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A JavaScript library to make navigation menus highlight the item based on currently in view section.

  • No dependencies
  • Easy to use
  • Lightweight and fast


Include MenuSpy

<script src="menuspy.js"></script>

MenuSpy will be available in the global scope.

You can also use NPM / Yarn to install it and then require it as a module.


npm install menuspy


yarn add menuspy

Require the module:

var MenuSpy = require('menuspy');

Example of menu element:

<header id="main-header">
      <li><a href="#features">Features</a></li>
      <li><a href="#usage">Usage</a></li>
      <li><a href="#options">Options</a></li>
      <li><a href="#examples">Examples</a></li>

You can also use data-target on the anchor element with a selector. Example:

<a href="#anything" data-target="selector">Anything</a>

Initialize the plugin on your menu element.

var elm = document.querySelector('#main-header');
var ms = new MenuSpy(elm);

The MenuSpy() constructor accepts two arguments: the container element and an options object.


Option Type Default Description
menuItemSelector String a[href^="#"] Menu items selector.
activeClass String active Class applied on menu item relative to the currently visible section.
threshold Integer 15 Amount of space between your menu and the next section to be activated.
enableLocationHash Boolean true Enable or disable browser's hash location change.
hashTimeout Integer 600 Timeout to apply browser's hash location.
callback Function function(currentItem) {} A function to be called every time a new menu item activates.