Question

I currently have a web page that uses javascript, however; when I use my Ajax to move towards the DB my responseText is always empty.

js to make the flag and send query

 objAjaxUpdates.main_flag = "getNames";
    objAjaxUpdates.SendQuery(query);

next in the flow
(The url is an aspx file)

this.SendQuery = function(data) {
        this.Initialize();
        if (this.req != null) {
            //alert(data);
            //alert(this.url + " " + this.main_flag);
            this.req.open("POST", this.url);
            this.req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
            this.req.onreadystatechange = this.processData;
            this.req.send(data);
        }
    }

Next

this.processData = function() {
        if (objAjaxUpdates.req.readyState == 4) {
            if (objAjaxUpdates.req.status == 200) {
                if (objAjaxUpdates.req.responseText == "") {


                    alert('No Return');
                }
                else { 
                   ...

Any help would be appreciated.

Answer 1

I don’t know the library you are using. But the procedure looks correct to me. (There are libraries like jQuery which avoids you to work on the low-level AJAX API, checking response code and so on.)

I advise you to work with something like Firebug for Mozilla, or the Chrome Developer Tools to “debug” your AJAX machinery.

There still is that good old technique:

• First test the requests to the server manually.
• Then, do a dumb AJAX request.
• At the end, test both components.