ASP.NET MVC - How to pass a Javascript variable from view to controller

Question

I have a variable in a javascript function which needs to be sent to the controller. This is the code in the javascript function.

var testString = "Test";

        $.ajax({
        type: "POST",
        url: "@Url.Action("GetJavaScriptString")",
            dataType: "json",
            data: JSON.stringify(testString),
        success: function (data) {
            alert(data);
        },
        failure: function (errMsg) {
            alert(errMsg);
        }
        });

And this is the controller method

    public ActionResult GetJavaScriptString(string data)
    {

        return null;
    }

The variable "data" in the GetJavaScriptString method remains null.

Its data: { data: testString }, (not data: JSON.stringify(testString),) — user3559349
– user3559349, Commented Aug 30, 2018 at 7:04

Kiran Joshi · Accepted Answer · 2018-08-30 11:25:10Z

1

You need to send a name/value pair when the name matches the name of your parameter

var testString = "Test";
$.ajax({
    type: "POST",
    url: "@Url.Action("GetJavaScriptString")",
    dataType: "json",
    data: { data: testString }, // change this 
    success: function (data) {
        alert(data);
    },
    failure: function (errMsg) {
        alert(errMsg);
    }
});

Note that you do not need JSON.stringify(), but if you did it would be data: JSON.stringify({ data: testString }), and you would need to the contentType: 'application/json', option

edited Aug 30, 2018 at 11:25

answered Aug 30, 2018 at 7:09

Kiran Joshi

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4 Comments

user3559349 Over a year ago

No its not (and you would know that if you tested it)

user3559349 Over a year ago

Read my comment in the question

user3559349 Over a year ago

I know its now correct - you just copied my code! And your first sentence is still an incorrect statement

Kiran Joshi Over a year ago

@StephenMuecke I'm not copying your code. can you please modify as your way.

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