Take a look at this code snippet:
When you try to run the
alert(document.styleSheets[x].cssRules.length)Additionally, is the security exception considered correct behavior and does it comply with standards?
If you encounter an error while attempting to access a stylesheet from a separate domain or server, it can result in the issue you are experiencing. This may also occur when trying to read an @import rule.
To resolve this, simply verify the length of document.styleSheets for your specific needs.
In 2013, a new method was introduced where you can designate the "crossorigin" attribute on the <link>-Element to inform the browser that the CSS is secure (https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link).
Once this attribute is set, you are able to manipulate its rules through Javascript.
It appears that you are fetching css-files from a different domain, which suggests that modifying cssRules for externally loaded css files may not be permitted.
For more information on this topic, please refer to: Accessing cross-domain style sheet with .cssRules
Although the stylesheet is present and functioning correctly, you may encounter issues accessing the cssRules property of the stylesheet since it has been nullified by the browser.
The security alert you're receiving is a result of the same origin policy. This means that if you are trying to manipulate stylesheets from a different domain than your webpage, you will face this issue. Hosting the stylesheets on the same domain as your webpage can help alleviate this problem.
Experiment with this condition: (Internet Explorer workaround)
function aftermath(index) {
var css = document.styleSheets[index].rules || document.styleSheets[index].cssRules;
alert(css.length);
}
An issue arises when using the following:
aftermath(document.styleSheets.length - 1);
Setting it to 0 resolves the problem. The CSS may not be fully loaded at the current moment, so accessing it should be deferred to a later time.
Last update:
To constantly update CSS from the source, consider utilizing a PHP proxy for loading it:
<?php
$name = 'http://ajax.googleapis.com/ajax/libs/jqueryui/$_GET[version]/themes/$_GET[theme]/jquery-ui.css';
$fp = fopen($name, 'rb');
fpassthru($fp);
exit;
?>
You can then access it using for example
/proxy.php?version=1.7.0&theme=humanityA simple solution is to enclose the problematic line of code within a try-catch block. This approach worked for me when I encountered a similar issue in one of my projects.
For improved compatibility with Firefox, consider utilizing
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