@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/[email protected]/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 | | isActive | function | null | A callback method that's called with the current menuItem and 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