If javascript validation return false then stop server side code to exeucte and focus on that fields

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
        function Validate()
        {
            var summary="";
            summary+=isvalidUserName()
            if (summary!="")
            {
                alert(summary);

                return false;

            }
            else
            {
                return true;
            }
        }
        function isvalidUserName()
        {
            var UserName=document.getElementById('txtUserName');
            if(UserName.value!="")
            {
                var UserNameExpession=/^[0-9a-zA-Z]+$/;
                if(UserName.value.match(UserNameExpession))
                {
                   return true;
                }
                else
                {
                    alert('UserName Should Be Combination of Alphabet and Numbser');
                    UserName.focus();
                    return false;
                }
            }
            else
            {
                alert('User Name Can not be null');
                UserName.focus();
                return false;
            }
        }

    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
    <table>
        <tr>
            <td colspan="3">
                <center>User Registration Form</center>
            </td>
        </tr>
        <tr>
            <td>User Name</td>
            <td></td>
            <td><asp:TextBox ID="txtUserName" runat="server" ></asp:TextBox></td>
        </tr>
         <tr>
            <td>Password</td>
            <td></td>
            <td><asp:TextBox ID="txtPassword" runat="server" ></asp:TextBox></td>
        </tr>
        <tr>
            <td>Conform Password</td>
            <td></td>
            <td><asp:TextBox ID="txtConfirmPassword" runat="server" ></asp:TextBox></td>
        </tr>
       <tr>
            <td>First Name</td>
            <td></td>
            <td><asp:TextBox ID="txtFirstName" runat="server" ></asp:TextBox></td>
        </tr>
        <tr>
            <td>Last Name</td>
            <td></td>
            <td><asp:TextBox ID="txtLastName" runat="server" ></asp:TextBox></td>
        </tr>
        <tr>
            <td>Address</td>
            <td></td>
            <td><asp:TextBox ID="txtAddress" runat="server" ></asp:TextBox></td>
        </tr>
   <%--      <tr>
            <td>City</td>
            <td></td>
            <td><asp:DropDownList ID="ddlCity" runat="server" Width="152px" ></asp:DropDownList></td>
        </tr>
         <tr>
            <td>State</td>
            <td></td>
            <td><asp:DropDownList ID="ddlState" runat="server" Width="152px" ></asp:DropDownList></td>
        </tr>--%>
        <tr>
            <td>Email</td>
            <td></td>
            <td><asp:TextBox ID="txtEmail" runat="server" ></asp:TextBox></td>
        </tr>
        <tr>
            <td>Mobile Number</td>
            <td></td>
            <td><asp:TextBox ID="txtMobileNumber" runat="server" ></asp:TextBox></td>
        </tr>
        <tr>
            <td colspan="3">
            <center>
                <asp:Button ID="btnSubmit"  runat="server" Text="Submit" OnClientClick="return Validate()" OnClick="btnSubmit_Click" />
            </center>
            </td>

        </tr>
         <tr>
            <td colspan="3">
            <center>
                <asp:Label ID="lblError" runat="server" ></asp:Label>
            </center>
            </td>

        </tr>
    </table>
    </div>
    </form>
</body>
</html>

Posted 19-Feb-14 22:36pm

Patel Shailendra

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prakashdotnet · Answer 1 · 2014-02-19T22:43:00

Add custom validator and add your javascript function name in clientvalidationfunction

C#

<asp:customvalidator clientvalidationfunction="validatecontrols" forecolor="Red" errormessage="your error message" controltovalidate="txtUserName" runat="server" xmlns:asp="#unknown"></asp:customvalidator>

Patel Shailendra · Answer 2 · 2014-02-19T22:45:00

Solution 2

Hi Prakash i don't want any additional server control to be add.

Posted 19-Feb-14 22:45pm

Patel Shailendra

Comments

prakashdotnet 20-Feb-14 5:12am

Yes as you want your code is working correctly.

Patel Shailendra 20-Feb-14 5:18am

I know that but i want to stop server side btnSubmit_Click event.