Send form using ctrl+enter / cmd+enter

sendform.js

window.onload = function () {
	document.getElementById("commentform").onkeydown = function (e) {
		if (e.keyCode == 13 && e.ctrlKey) { // keyCode 13 is Enter
			document.getElementById("submit").click(); // submit the form by hitting ctrl + enter
			// alert(e.keyCode); // to know other keyCodes of each keys
			return false; // preventing default action
		}
		if (e.keyCode == 13 && e.metaKey) { // keyCode 13 is Enter
			document.getElementById("submit").click(); // submit the form by hitting cmd + enter
			// alert('test'); // to know other keyCodes of each keys
			return false; // preventing default action
		}
	}
}