ASP.Net C＃MCV-将值从Ajax jQuery传递到控制器

Question

I need to pass a value from the front end to the controller, I'm struggling to get it to pass the value.

Ajax/Jquery

//unlock user account
    $("#results").on('click', ".unlockactionbutton", function (e) {
        e.preventDefault();
        var userid = this.getAttribute("userid");
        if (envdd.children(':selected').val() == "") {
            alert("Please select User"); 
        } else {
            alert(userid);
            $.ajax({
                type: "GET",
                url: "@Url.Action("UnlockUser", "Home", new { userid = userid })",
                //Url.Action("UnlockUser", "Home", new { id = userid });
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                data: JSON.stringify(userid),
                success: function (data) {
                    console.log(data);
                },
                error: function(data) {
                    alert('error');
                    console.log(data);
                }
            });
        }
    });

Here is the ActionResult. I've got the code simply putting a comment in the console so I can see that it's worked for now.

[HttpPost]
    public ActionResult UnlockUser(string userid)
    {
        if (userid != "")
        {
            return Json("success - call from HomeController", JsonRequestBehavior.AllowGet);
        }
        else
        {
            return Json("error", JsonRequestBehavior.AllowGet);
        }
    }

Answer 1

在ajax请求上，您正在使用动词GET，而您的操作是POST方法。

Answer 2

The controller action is decorated with HttpPost but you're sending a GET request in the ajax , change the type to type: 'POST', .

You don't need to append data to your query string when issuing a POST request.

Also, if you're specifying application/json make sure you send json , at the moment you're sending a string. So, you could either remove the line contentType: "application/json; charset=utf-8", or change the data parameter to data: JSON.stringify({ userid: userid }) .

Your ajax request could look like:

    $.ajax({
            type: "POST",
            url: "@Url.Action("UnlockUser", "Home")",  
            dataType: "json",
            data: JSON.stringify(userid),
            success: function (data) {
                console.log(data);
            },
            error: function(data) {
                alert('error');
                console.log(data);
            }
        });

Or

    $.ajax({
            type: "POST",
            url: "@Url.Action("UnlockUser", "Home")",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            data: JSON.stringify({ "userid" : userid }),
            success: function (data) {
                console.log(data);
            },
            error: function(data) {
                alert('error');
                console.log(data);
            }
        });

Answer 3

Try something like this, this will work:

$("#results").click(function (){
    var userid = this.getAttribute("userid");
    $.ajax({
        type: "POST",
        url: "/Home/UnlockUser",
        "data": "{userid:'" + userid + "'}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
             console.log(data);
        }
    });
})