getVideoId.js

/*
	ptrack-content div contains an attribute 'data-ui-tracking-context'
	which contains the information regarding video_id of the element.
	It's a url-encoded JSON string.
*/
function getVideoId(element) {
	let ptrack_content = $(element).find('.ptrack-content');
	if(ptrack_content && ptrack_content.length > 0) {
		let tracking_data = ptrack_content.attr('data-ui-tracking-context');
		let decoded_tracking_data = decodeURIComponent(tracking_data);

		let decoded_tracking_json = JSON.parse(decoded_tracking_data);

		// some attribute values have 'videoId' and some have 'video_id'
		return decoded_tracking_json.videoId || decoded_tracking_json.video_id;
	}
}