Thread: Reading Values from XML and using results with Promise

I am reading a local XML file and outputing the results as variables and i want to check that these are "available" else produce the error. Currently this code is saying that z equals empty, but it is not. Basically I want this to check each one in turn (check z, c, f in this order), and if any of them are empty produce the error message.

Code:

<script>
		var promise = new Promise(function(resolve, reject){
			var xmlhttp = new XMLHttpRequest();
			  xmlhttp.onreadystatechange = function() {
			    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			      myFunction(xmlhttp);
			    }
			  };
			  xmlhttp.open("GET", "cd_catalog.xml", true);
			  xmlhttp.send();
			
			function myFunction(xml) {
			  var xmlDoc = xml.responseXML;
			  x = xmlDoc.getElementsByTagName("IP")[0];
			  y = x.childNodes[0];
			  z = y.nodeValue;
			  console.log(z);
			  a = xmlDoc.getElementsByTagName("CountryName")[0];
			  b = a.childNodes[0];
			  c = b.nodeValue;
			  console.log(c);
			  d = xmlDoc.getElementsByTagName("City")[0];
			  e = d.childNodes[0];
			  f = e.nodeValue;
			  console.log(f);
			}
			  if(myFunction(z == "")){
				resolve("Stuff worked");
			}	
			else{
				reject(new Error("It broke"));
			}
		});	
		promise
				.then(result => {
					console.log(y + " " + "This is awesome" + " " + y * 5);
				})
			  .catch(error => {
			  	fallbackimg = new Image();
			  	fallbackimg.src = "http://3.bp.blogspot.com/-fxkwVPW57DY/UBfvtElw15I/AAAAAAAAAMc/xwlCZJEZ2Lg/s1600/love-color-rain-Love-hearts-ngi-5-500x500-Bookmarks-406647-normal_large.png";
			  	fallbackimg.alt ="";
			  	document.getElementById("demo").appendChild(fallbackimg);
			  });
			  </script>

I am relatively new to promises so direction is really appreciated.

Thanks
Rustic

Sorry please delete. Ive realised ive posted this in the wrong forum XD