javascript - JS : How to use return type of callback function for returning the main callee function

I found few good links (How to return value from an asynchronous callback function? and Returning a value from callback function in Node.js etc) of SO but they are not not able to provide solution to my problem.

My Problem: able to get result of asynchronous call, but how I can use this result for returning of my function?

onsubmit = "return checkForm(function(callBackResponse) { alert(callBackResponse) });"

Here getting value of callBackResponse either as true or false, and want to use this value as :

onsubmit = "return responseFromCallBack;"

EDITED : Here is my async stuff

function checkForm(callback) {return firstCallBack(function secondCallBack(response) {
            if (some conditions) {
                response = false;

                callback(response);
            }
            else {
                response = true;
                callback(response);
            }
        }
    );
}

Answer

If i get ur issue correctly:
you want to "validate" (checkForm()) before submitting?!
in this case set an event listener to the form submit-event...
prevent (event.preventDefault()) the default behavior (submit) call your function (checkForm()) if everything is fine, trigger the submit manually ;)
e.g. document.getElementById('myFormId').submit()

Cheerio :)