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Trying to load CSS file conditionally – only for specific pages with the following:

add_filter('tablepress_use_default_css', 'tablepress_css_conditional_load');
function tablepress_css_conditional_load($load) {
return ((!is_page(array( 229, 9 ))) ? false : $load);
}

For some reason it is not working. To make sure that there is no mistake in the IDs I replaced ! is_page( array( 229, 9 ) ) with ! is_page() and with ! is_single() but still it is not working. Deactivated other plugins, changed theme, still nothing. The CSS name is verified with the plugin author. When the above part is replaced with is_single() the code works in a way that lets the CSS load for any page – not for posts. However the point is to load only for the named pages. Which is the correction needed?

  • is_single() is working correctly developer.wordpress.org/reference/functions/is_single – Stefano Tombolini Jan 12 at 18:12
  • @StefanoTombolini Yes, but the point is to have the css file loading only for the specific pages 229 and 9. – Michael Jan 12 at 18:39
  • Do !is_single / !is_page work as expected? It should load only on posts / pages. – Stefano Tombolini Jan 12 at 19:41
  • @StefanoTombolini No, they do not work at all: if I use either !is_single or !is_page the css file is loading both for pages and posts. – Michael Jan 13 at 13:48

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