Youtube embed: Unsafe JavaScript attempt to access

问题:

We have a Wicket app with a page that includes an embedded Youtube video. The video embeds and plays fine, but apparently it causes the rest of the page to not render- it seems that the DOM elements coming after the embed simply don't show up on the page, despite being in the markup.

Looking at the error console in Chrome reveals:

Unsafe JavaScript attempt to access frame with URL http://example.com/detail/COMMUNICATION/search/com-sonyericsson-hanashi from frame with URL http://www.youtube.com/embed/eJY7_De5opI?enablejsapi=1&autohide=1&showinfo=1. Domains, protocols and ports must match.

I've googled this a fair amount, and people seem to be saying that it's innocuous and to ignore it. That just seems wrong, and in our case it actually breaks the page.

If we change our app so that the video is embedded dynamically via an ajax callback (user clicks a Wicket AjaxLink) we still get the error in the console, but at least the page renders fully. Unfortunately this won't work for us, as we need the video to be loaded by default when the user first hits the page.

Edit: I should add that although the error message was taken from the Chrome console, the bug seems to affect every browser I've tried: Chrome, Safari and Firefox.

回答1:

The security error is unlikely to break your page. It looks like the error is happening from within the YouTube frame, which means that in the worst case the content of the frame will be messed up.

A frame/iframe from an external page cannot, under any circumstances effect the content of the parent document unless they are from the same domain and port number. It is one of the hard rules of browser security.

The error must be elsewhere in your markup. Any chance of seeing some example markup?

[edit]

The error could also be in the embed code markup. Or, if any script tags are included directly on the page (not in the iframe) it could be there.

Usually when problems like this happens it is because of an unclosed tag somewhere but it could be Javascript as well.

回答2:

If you are having an issue resolving that JavaScript error, you can try using YouTube's old embed code. It's an option on every YouTube video once you click on embed. You will not have that error because it does not use iframes. The code would look something like this:

<object width="560" height="315">
    <param name="movie" value="http://www.youtube.com/v/9DXL9vIUbWg?version=3&amp;hl=en_US&amp;rel=0"></param>
    <param name="allowFullScreen" value="true"></param>
    <param name="allowscriptaccess" value="always"></param>
    <embed src="http://www.youtube.com/v/9DXL9vIUbWg?version=3&amp;hl=en_US&amp;rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed>
</object>

Hope this helps.

回答3:

I voted for Jonathan Torres' answer, because his code stopped the Javascript warnings. However I then discovered errors when I validated the code.

So my answer is this...

Tick the "Use old embed code" checkbox when using YouTube's embed code so you're not using the iframe.

To make the code validate you need to add....

type="movie"

and

data="http://SAME YOUTUBE URL USED IN THE FIRST PARAM ELEMENT/"

to the OBJECT element. Then make the PARAM elements self-closing (but not the EMBED element).

This should make your YouTube code look like this...

<object width="560" height="315" type="movie" data="http://www.youtube.com/v/9DXL9vIUbWg?version=3&amp;hl=en_US&amp;rel=0">
<param name="movie" value="http://www.youtube.com/v/9DXL9vIUbWg?version=3&amp;hl=en_US&amp;rel=0"></param><param name="allowFullScreen" value="true" />
<param name="allowscriptaccess" value="always" />
<embed src="http://www.youtube.com/v/9DXL9vIUbWg?version=3&amp;hl=en_US&amp;rel=0" type="application/x-shockwave-flash" width="560" height="315" allowscriptaccess="always" allowfullscreen="true"></embed>
</object>

You then ought to get no Javascript warnings and your code should validate.

回答4:

The Unsafe JavaScript attempt to access frame error has nothing to do with your page not rendering. Broken markup (e.g. a missing </iframe>) is the most probable reason.

As for the Unsafe JavaScript attempt to access frame error, you have a few options:

1. Easiest solution is to use the IFrame Player API instead of manually adding iframe tags. The API is a piece of JavaScript that generates the iframe tag for you and adds the parameters that will (or should) eliminate the frame access error. Here are the instructions for using IFrame Player API to load a player.

2. The manual solution is to build the <iframe> tags and append the &origin=http://example.com parameter to the URLs. Quote:

As an extra security measure, you should also include the origin parameter to the URL, specifying the URL scheme (http:// or https://) and full domain of your host page as the parameter value. While origin is optional, including it protects against malicious third-party JavaScript being injected into your page and hijacking control of your YouTube player.

回答5:

for me it worked by using the code here: https://developers.google.com/youtube/iframe_api_reference#Loading_a_Video_Player

the lines i fixed see the words market with 2 asterix ** code:

from this:

var tag = document.createElement('script');
          tag.src = "**http://www.youtube.com/player_api**";
          var firstScriptTag = document.getElementsByTagName('script')[0];
          firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
          var players = new Array();
          function **onYouTubePlayerAPIReady()** {

        var ids = $('div.video div');

        for(var i=0; i < ids.length; i++) {
            players.push(new YT.Player('**yt**'+i, {
                height: '400',
                width: '596',
                videoId: $(ids[i]).attr('rel'),
                events: {
                    'onReady': onPlayerReady,
                    'onStateChange': onPlayerStateChange
                }
            }));
        }

      }

to this:

var tag = document.createElement('script');
  tag.src = "**https://www.youtube.com/iframe_api**";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
  var players = new Array();
  function **onYouTubeIframeAPIReady()** {

    var ids = $('div.video div');

    for(var i=0; i < ids.length; i++) {
        players.push(new YT.Player('**player**'+i, {
            height: '400',
            width: '596',
            videoId: $(ids[i]).attr('rel'),
            events: {
                'onReady': onPlayerReady,
                'onStateChange': onPlayerStateChange
            }
        }));
    }

  }