Is My Webpage Loaded Inside an iFrame or Directly in the Browser?

Determining Webpage Load Location: Inside an iFrame or Directly in the Browser

Web developers often face the challenge of loading a webpage into an iframe or directly into the browser window. Identifying the load location is crucial for tailored user experiences.

In this scenario, a Facebook app developer seeks to determine whether a webpage is loaded within an iframe or directly in the browser. This knowledge enables them to render the page accordingly for both environments.

Solution:

The previous solution utilized the following code:

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

However, this method has limitations due to browser security restrictions. A more reliable approach is recommended:

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

This improved code checks if the current window is the top-level window by comparing window.self and window.top. A non-equivalent comparison indicates an iframe environment. This method is widely supported by modern browsers.

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