Include app css in plugin

[adcantu]

Hello I am trying to create a plugin to add a country flag in the hovercard. I am using <span class="ipsFlag ipsFlag-{$country}"></span> but the flag doesn't show up. It seems that the flags.css isn't even loading. How can I have my plugin ensure that css is loaded? Also if I want to pull css from an installed app how could I make my plugin do that as well?

[bfarber]

\IPS\Output::i()->cssFiles = array_merge( \IPS\Output::i()->cssFiles, \IPS\Theme::i()->css( 'flags.css', 'core', 'global' ) );

 

[adcantu]

Thanks! 
I'm still having issues with the css not loading. Not sure where I need to put this. I tried to hook it into includeCSS, that didn't work. I put it under the <ips:template parameters="" /> in my plugin.phtml, not working either. Any direction?

{{\IPS\Output::i()->cssFiles = array_merge( \IPS\Output::i()->cssFiles, \IPS\Theme::i()->css( 'flags.css', 'core', 'global' ) );}}


<span class="ipsDataItem_main">
  <span class='ipsFlag ipsFlag-{expression="mb_strtolower($country)"}'></span>	
</span>

 

[bfarber]

You want to put that in a backend PHP file - at the time template files are compiling it may (or may not, depending on order) be too late to define additional CSS files to load in that manner.