I've wrote a script that previews web pages within an iframe, the problem is that some pages (eg facebook and twitter) won't open within iframes. Is it possible to detect if the page can't be loaded or if the iframe is empty?
Thanks in advance.
I do not think this is possible for sites that are not hosted on the same domain as yours, due to browsers same origin policy.
See if something like this would work for you
jsFiddle
alert($(".1").contents().find("body").length);
alert($(".2").contents().find("body").length);
You will need send request to PHP script to check website headers. For example:
$.getJSON('http://debute.eu/allowed.php?url=' + url, function(data) { });
Here is DEMO.
If you can use PHP script, I will send you my PHP.
Related
I found an nice script while searching and inspecting the elements of some websites.
This is what I have found:
<script type="text/javascript">
//redirect browser to fullscreen preview
if (/^http:\/\/codecanyon\.net/.test(document.referrer))
window.top.location.href = 'http://www.gravitysign.com/backslider/';
</script>
So if I understood from this script it tells jquery if the website is opened over codecanyon redirect them to specifed website for preview.
Now... I was wondering if there is possibility to make something like this.
If we specify an website for example http://google.com and we input that into javascript... And then if that website is uploaded to any other domain, other then google.com ... It will redirect to specified site (google) ?
So to clear things out a little bit let me make an example.
If I made a website for "an-website.com" and then someone take their website and upload it to "another-website.com", it will automatically redirect all visitors from another-website.com to an-website.com.
Hope I was clear enough and hope that this is possible. Cheers!
You can of course redirect any user accessing your site from a domain not matching yours but using javascript. This should work just fine:
if (window.location.hostname !== 'yourdomain.com'){
window.top.location.href = 'http://yourdomain.com';
}
You can also use match, if you host your site on a subdomain, etc.
Keep in mind that any person with write access to the file on the server will be able to remove this "copy protection". Copy protecting client side content is impossible, as you need to serve the content in a way a browser understands, effectively making the content available to anyone.
If you are looking for solution for single domain protection, here you can see my
Redirect Website if its not specified domain in script - Protection using Javascript
I am looking for solution for multiple domain.
I am trying to integrate with the FireShot API to given a URL, grab HTML of another web page into a div then take a screenshot of it.
Some things I will need to do after getting the HTML
grab <link> & <script> from <head>
grab <body> into <div>
But 1st, it seems when I try to do a
$.get("http://google.com", function(data) { ... });
I get a 200 in firebug colored red. I think it has to do with sites not allowing you to grab their page with JS? Then is opening a window the best I can do? But how might I control the other page with jQuery or call fsapi on that page?
UPDATE
I tried to do something like below to do something when the new window is ready, but FireBug says "Permission denied to access property 'document'"
w = window.open($url.val());
setTimeout(function() { // if I dont do this, I always get about:blank, is there a better way around this?
$(w.document).ready(function() {
console.log(w.document.body);
});
}, 1000);
I believe the cross-site security setup within Javascript is basically blocking this. You'd likely have to proxy the content through your own domain.
There are a couple other options I think for break the cross-site security constraints, but I'm not sure I'd promote them.
If the "another page" locates within the same domain of your hosting page, yes, you can. Please refer to jQuery's $().load() API.
Otherwise, you're disallowed to do so by the browser's Cross-Site Security Policy. At this moment, you can choose to use iFrame instead of DIV.
Some jQuery plugins, e.g. thickbox provides ability to load pages to appropriate container automatically.
Unless I am correct, I do not believe you can AJAX a page cross domain (e.g. from domain1.com to domain2.com). To get around this, you can have a PHP "proxy" script that does the "getting" of the page and then pass it to JS.
For example, in JS you would get() http://mydomain.com/get/?domain=http://google.com and then do what you need to do!
I have iframes with OpenX ads I server from another server/domain.
When something happens to this ad server the main server doesn't load whole contents because the domain that openx loads in iframe is not responding. I always thought that iframe works independently from the main site but it doesn't if the domain doesn't answer at all...
Anyway can main site detect somehow that a url in iframe is not responding and skips loading iframe and show the rest of the site?
How about loading the iFrame once the website is loaded? It's pretty easy to do this using jQuery (or even plain javascript using the window.load event).
So rather than wanting to 'detect' whether the iFrame has loaded, you can load it AFTER the rest of the website has completed loading. (sorry for excessive use of word 'load')
In jQuery, you can simply attach the url to the iFrame on the document.ready event.
A blank iFrame
<iframe id="iframe-ad" width="200"></iframe>
Simple jQuery to load the URL on document.ready
<script type="text/javascript">
$(document).ready(function() {
$("#iframe-ad").attr("src", "http://www.google.com");
});
</script>
Unfortunately there is no easy way to do this unless they are served from the same domain. I know there is a way to get let the javascript inside the iframe perform some actions on the parent document it is contained in, but I am not really sure how...
It is not possible, because of Same origin policy, there are some "gaps" in some browsers. But this is not going to recommend!
