javascript - "Message":"Invalid web service call, missing value for parameter: u0027hahau0027 - Stack

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I'm a newbie in Jquery Ajax. I need your help. I want to display one text beside span element. I have already done reference some topics but i cant resolve it

Here is my error in firebug (newlines and indentation added)

{"Message":"Invalid web service call, missing value for parameter: \u0027haha\u0027.",
 "StackTrace":"
   at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)
   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)
   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)
   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",
 "ExceptionType":"System.InvalidOperationException"}

In aspx

<asp:TextBox ID="txtNoiDung" runat="server" TextMode="MultiLine" CssClass="txtNoiDung"></asp:TextBox><span id="vltxtNoiDung"></span>

In code behind

  [WebMethod()]
    public static string test1cai(string haha)
    {
        return haha;
    }

In Javascript

$(".txtNoiDung").focusout(function () {
        var dataToSend = { names: $(this).val() };
        $.ajax({
            type: "POST",
            url: "QuanLyTin.aspx/test1cai",
            data: JSON.stringify(dataToSend),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                $("#vltxtNoiDung").text(msg.d)
            },
            error: function (xhr, reason, ex) {
                alert(reason);
            }
        });
});

Thanks in advance!

I'm a newbie in Jquery Ajax. I need your help. I want to display one text beside span element. I have already done reference some topics but i cant resolve it

Here is my error in firebug (newlines and indentation added)

{"Message":"Invalid web service call, missing value for parameter: \u0027haha\u0027.",
 "StackTrace":"
   at System.Web.Script.Services.WebServiceMethodData.CallMethod(Object target, IDictionary`2 parameters)
   at System.Web.Script.Services.WebServiceMethodData.CallMethodFromRawParams(Object target, IDictionary`2 parameters)
   at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context, WebServiceMethodData methodData, IDictionary`2 rawParams)
   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",
 "ExceptionType":"System.InvalidOperationException"}

In aspx

<asp:TextBox ID="txtNoiDung" runat="server" TextMode="MultiLine" CssClass="txtNoiDung"></asp:TextBox><span id="vltxtNoiDung"></span>

In code behind

  [WebMethod()]
    public static string test1cai(string haha)
    {
        return haha;
    }

In Javascript

$(".txtNoiDung").focusout(function () {
        var dataToSend = { names: $(this).val() };
        $.ajax({
            type: "POST",
            url: "QuanLyTin.aspx/test1cai",
            data: JSON.stringify(dataToSend),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                $("#vltxtNoiDung").text(msg.d)
            },
            error: function (xhr, reason, ex) {
                alert(reason);
            }
        });
});

Thanks in advance!

• javascript
• jquery
• asp
• ajax

Share Improve this question Follow edited Nov 6, 2011 at 16:59 tuan.it89 asked Nov 6, 2011 at 16:37 tuan.it89tuan.it89 31311 gold badge33 silver badges1010 bronze badges

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2 Answers 2

Sorted by: Reset to default 7

Change data: JSON.stringify(dataToSend), to

data: JSON.stringify({
    haha: $(".txtNoiDung").val()
}),

This is assuming that $(".txtNoiDung") is unique in the page, if it's not, you'll need another mechanism for getting the value. I'm pretty sure you can get away with $(this).val()) to get the value in this case.

The parameter name from the method should always be same with parameter passed in the data for an Ajax call. instead of names in data use haha(parameter from c# method).

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