jQuery Ajax call to webservice, returns undefined

Question

I have a small problem, with my webservice call. I've debugged it, and the webservice gets called, with the correct value and it also returns the correct value. However, my alert (in the completed function)says: 'undefined'. What am I doing wrong? Here's my function:

function GetServiceValue() {
var Parameter = "{contextKey: '" + $('#<%= ProjectNumText.ClientID %>').val() + "'}";
alert('Para: ' + Parameter);
$.ajax({
    type: 'Post',
    url: 'DynamicPopulateService.asmx/GetProjectName',
    data: Parameter,
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(msg) {
        AjaxSucceeded(msg);
        },
    error: AjaxFailed
});}

And here is the completed function:

function AjaxSucceeded(data)
{
alert(data.responseText);
}

njr101 · Accepted Answer · 2011-10-06 14:32:36Z

3

It looks like you're using ASP.NET. ASP.NET script services return the JSON response under a wrapper object called simply "d". Try this:

function AjaxSucceeded(data)
{
    alert(data.d.responseText);
}

answered Oct 6, 2011 at 14:32

njr101

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2 Comments

Nicolai Over a year ago

Excellent, it worked! Except, I removed responseText. So alert(data.d)

njr101 Over a year ago

All properties of the object returned by the web serice will be available under the data.d wrapper object. If the object returned from your web service doesn't have a responseText property, then neither will data.d. It's very easy to see what's happening if you use the JSON tab in firebug.

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