How to identify if a webpage is being loaded insid

Question

I am writing an iframe based facebook app. Now I want to use the same html page to render the normal website as well as the canvas page within facebook. I want to know if I can determine whether the page has been loaded inside the iframe or directly in the browser?

Answer 1

The accepted answer didn't work for me inside the content script of a Firefox 6.0 Extension (Addon-SDK 1.0): Firefox executes the content script in each: the top-level window and in all iframes.

Inside the content script I get the following results:

 (window !== window.top) : false 
 (window.self !== window.top) : true

The strange thing about this output is that it's always the same regardless whether the code is run inside an iframe or the top-level window.

On the other hand Google Chrome seems to execute my content script only once within the top-level window, so the above wouldn't work at all.

What finally worked for me in a content script in both browsers is this:

 console.log(window.frames.length + ':' + parent.frames.length);

Without iframes this prints 0:0, in a top-level window containing one frame it prints 1:1, and in the only iframe of a document it prints 0:1.

This allows my extension to determine in both browsers if there are any iframes present, and additionally in Firefox if it is run inside one of the iframes.

Answer 2

I'm using this:

var isIframe = (self.frameElement && (self.frameElement+"").indexOf("HTMLIFrameElement") > -1);

Answer 3

Browsers can block access to window.top due to same origin policy. IE bugs also take place. Here's the working code:

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

top and self are both window objects (along with parent), so you're seeing if your window is the top window.

Answer 4

Use this javascript function as an example on how to accomplish this.

function isNoIframeOrIframeInMyHost() {
// Validation: it must be loaded as the top page, or if it is loaded in an iframe 
// then it must be embedded in my own domain.
// Info: IF top.location.href is not accessible THEN it is embedded in an iframe 
// and the domains are different.
var myresult = true;
try {
    var tophref = top.location.href;
    var tophostname = top.location.hostname.toString();
    var myhref = location.href;
    if (tophref === myhref) {
        myresult = true;
    } else if (tophostname !== "www.yourdomain.com") {
        myresult = false;
    }
} catch (error) { 
  // error is a permission error that top.location.href is not accessible 
  // (which means parent domain <> iframe domain)!
    myresult = false;
}
return myresult;
}

Answer 5

It's an ancient piece of code that I've used a few times:

if (parent.location.href == self.location.href) {
    window.location.href = 'https://www.facebook.com/pagename?v=app_1357902468';
}

Answer 6

Write this javascript in each page

if (self == top)
  { window.location = "Home.aspx"; }

Then it will automatically redirects to home page.