Answers for "register enter onclick event in javascript"

javascript submit form when enter key pressed

//submit form when 'Enter' key is pressed while in myInputID
document.getElementById("myInputID").addEventListener("keyup", function(event) {
    if (event.keyCode === 13) {
    	document.getElementById("myFormID").submit();
		return false;
    }
});

javascript detect enter press on input

var el = document.getElementById("myInputID");
el.addEventListener("keydown", function(event) {
    if (event.key === "Enter") {
        // Enter key was hit
    }
});