5,752
2015-08-15 03:15:14
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.
This seems to work fine in Firefox. Does it work in other browsers too?
Having a page with an iframe within an iframe, to test from my child iframe if my parent iframe was embeded in the page, I used if (parent === top)
@sglessard If the child page and parent are from different domains then Firefox will complain for Same Origin Policy (www.w3.org/Security/wiki/Same_Origin_Policy) and code won't work
This works in IE 11, 10, and 9 for me. Also it works in FF and Opera as well as, of course, Chrome. I haven't run into any issues with it.
For those still rocking the latest in 1995 tech,
window.self !== window.topreturnstruewhen run from within contents offrame, oriframe.