How Can I Determine if a Webpage is Loaded in an iFrame or a Browser Window?

Determining if a Webpage is Loaded in an iFrame or Browser Window

When developing an iframe-based application, it becomes necessary to distinguish whether the webpage is loaded within an iframe or directly in the browser window. This understanding enables tailored functionality for different scenarios.

Detecting the Loading Context

The approved approach involves utilizing the window.self and window.top properties:

const inIframe = () => window.self !== window.top;

window.self refers to the current window object, while window.top refers to the top-level window. If these two objects are not identical, it indicates that the webpage is loaded within an iframe.

Addressing Browser Compatibility

In recent browsers, this method is widely supported, allowing for accurate iframe detection. However, caution is advised when dealing with older browsers, as some may block access to window.top due to security restrictions.

Alternative Approach

To account for browser inconsistencies, an alternative approach involves using a try-catch block:

function inIframe () {
    try {
        return window.self !== window.top;
    } catch (e) {
        return true;
    }
}

If access to window.top is denied, the catch block will catch the exception and return true, indicating that the webpage is likely loaded within an iframe.

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