Ever run a YouTube video inside a modal and have it keep playing after the user closes the modal. This is how to stop this annoying behavior.

First make sure you add the URL parameter ?enablejsapi=1 to the src attribute of the iframe.

Then use this function on any action to pause the video:

pauseYouTube () {
    $('iframe[src*="youtube.com"]').each(function() {
        var iframe = $(this)[0].contentWindow;
        iframe.postMessage('{"event":"command","func":"pauseVideo","args":""}', '*');