JSFiddle - React, Tailwind, and code Playground

HTML

<div id='LookupSection'>
			Input Type
			<input type="radio" name="StatusOnHeader" value="Edit">Edit existing
			<input type="radio" name="StatusOnHeader" value="Add" checked>Add new
		</div>
	

		<input type="submit" class='buttons' name="send_button" value="Save" onclick='commitData()'>&nbsp &nbsp

JavaScript

function commitData()
		{			
			switch (true) {
				case document.getElementsByName('StatusOnHeader')[0]:
					alert('Edit');
					break;
				case document.getElementsByName('StatusOnHeader')[1]:
					alert('Add');
					break;
				default:
					alert('XXX');
					break;
			} 
			if (document.getElementsByName('StatusOnHeader')[0]) {
				alert("TRUE");
			} else {
				alert("FALSE");
			}
			if (document.getElementsByName('StatusOnHeader')[0] == true) {
				alert("TRUE");
			} else {
				alert("FALSE");
			}
			if (document.getElementsByName('StatusOnHeader')[0] == 1) {
				alert("TRUE");
			} else {
				alert("FALSE");
			}
			if (document.getElementsByName('StatusOnHeader')[0] == '1') {
				alert("TRUE");
			} else {
				alert("FALSE");
			}
			switch (document.getElementsByName('StatusOnHeader')[0]) {
				case true:
					alert('Edit');
					break;
				case false:
					alert('Add');
					break;
				default:
					alert('XXX');
					break;
			} 
		}