID into your menu items. Default is href.

   Example: "href"="#first-section". You also replace href with the other name by hrefAttribute in options.

Arguments

1. The menu is query selector to your menu. It is string or HTMLElement instance.

2. The options is optional. It is type of object which contains properties below:

Name	Type	Default	Description
sectionSelector	string	section	Query selector to your sections
targetSelector	string	a	Element will be added active class
offset	number	0	Offset number
hrefAttribute	string	href	The menu item's attribute name which contains section ID
activeClass	string	active	Active class name will be added into targetSelector
onActive	function	null	A callback method that's called with the current menuItem and section onActive: function(menuItem, section) {}

ES6

import scrollSpy from '@sidsbrmnn/scrollspy'

const options = {
    sectionSelector: 'section',  // Query selector to your sections
    targetSelector: '.nav-link', // Query selector to your elements that will be added `active` class
    offset: 100                  // Menu item will active before scroll to a matched section 100px
}

// Initialize
scrollSpy(document.getElementById('navMain'), options)

// Shorter way
scrollSpy('#navMain', options)

Script tag

<script src="/path/to/dist/scrollspy.min.js"></script>
<script>
    window.onload = function () {
        scrollSpy('#navMain', {
            sectionSelector: 'section',
            targetSelector: '.nav-link',
            offset: 100
        });
    }

</script>

Licence

MIT