Might not make for the best experience, but you can make a local redirect file. something like:
<iframe src="http://www.mydomain.com/redir?url=http://www.theirdomain.com/ads"/>
then the redir page just returns
<script>
location.href = "${url}";
</script>
That way as long as your server is responding, everything else will continue as normal while the iframe redirects?
How about if I don't have iframe just javascript originating from different domain? If the domain is not responding javascript holds the page back not to load. Is there a way to prevent that?
I am trying to get the source page of a webpage on a different domain. I know this is easily done with PHP for example but I would like to do it in Javascript because I am getting results from a page and if I use a server-side language, the original website will block the calls since they come from the same IP. However, if the calls are done on the client side, it is like the user request the results each time (different user, different IP, no original site blocking me). Is there a way to do that (even if not in Javascript but client-side).
To clarify the code I want will be applied to an HTML page so I can get the results, style them, add/delete, etc then display them to the user.
Thank you.
Modern browsers support cross-domain AJAX calls but the target site has to allow them by using special headers in the reply. Apart from that, there is no pure Javascript solution AFAIK.
Could you use an iframe? You wont have direct access to the markup to due to cross-domain restrictions, but you can still display the third-party page to the user...
window.onload = function() {
var i = document.createElement("IFRAME");
i.setAttribute("name", "ID_HERE");
i.setAttribute("id", "ID_HERE");
i.setAttribute("src", "URL_HERE");
i.style.maxHeight = "300px";
i.style.width = "100%";
document.body.appendChild(i);
}
On Windows you can use HTA
An HTA can access anything crossdomain in an iframe for example
I have a rather interesting problem. I have a parent page that will create a modal jquery dialog with an iframe contained within the dialog. The iframe will be populated with content from a 3rd party domain. My issue is that I need to create some dialog level javascript that can detect if the content of the iframe loaded successfully and if it hasn't within a 5 second time frame, then to close the dialog and return the user to the parent page.
I have researched numerous solutions and only two are of any true value.
Get the remote site to include a javascript line of document.domain = 'our-domain.com'.
Use a URL Fragment hack, but again I would need the request that the remote site
able to modify the URL by appending '#some_value' to the end of the URL and my dialog window would have to poll the URL until it either sees it or times out.
Are these honestly the only options I have to work with? Is there not a simpler way to just detect this?
I have been researching if there's a way to poll for http response errors, but this still remains confined to the same restrictions.
Any help would be immensely appreciated.
Thanks
The easiest way (if you can get code added to the external sites) is to have them add an invisible iframe pointing to a special html file on your domain. This could then use parent.parent.foo() to notify the original window about the load event.
Listening for the "load" event will only tell you if the window loaded, not what was loaded or if the document is ready for interaction.
Nicholas Zakas has an article about detecting if an iframe loaded: http://www.nczonline.net/blog/2009/09/15/iframes-onload-and-documentdomain/. Basically you have this code snippet:
var iframe = document.createElement("iframe");
iframe.src = "simpleinner.htm";
if (iframe.attachEvent){
iframe.attachEvent("onload", function(){
alert("Local iframe is now loaded.");
});
} else {
iframe.onload = function(){
alert("Local iframe is now loaded.");
};
}
document.body.appendChild(iframe);
I haven't tested it, but I'm pretty sure jQuery should be able to handle it by doing something like $("#iframe").load(function () { alert("Local iframe is now loaded."); });
You could try using postMessage for communication between frames.
This will require the remote site to include some specific JavaScript to post a message to the parent document when it has finished loading.
It's possible to do this with an onload handler on the iframe itself. Unfortunately (surprise!) IE makes it difficult. The only way I could get this to work was to compose HTML for the iframe, then append it to the document with innerHTML. Then I have to poll to see when the iframe appears in the DOM, which varies depending on if the page is loading. Here's a link to the source: http://svn.openlaszlo.org/openlaszlo/trunk/lps/includes/source/iframemanager.js
See create(), __finishCreate() and gotload(). Feel free to take a copy of this and use it yourself!
Regards,
Max Carlson
OpenLaszlo.org
This is how I detected the loading of a Cross-Domain Iframe,
Set a unique id for the iframe ( U may use any sort of identifier, it doesn't matter )
<iframe id="crossDomainIframe" src=""> </iframe>
Set window event listener:
document.getElementById("crossDomainIframe").addEventListener('load',
function actionToPerform(){
//Do your onLoad actions here
}
)
In any case you will need some sort of cooperation from the other domain's server, as you are trying to abuse the Same Origin Policy (SOP)
The first solution document.domain=... won't work if domains are different. It works only for subdomains and ports, as described in the link above.
The only option that allows cross domain communication without polling is JSONP or script injection with a JS function callback. This method is available in all Google APIs and works well.
We've explained on our blog a way to sandbox those calls in an iframe to secure them. While postMessage is better now, the window.name hack has the advantage of working on old browsers.
Ironically, SOP does not prevent you to POST anything to another domain. But you won't be able to read the response.