How can I add an attribute?

[matt-panton]

I'm trying to add the align attribute to the <table> tag. I've found the relevant documentation on the htmlpurifier website but can't get figure out how to get it to work with this laravel package.
I've put this code in my config/purifier.php file but it's still showing the error Attribute 'align' in element 'table' not supported

$config = \HTMLPurifier_Config::createDefault();
$def = $config->getHTMLDefinition(true);
$def->addAttribute('table', 'align', 'Enum#left,right,center');

[LukeTowers]

You can use my forked package instead, then you'll be able to just add it through the config file, along with having default support for HTML5: https://packagist.org/packages/luketowers/purifier
It looks like the maintainer is no longer interested in maintaining this version

[jplew]

@LukeTowers thanks for supporting the project. However, custom attributes don't seem to work for me. I'm trying to pass <img data-filename="..."> and getting this error:

ErrorException in HTMLDefinition.php line 379:
Attribute 'data-filename' in element 'img' not supported (for information on implementing this, see the support forums)

Here is the relevant part of my config/purifier.php:

'HTML.Allowed'  => 'div,b,strong,i,em,u,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src|style|data-filename]',

Am I doing something wrong?

Edit:
In addition, I'm trying to pass a 'style' attribute on my <img> tag. Despite the fact I have also specified 'style' in my HTML.Allowed, the clean() function is stripping out my style attribute. It doesn't give an error message like it does for data-filename, however.

[LukeTowers]

@jplew Are you using my package? If so, log an issue on my repository then please: https://github.com/LukeTowers/Purifier

[jplew]

@LukeTowers yes, I switched to your fork. I just submitted an issue there: LukeTowers#2

[francisashley]

+1

[LukeTowers]

@prjctnxt instead of just adding a +1, could you try playing around with the code mentioned here and see if you can figure out the issue?

[francisashley]

Hi, managed to solve it with this library /stevebauman/purify. One thing that caught me out was that Purifier will still strip your tags unless they are 100% valid. As in (after configuring): <img data-src="#"> is considered invalid but <img src="#" data-src="#"> is fine.

I played around with your library before learning about this so not sure if it is a solution?

Will take a look when I get a chance :-)

[leewillis77]

@prjctnxt Thanks for leaving this comment. I too couldn't get this library to work. Swapped over to https://github.com/stevebauman/purify and had it up and running inside 5 minutes.