Develop Reference

How to get browser's current page URL from iframe?

Ok. This might have been asked several times but my problem is slightly different. I have following page tab in my facebook application:
Facebook Page Tab
This facebook page tab has my website embedded as iframe into it. What I want is that is to get the URL of current page inside my application.
For example, if you open above link you see facebook URL in your browser(obviously) address bar. In my iframe I just want to retrieve the URL of the parent page in which it is embedded.
I know same-origin policies in Javascript don't allow playing with cross-domain parent page's markup using javascript but I just want to retrieve the parent page URL, thats it.
Is that possible in ANY way?
Any way to access the address bar URL in my PHP application?
Thanks.

You probably don’t need the “actual URL”, but only the page id, I assume …? That you can get by decoding the signed_request parameter that gets POSTed to your app on initial load into the iframe.
How to “decode” it is described here, https://developers.facebook.com/docs/facebook-login/using-login-with-games#parsingsr
If you’re using the PHP SDK, that has a method already that does this for you.

You can use this to access it in JavaScript:
top.location.href
"top" is better than "parent". Because if your iframe is itself in another iframe then parent will return that iframe's location. "top" will return the highest location.

This will be a tough one, because CORS forbids to access the outside frame:
The referrer doesn't help very much either.
If you want to use the signed_request, and want to send custom data/parameters to your app, have a look at https://developers.facebook.com/docs/appsonfacebook/pagetabs#integrating
You can then fill the app_data parameter, and decode that in your app.

Try one of these:
parent.document.location
parent.window.document.location
parent.window.location
parent.document.location.href
I'm not sure if this will work on facebook though

Passing JS variable from child Iframe to parent JSP on cross sub domain

I am stuck at 1 location and need some help. I created two subdomains on apache tomcat server like domain1.localhost.com and domain2.localhost.com in server.xml. On domain1 I have a JSP that includes iFrame (hosted on domain2). How can we pass the JS variable from child Iframe to parent JSP and store it in local variable of JSP hosted on domain1.localhost.com?
I tried defining document.domain = "localhost" on both JSP but didn't work. Even parent DOM window is also not available in child iFrame (on sub-domain) because of obvious cross domain policies.
Any help would be highly appreciated.

What the exact domain name structure you are using?
If you are using mydomain.localhost, you are unable to use .localhost as a shared part of domain name, since it is 1st level doman.
If you are using mydomain.localhost.com , then shared part (document.domain) should be "localhost.com" , not just "localhost" as you mentioned in your question.
document.domain should work fine for that purpose, but even if you have two different domains, like company1.com and company2.com it is still possible to pass values from iframe to parent with help of EasyXDM .

I'm sorry, but I do not think this is possible. But maybe you could explain what you are trying to achieve and maybe we could come up with some alternatives :-)

QWebView can't display external image content set via javascript $("#<node_name>").html(<html_content>)

I'm migrating project from MFC to Qt now, and it's using embedded web browser, which displays local (resource) html-page. Local page is displayed fine, no problems. But i have a problem to set html content to child tag. QWebView can't display external images set via javascript $("#").html() - only text and local (resource) images are displayed. In MFC version with IE webview the same script works fine.
I've tried to use QWebElement::setInnerXml, but result is the same: only local content is displayed.
After that i've tried to use QWebFrame::setHtml, but after call app crashes somewhere in QWebPuginDatabase::searchPathes, despite that i'm calling QWebFrame::setHtml from main thread.
Did anyone meet the same problem? Has anyone solution to resolve my problem?
Thank you

You may need to change a setting, try:
QWebSettings::globalSettings()->setAttribute(
QWebSettings::LocalContentCanAccessRemoteUrls, true);
The QWebSettings documentation describes the attribute as (emphasis mine):
Specifies whether locally loaded documents are allowed to access remote urls. This is disabled by default. For more information about security origins and local vs. remote content see QWebSecurityOrigin.

Javascript: error in access IFrame on local files

I use some iframes in my page and I'd like to access iframe elements from parent page and the opposite.
From the parent page I add Iframes with:
<iframe id="iframe1" src="./iframe1.html" width="100%" height="100%"></iframe>
and I try di access iframe element by javascript with:
window.frames['iframe1']
...
From iframes I use something like
//to get elements
var obj = parent.document.getElementById('iframe1');
//to call methods
parent.document.mymethod();
In both situation it give me the following error:
Unsafe JavaScript attempt to access frame with URL file:///C:/Users/marco/test/iframe1.html from frame with URL file:///C:/Users/marco/test/index.html. Domains, protocols and ports must match.
I know that file have to be in the same domain. The problem is that I don't call files from web server, but browser has to read files directly from resource path. This because I will put theese files embedded in an Android app and I will read them with a webview from local resources.
I tried to set manually window.domain = 'mydomain' but nothing changed and also to use absolute path for iframes.
I use Sencha Touch, if it can be usefull.
Any ideas?
Thanks for your time,
Marco

ExternalInterface passing values from swf to an iFrame on the same page

On a page I have a an iFrame and a swf, I've been trying to use ExternalInterface to pass values from the swf to the iFrame, anyone ever tried this and had any luck? I won't be able to post any code until tomorrow, will update then if needed.
Thanks in adavnce.
Here is a visualization of what I need to accomplish, perhaps if it can't be done the way I said someone will have a suggestion of another way to accomplish this.

Try to target the frame. This should work with one frame on the page or you will have to change the index.
duhFrame = window.frames[0]
targetElement = duhFrame.getElementById('someIframeElement');
If this doesn't work for you then use LocalConnection and put a hidden swf on the iframe file.
LocalConnection is Global to the browser so be aware that if two browser windows are open you will get two iframes connecting on the same name and will get some funky results. So change the connection name via query string and flashvars.
Its a real hackish workaround but it will work.
[EDIT]
One more thing make sure your javascript callback function is getting called as ExternalInterface has major domain issues when running under the file structure and not in a domain(EX: clicking run in the editor ). Try uploading to your server and change your embed code to allow for it. Also dont forget to update your crossdomain.xml(s).

You cannot access iframes from outside of them. These are security reasons, and browsers will and should block such attempts.