How Can I Access the Parent URL from an iframe When It's on a Different Subdomain?

Accessing Parent URL from iframe: Limitations and Alternative Solutions

Accessing the URL of the parent page from an iframe poses limitations when the iframe and the main page reside on different subdomains. Despite being on the same domain, subdomains are treated as distinct entities for security reasons, preventing cross-frame access.

Accessing Parent URL from Same Subdomain

If both the parent page and iframe reside on the same subdomain, one can use the following approach to retrieve the parent page's URL:

parent.window.location.href

Using Alternative Methods

However, when dealing with different subdomains, a viable alternative method is available for situations where only the main page's URL is necessary:

var url = (window.location != window.parent.location)
            ? document.referrer
            : document.location.href;

Explanation

• window.parent.location: This expression provides the location of the parent page, but it may cause a security error when accessing the href property.
• document.referrer: This property returns the URI of the page that linked to the iframe. While it may not always return the containing document, it provides a fallback option.
• document.location: This object represents the current document's URL. If the iframe and parent page are on the same subdomain, the href property can be used.

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