Copy to clipboard with Pure JS

copy-to-clipboard.js

/**
 * @referenced https://stackoverflow.com/a/65996386/3299846
 * */
function copyToClipboard(e) {
	var copyText = document.getElementById(e);
	// navigator clipboard api needs a secure context (https)
	if (navigator.clipboard && window.isSecureContext) {
		// navigator clipboard api method'
		return navigator.clipboard.writeText(copyText.value);
	} else {
		// text area method
		let textArea = document.createElement("textarea");
		textArea.value = copyText.value;
		// make the textarea out of viewport
		textArea.style.position = "fixed";
		textArea.style.left = "-999999px";
		textArea.style.top = "-999999px";
		document.body.appendChild(textArea);
		textArea.focus();
		textArea.select();
		return new Promise((res, rej) => {
			// here the magic happens
			document.execCommand('copy') ? res() : rej();
			textArea.remove();
			alert('Kopyalandı');
		});
	}
}