How Can I Dynamically Change a Website's Favicon Using JavaScript?

Changing Website Favicon Dynamically

In the realm of web development, customizing the user experience often involves aligning the website's appearance with the logged-in user's preferences. One aspect that may need customization is the website's favicon. This tiny but impactful icon represents the brand in browser tabs and bookmarks.

Dynamically Changing the Favicon

The task of dynamically changing the favicon based on the private label arises as a challenge. You may have envisioned a solution that involves storing a set of icons and referencing the appropriate one during HTML page generation.

JavaScript to the Rescue

Thankfully, there's a straightforward JavaScript solution to this problem:

var link = document.querySelector("link[rel~='icon']");
if (!link) {
    link = document.createElement('link');
    link.rel = 'icon';
    document.head.appendChild(link);
}
link.href = 'https://stackoverflow.com/favicon.ico';

In this code:

• document.querySelector locates the existing element with a rel attribute containing the string "icon".
• If no such element is found, a new element is created, and its rel attribute is set to "icon".
• The newly created or retrieved element is appended to the of the document.
• Finally, the href attribute of the element is set to the desired favicon image's URL.

By dynamically updating the href attribute, you can switch the favicon displayed in the browser tab or bookmark. This effectively customizes the user experience by aligning the website's branding with the active user's preferences.

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