jQuery ajax - blank response returned

I am trying to use jQuery ajax to get some values from the database and then return them in an array.

I have used the same code several times before but this time, no response is being returned. Although the post values are the correct values that I would expect. Here is the javascript code that I am using:

$.ajax({ url: '/BlogArchive.asmx/ChangePost'
                    , type: 'POST'
                    , contentType: 'application/json; charset=utf-8'
                    , data: '{FileName:"' + FileName + '"}'
                    , dataType: 'json'
                    , success: funct开发者_如何学Pythonion (data) 
                    {
                        var arrayList = data.d;

                        var BlogPostTitle = $(".BlogPostTitle")[0];
                        var BlogPostDate = $(".BlogPostDate")[0];
                        var BlogPostContent = $(".BlogPostContent")[0];

                        $(BlogPostTitle).html(arrayList[0]);
                        $(BlogPostDate).html(arrayList[1]);
                        $(BlogPostContent).html(arrayList[2]);

                    }
//                    , error: function (XMLHttpRequest, textStatus, errorThrown)
//                    {
//                        //There was an error
//                        alert('dfd');
//                    }
            });

The only javascript error that I am receiving is that data is null, which I would expect as the response is blank.

It seems that the name of the web method that I am calling from my javascript is not even being read, because if I changed 'ChangePost' to 'ChangePost1' for example, it still returns a blank response, although I would expect an error message saying that the web method can't be found.

It seems that it does recognise that the BlogArchive.asmx web service exists because if I put something that would create an error in the VB code, the error appears as the response.

I am sure this must be something simple that I am doing wrong. Any help would be appreciated.

---

, data: '{FileName:"' + FileName + '"}'

Seems odd. You probably meant:

, data: {FileName: FileName}

(or 'FileName=' + FileName)

Furthermore, did you inspect the request (and response) via FireBug or similar?

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You should try using jQuery getJSON with the minimal arguments.

Another thing, when you are using JSON with jQuery, if the answer data are not wellformed (like a space before / after the starting JSON string) could lead to a blank answer from jQuery.

Be sure using traditionnal AJAX with jQuery that your answered data are correct.