Making an ASP.NET MVC Ajax call with the use of Javascript

Question

First off, thanks for taking the time to read.

I'm trying to delve into ASP.NET MVC at the moment, however i currently have no wish to use any type of JavaScript framework, so please, don't tell me how much easier it would be etc, in your answer.

I currently have a Javascript function that successfully makes an AJAX call, however i am struggling to understand why no values are being returned from the request.

The function is as follows.

function ajaxRequestUser(num) {
var ajax;

try {
    ajax = new XMLHttpRequest();
} catch(e) {
    try {
        ajax = new ActiveXObject(Msxml2.XMLHTTP);
    } catch(e){
        alert('old browser');
    }
}

ajax.readystatechange = function () {
    if (ajax.readyState == 4) {
        var queryResult = ajax.responseText;

        if (!queryResult) {
            alert('No Information.');
        } else {
            alert(queryResult);
        }
    }
}
   var requestString = "?user="+num;
   ajax.open("GET", "/Users/GetUser" + requestString, true);
   ajax.send(null);
}

The function is called via a separate function that simply does some UI modifications to allow for the display of the data.

The alerts are there at this point, because i was not receiving any data back from the call and i was testing to see if that part of the code was being hit at all (Don't go into the differences between Synchronous and Asynchronous.). No matter how long i waited the data being returned was not being returned, after breaking through the actual server side c#, i saw the data being sent back, but it was just never being received. Is there something in the code that was done wrong? Or am i going about receiving the inbound data in the wrong way?

Answer 1

我发现了与我的代码有关的问题，并且这仅仅是基于我的ajax.event声明的错误，其中该事件是onreadystatechange而不是readystatechange