Zendesk Help Center JS to inject Copy URL button into article page

copy_article_url.js

// Copy URL sharing button. CSS dependency: .share-url
(function() {
	'use strict';

	if (window.location.href.indexOf('/articles/') > -1) { // only run on article page
		if ( !$('.btn-copy').length ) { // add button if doesn't exist
			$('.article-share .share').prepend('<li><a class="btn-copy share-url">Copy URL</a></li>');
			$('.btn-copy').on('click', copyStringToClipboard);
		}
		function copyStringToClipboard(event) { // copy article URL
			event.preventDefault();
			var el = document.createElement('textarea');
			el.value = window.location.href;
			el.setAttribute('readonly', '');
			el.style = { position: 'absolute', left: '-9999px' };
			document.body.appendChild(el);
			el.select();
			try {
				var successful = document.execCommand('copy');
				console.log('Article URL was ' + (successful ? 'copied' : 'not copied'));
				var $btn = $('.btn-copy');
				if (successful) {
					$btn.text('Copied!');
					setTimeout(function() {
						$btn.text('Copy URL');
					}, 4000);
				}
			} catch(err) {  
				console.log('Oops, unable to copy Article URL', err);
			}
			document.body.removeChild(el);
		}
	}
})();