jquery not to do postback when user id existing

Question

4.00/5 (1 vote)

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.NET3.5

I am using JQuery to validate whether user is existing in the database.

The function is as follows:

JavaScript

function CheckUserID() {
           var Email;
           Email = $('#<%=txtEmail.ClientID%>').val();
           Page_ClientValidate();
           if (Page_IsValid) {
               ValidatorEnable(document.getElementById('<%=reqName.ClientID %>'), false);
               ValidatorEnable(document.getElementById('<%=reqEmail.ClientID %>'), false);
               $.ajax({
                   type: "GET",
                   async: false,
                   url: "CkeckUser.aspx",
                   data: "UID=" + Email,
                   cache: false,
                   success: function(resultMsg) {
                       $('#<%=hdnEmailID.ClientID%>').val($(resultMsg).find("#divEmail input[type='hidden']").eq(0).val());
                       if ($('#<%=hdnEmailID.ClientID%>').val() == '1') {
                           $('#<%=lblMsg.ClientID%>').text('Users exists');
                           return false;
                       }
                       else {
                           $('#<%=lblMsg.ClientID%>').text('Users doesnot exists');
                           return true;
                       }
                   },
                   error: function(msg) {
                       alert("Error");
                   }
               });
           }
           else {
               ValidatorEnable(document.getElementById('<%=reqName.ClientID %>'), true);
               ValidatorEnable(document.getElementById('<%=reqEmail.ClientID %>'), true);
               $('#<%=lblMsg.ClientID%>').text('');
           }
       }

It checks for the user existence (if user is existing it will show msg ..user exists.. and does postback to insert the value in database).

Any one can help (to avoid doing postback) when user is existing in database.

Thank you,
yashoda

Posted 29-Jun-11 20:32pm

bandayashoda

Updated 30-Jun-11 8:14am

Kythen

v2

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Kiran Sonawane 30-Jun-11 2:44am

Can you show your code where you calling CheckUserID javascript function

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Ruard · Answer 1 · 2011-06-30T07:01:00

CheckUserID() is not always returning a value. Add this line to the end of your function:

return false;

And how are you calling the function? You will need something like this:

<form name="frm1" onsubmit="return CheckUserID();"></form>

This will not work:

<form name="frm1" onsubmit="CheckUserID();"></form>