How to identify if a webpage is being loaded inside an iframe or directly into the browser window?

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攒了一身酷
攒了一身酷 2020-11-22 00:28

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

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  •  臣服心动
    2020-11-22 01:04

    RoBorg is correct, but I wanted to add a side note.

    In IE7/IE8 when Microsoft added Tabs to their browser they broke one thing that will cause havoc with your JS if you are not careful.

    Imagine this page layout:

    MainPage.html
      IframedPage1.html   (named "foo")
      IframedPage2.html   (named "bar")
        IframedPage3.html (named "baz")
    

    Now in frame "baz" you click a link (no target, loads in the "baz" frame) it works fine.

    If the page that gets loaded, lets call it special.html, uses JS to check if "it" has a parent frame named "bar" it will return true (expected).

    Now lets say that the special.html page when it loads, checks the parent frame (for existence and its name, and if it is "bar" it reloads itself in the bar frame. e.g.

    if(window.parent && window.parent.name == 'bar'){
      window.parent.location = self.location;
    }
    

    So far so good. Now comes the bug.

    Lets say instead of clicking on the original link like normal, and loading the special.html page in the "baz" frame, you middle-clicked it or chose to open it in a new Tab.

    When that new tab loads (with no parent frames at all!) IE will enter an endless loop of page loading! because IE "copies over" the frame structure in JavaScript such that the new tab DOES have a parent, and that parent HAS the name "bar".

    The good news, is that checking:

    if(self == top){
      //this returns true!
    }
    

    in that new tab does return true, and thus you can test for this odd condition.

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