How Can JavaScript Add an 'Active' Class to Navigation Links Based on the Current URL?

Adding Active Navigation Class Based on URL: A Guide with JavaScript

Navigating complex websites requires users to efficiently identify the current page within the menu structure. To enhance user experience, adding an active class to the navigation item corresponding to the current page upon page load is crucial.

The provided JavaScript code unfortunately does not achieve this goal because it responds to user clicks, not page loads. To address this, we need to execute JavaScript that inspects the current page URL and dynamically adds the active class to the appropriate menu item.

Here's a revised JavaScript block that accomplishes this task:

$(function(){
    var current = location.pathname;
    $('#nav li a').each(function(){
        var $this = $(this);
        // if the current path is like this link, make it active
        if($this.attr('href').indexOf(current) !== -1){
            $this.addClass('active');
        }
    })
})

This code leverages jQuery to iterate through each menu item's link and compare its href attribute to the current page's pathname. Upon match, the active class is added to the corresponding link.

By utilizing proper JavaScript execution and logical comparisons, we can elegantly add the active class to the correct navigation item, improving website navigation clarity.

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