asp.net - How to send Json object (or string data) from Javascript xmlhttprequest to MVC Controller

Question

I created a web application in ASP.NET MVC and trying to call a controller through Javascript AJAX. In Jquery we can send a json object which MVC Model Binder automatically tries to create a .NET object and pass in the controller as an argument.

However I am using a web workers in which jquery cannot be used. So I am making the AJAX call through the vanilla xmlhttprequest object. Is there a a way to send the Json object through this method?

I used the xmlhttprequest's send method but the model object comes as null in the controller :(

Answer 1

You should just be able to use JSON2 to stringify it and set the Content-Type header to application/json when you do the post.

http://ajax.cdnjs.com/ajax/libs/json2/20110223/json2.js

You would do something like:

var xhr = new XMLHttpRequest();
xhr.open('POST', '/Controller/Action');
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onreadystatechange = function () {
    if (xhr.readyState == 4 && xhr.status == 200) {
        alert(xhr.responseText);
    }
}
xhr.send(JSON.stringify(myData));