How can I use is_page() inside a plugin?

Question

I want my plugin to register a script only in a certain page.

For example, inside my plugin file I want to write something like this:

if (is_page())          


        

Answer 1

is_page() only work within template files.

And to use it within plugin files, you need to use it with the combination of template_redirect action hook.

This action hook executes just before WordPress determines which template page to load.

So following snippet would work:

add_action( 'template_redirect', 'plugin_is_page' );

function plugin_is_page() {
    if ( is_page( 'articles' ) ) {
        wp_register_script( 'my-js-handler', '/someurl/main.js', [], '1.0.0', true );
    }
}