Prevent access to website depending on wheter or not it is viewed trough an iframe

Question

I have a website(website a) that has only one Page, which i want to show on a different website(website b) via iframe. But I want to prevent the access to website a.

Basicly what i want to do is this:

if (load website trough iframe == true){
         show website;
    }
else{
         don't open website;
     }

Anyone has a clue where to start to solve this problem?

Answer 1

Preventing access is a strong word. Here's how to check if you're in a frame or not.

if (window.frameElement) {
  // in frame
}
else {
  // not in frame... redirect to another page?
}

Answer 2

Browser will not provide access to window.top method. So you can use the following code to detect whether the website is running in an Iframe or Browser

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

Now you can do this:

if (isInIframe()){
    document.write("Show Website");
}
else{
    document.write("Don't Show Website");
}