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not able to call asmx webservice from javascript function

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Dear friends,


Basic need



I need to call asmx webservice from javascript function. onbuttonclick, i am actually calling that javascript function. line with high size font is the problem area.



please help guys working from past 5 days on this part


WebService Registration with aspx page---------------------------------------------------
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="true">
<asp:ServiceReference Path="~/dataPreExist.asmx"/>





<ToolboxItem(False)> _
Public Class dataPreExist
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Function EnqPreExistOrNot(ByVal paraCcn As String, ByVal paraPcode As String) As Boolean
Dim strsql6 As New StringBuilder
Dim localdt6 As New DataTable
' ccn = "DJ079"
' party = "04BSPT0066"
With strsql6
.Append("select * from complaintmastercrm where ccncd='" & paraCcn & "' and partycd='" & paraPcode & "'")
End With
localdt6 = CommonDb.ReturnDataTable(strsql6.ToString, "CRM")
If localdt6.Rows.Count > 0 Then
EnqPreExistOrNot = True
MsgBox("pre Enquiry Exist")
MsgBox("Pre Enquiry not exist")
EnqPreExistOrNot = False
End If
End Function
End Class
End Namespace
Javascript Function
function webServiceCall() {
var paraCcn;
//var paraPartyCd;
var paraPcode;
//alert('hello last')
paraCcn = document.getElementById("<%=lblCcn.clientID%>").innerHTML;
paraPcode = document.getElementById("<%=hdnParty.clientID%>").value;
paraPcode = paraPcode.replace(/,s*$/, "");
var a = new namespace1.dataPreExist();
//not working block
a.EnqPreExistOrNot(paraCcn, paraPcode, OnSucessorFail);
//not working block
function OnSucessorFail() {
var proceed;
proceed = confirm("Enquiry already Generated for this Machine and Cost Center");
if (proceed == true) {
return true;
else {
return false;




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I have placed debugger in webservice but while debugging, debugger not going inside webservice.


is there any other method of debugging webservice(asmx webservice) if possible, please suggest ?


even if i place script debugger inside function OnSucessorFail() which is a javascript function it is not going inside that function.


before calling below mentioned webservice, all javascript code above this webservice call works fine, but webservice call is not working for me and also javascript after it.


a.EnqPreExistOrNot(paraCcn, paraPcode, OnSucessorFail);



is this webservice call is right ?


you can see i have placed confim box in javascript which has to come after successful execution of mentioned webservice which is not happening in my case.

Edited by rhishi20

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I don't have enough experience with .net to suggest how to debug a web service, I was just suggesting that you check your developer console for Javascript error messages. The code you highlighted as not working is inside a Javascript function, so I would start there.

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A 500 response means that the server-side code had a fatal error, that's what you need to debug.

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To JustSoemGuy:


I have solved it by another way but not by using webservice, i have used postback of one of the dropdown to finish the work at server side. and then call javascript function on Button Click.


thanks for the help.

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