ASP.NET CORE Ajax post additional paramaters with view model

Question

In my project (ASP.NET Core 2.2. MVC) I'm trying to do an ajax post with additional parameters to the view model. The form on the page has an id='frmMain'.

My js looks like this:

//post
var data = {
    model: $("#frmMain").serialize(),
    passtest: 'test'
};

$.ajax({
    type: 'post',
    url: url,
    data: JSON.stringify(data),
    dataType: 'json',
    success: function () {
    //alert('form was submitted');
}
}).done(function (result) {

    if (result.status === "success") {

        //some code here
    }
    } else {
        //some code here
    }
});

My controller actions looks like this:

public IActionResult DoSomething(MyModel model, string passtest)
{
    //some action code here
}

Now, the post works, but in my controller action only "model" is filled with data. Variable "passtest" is null. Also there is no "passtest" in the "model".

What am I doing wrong?

Note: I found a workaround with filling hidden fields (and adding them to the view model), but plainly passing multiple parameters in the post itself seems more practical...

Anton Toshik · Accepted Answer · 2019-10-17 08:13:58Z

1

you can append it to the url using the query notation.

url = url + '?passtest=' + myVal

Let's say if your myVal includes special characters like , / ? : @ & = + $ #

You then want to encode it so they are not parsed as part of the url notation:

url = url + '?passtest=' + encodeURIComponent(myVal)

edited Oct 17, 2019 at 8:13

answered Oct 16, 2019 at 21:22

Anton Toshik

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2 Comments

TheMixy Over a year ago

thank you, this works. Can myVal contain special characters like: ' " / \ ? +

Anton Toshik Over a year ago

@TheMixy kinda, you'll need to encode the part of the url containing special characters using the encodeURIComponent(part) function. I've updated the answer.

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