Jquery $.ajax not posting a string of data in ASP.NET MVC

Question

I have a situation where I am building the json data to post dynamically. so I create it in a for loop and then attempt to use the $.ajax command, but on the server side the model is null. If I hard code the data section as would be normal, it works fine. I tried the same process with a simple model just to check and the same happens.

So this works:

$.ajax({
            url: '@Url.Action("SetupQuestions", "Login")',
            type: 'POST',
            dataType: 'json',
            cache: false,
            data: {SharedSecret: 'Bob'},     
            success: function (data, status, xhr) {
                $('#divMFAQuestion').html(data).fadeIn('slow');
            },
            error: function (xhr, status, error) {
                alert("MFA Challenge Error (b): " +  error);
            }
        });

But this doesn't:

        var datastring = '{SharedSecret: Bob}';
        $.ajax({
            url: '@Url.Action("SetupQuestions", "Login")',
            type: 'POST',
            dataType: 'json',
            cache: false,
            processData: false,
            data: JSON.stringify(datastring),                
            success: function (data, status, xhr) {
                $('#divMFAQuestion').html(data).fadeIn('slow');
            },
            error: function (xhr, status, error) {
                alert("MFA Challenge Error (b): " +  error);
            }
        });

Nor this:

 var datastring = 'SharedSecret: Bob';

Any thoughts?

You have quotes around your json in datastring.

ElGavilan
– ElGavilan

2015-10-28 16:44:29 +00:00
Commented Oct 28, 2015 at 16:44 — ElGavilan
– ElGavilan, Commented Oct 28, 2015 at 16:44

ElGavilan · Accepted Answer · 2015-10-28 17:56:21Z

4

You have quotes around your entire JSON data structure:

var datastring = '{SharedSecret: Bob}';

JSON.stringify expects a JSON structure, so the quotes should only be around the string part for JSON.stringify to work:

var datastring = {SharedSecret: 'Bob'};

However, the reason that your AJAX call is not working is that the data parameter accepts a JSON data structure. JSON.stringify will serialize it as a string, which data does not expect. So you need to just pass the fixed datastring without JSON.stringify.

data: datastring

edited Oct 28, 2015 at 17:56

answered Oct 28, 2015 at 16:45

ElGavilan

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2 Comments

Praxis Ashelin Over a year ago

More correctly, shouldn't it be {SharedSecret: 'Bob'}?

Cef Over a year ago

Works after removing the processData = false and JSON.stringify(). ThankS!

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