browser - JavaScript to detect if the parent frame is of the same origin? - Stack Overflow

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I'm looking for a cross-browser way to detect whether the parent frame is the same origin as my frame, preferably without printing warnings on the JavaScript error console.

The following seems to work but I'd like to avoid printing errors to the console (at least Safari and Chrome do when accessing location.href on the parent frame. Firefox throws an exception which can be caught):

function parentIsSameOrigin() {
    var result = true;
    try {
        result = window.parent.location.href !== undefined;
    } catch (e) {
        result = false;
    }
    return result;
}

I'm looking for a cross-browser way to detect whether the parent frame is the same origin as my frame, preferably without printing warnings on the JavaScript error console.

The following seems to work but I'd like to avoid printing errors to the console (at least Safari and Chrome do when accessing location.href on the parent frame. Firefox throws an exception which can be caught):

function parentIsSameOrigin() {
    var result = true;
    try {
        result = window.parent.location.href !== undefined;
    } catch (e) {
        result = false;
    }
    return result;
}

• javascript
• browser
• same-origin-policy

Share Improve this question Follow asked Apr 5, 2010 at 0:13 tlrobinsontlrobinson 2,85844 gold badges3333 silver badges3535 bronze badges

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3 Answers 3

Sorted by: Reset to default 11

I would do something like:

var sameOrigin;
try
{
    sameOrigin = window.parent.location.host == window.location.host;
}
catch (e)
{
    sameOrigin = false;
}
return sameOrigin;

I use this method to tell if an iframe contains local content,

but you can pass it window.top from the iframe just as well

function islocal(win){
var H=location.href,
    local= H.substring(0, H.indexOf(location.pathname));
    try{
        win=win.document;
        return win && win.URL && win.URL.indexOf(local)== 0;
    }
    catch(er){
        return false
    }
}

//test case alert(islocal(window.top))

Try this:

function parentIsSameOrigin()
{
    var result = true;
    if (window.parent)
    {
        result = Boolean
        (
            // more precise modifications needed here
            window.this.location.href.indexOf(window.parent.location.href) == 0
        );
    }
    return result;
}

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