Question

I want to stop the submit button in the js function checkUni()

Usually in js you can just return false, but that it not gonna work in my case because its an asynchronous (ajax)function, so the outer function will return before the inner function is able to determine wether to return false or true.

Here is the js function:

function checkUni() {
 var URL = "http://localhost:8080/GradSchoolApp/test.jsp";
  var container = document.getElementById("container_ID"); //destination of returned data
  var request = false;

  if (window.XMLHttpRequest) {
    request = new XMLHttpRequest();
  }
  else if (window.ActiveXObject) {
    try {
        request = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
        try {
            request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {
        }
    }
  }
  request.open("GET", URL, true);

  request.onreadystatechange = function() { 
    if (request.readyState == 4) {
        //SOME CODE
                    //IF <something> then STOP SUBMIT BUTTON
        container.innerHTML = request.responseText;
    }
  }
  request.send(null);
}

Answer 1

Simply return false in the onclick listener.

<input type="submit" onclick="checkUni(); return false;"/>