[Plugin: FitVids for WordPress] Object doesn't support property or method 'fitVids'

i noticed this javascript error when i tried to set a custom CSS selector on the fitvids options page.

The following prints in the footer:

jQuery(document).ready(function() {
    		jQuery('.external-videos').fitVids();
    	});

which would be right except that it prints before the fitvids.js is loaded.

// add fitvids
    	wp_register_script( 'fitvids', plugins_url('/jquery.fitvids.js', __FILE__), array('jquery'), '1.0', true);
    	wp_enqueue_script( 'fitvids');
    	add_action('wp_footer', array($this, 'add_fitthem'));

JS files that are enqueued in the footer (that last parameter = true) are actually added to wp_footer via the wp_print_footer_scripts hook which has a priority of 20.

since you aren’t declaring a priority on

add_action('wp_footer', array($this, 'add_fitthem'));

it is 10 by default which comes before the script is loaded, hence my error.

this can be corrected in 1 of 2 ways. by changing to either

add_action('wp_print_footer_scripts', array($this, 'add_fitthem'));

or

add_action('wp_footer', array($this, 'add_fitthem'), 30);

https://www.ads-software.com/extend/plugins/fitvids-for-wordpress/