Javascript basic validation

-> Javascript form validataion (display alert one by one)
-> the following code is used when your page(like new user register form) under master page
->and you not use a master page that time  you only changes following
->document.getElementById('ctl00_ContentPlaceHolder1_txtFName').value;
->in above line remove the  "ctl00_ContentPlaceHolder1_ " word in all line
->and not required the copy following two line
    <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

-> Your .aspx page
------------------------------------------------------------------------------------------------

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

<script type="text/javascript" language="javascript">

    function validate() {

var FName = document.getElementById('ctl00_ContentPlaceHolder1_txtFName').value;

var LName = document.getElementById('ctl00_ContentPlaceHolder1_txtLName').value;

var CompanyName = document.getElementById('ctl00_ContentPlaceHolder1_txtCompName').value;

var CompanySite = document.getElementById('ctl00_ContentPlaceHolder1_txtCompSite').value;

var NoUser = document.getElementById('ctl00_ContentPlaceHolder1_txtNoUser').value;

var Email = document.getElementById('ctl00_ContentPlaceHolder1_txtEmail').value;

var Phone = document.getElementById('ctl00_ContentPlaceHolder1_txtPhone').value;

var AccountName = document.getElementById('ctl00_ContentPlaceHolder1_txtAccountName').value;

var Account_Id = document.getElementById('ctl00_ContentPlaceHolder1_txtAccountId').value;

var Password = document.getElementById('ctl00_ContentPlaceHolder1_txtAccountPass').value;

var ConfirmPass = document.getElementById('ctl00_ContentPlaceHolder1_txtConfirm').value;

        if (FName == "") {

            alert(" First Name Required");

            return false;

        }

        else if (!isNaN(FName)) {

            alert(" Digit Not Allowed");

            return false;

        }

        else if (!isNaN(LName)) {

            alert(" Digit Not Allowed");

            return false;

        }

        else if (CompanyName == "") {

            alert("Company Name Required");

            return false;

        }

        else if (NoUser == "") {

            alert("No Of User Required");

            return false;

        }

        else if (isNaN(NoUser)) {

            alert(" Character Not Allowed in No. User");

            return false;

        }

        else if (Email == "") {

            alert(" Email ID Required");

            return false;

        }

        else if (Phone == "") {

            alert("Phone Or Mobile Required");

            return false;

        }

        else if (isNaN(Phone)) {

            alert(" Character Not Allowed");

            return false;

        }

        else if (Phone.length < 10 || Phone.length > 12) {

            alert("Enter valid Phone No.");

            return false;

        }

        else if (AccountName == "") {

            alert(" Account Name Required");

            return false;

        }

        else if (Account_Id == "") {

            alert(" User Name Required");

            return false;

        }

        else if (Password == "") {

            alert(" Enter Your Password");

            return false;

        }

        else if (Password.length < 7 || Password.length > 12) {

            alert(" Password Minimum 6 Character ");

            return false;

        }

        else if (ConfirmPass == "") {

            alert(" Enter Confirm Password");

            return false;

        }

        else if (ConfirmPass != Password) {

            alert(" Confirm Password not match");

            return false;

        }

        else {

            return true;

        }

    }

    </script>

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<h2><asp:Label ID="Label1" Text="New User" runat="server" /></h2>

<asp:Label ID="lblAccNMMsg" runat="server" ForeColor="Red"></asp:Label>

     

<asp:Label ID="Label12" runat="server"  Font-Bold="True"

                    Text="Personal Information"></asp:Label>

      

<asp:Label ID="Label2" runat="server"  Text="First Name"></asp:Label>

      

<asp:TextBox ID="txtFName" runat="server"></asp:TextBox><br/>

     

<asp:Label ID="Label3" runat="server"  Text="Last Name"></asp:Label>

          

<asp:TextBox ID="txtLName" runat="server"></asp:TextBox><br/>

<asp:Label ID="Label5" runat="server" Text="Company Name"></asp:Label>

  

<asp:TextBox ID="txtCompName" runat="server"></asp:TextBox><br/>

 

<asp:Label ID="Label6" runat="server" Text="Company Website"></asp:Label>

          

<asp:TextBox ID="txtCompSite" runat="server"></asp:TextBox><br/>

 

<asp:Label ID="Label7" runat="server" Text="No. of User"></asp:Label>

          

<asp:TextBox ID="txtNoUser" runat="server"></asp:TextBox><br/>

  

<asp:Label ID="Label13" runat="server"   Font-Bold="True"

                    Text="Contact Information"></asp:Label>

<asp:Label ID="Label4" runat="server"   Text="E-Mail ID"></asp:Label>

        

<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox><br/>

   

<asp:Label ID="Label125" runat="server" Text="Phone No."></asp:Label>

          

<asp:TextBox ID="txtPhone" runat="server"></asp:TextBox><br/>

     

<asp:Label ID="Label14" runat="server"   Font-Bold="True"

                    Text="Account Information"></asp:Label>

 

<asp:Label ID="Label8" runat="server" Text="Account Name"></asp:Label>

      

<asp:TextBox ID="txtAccountName" runat="server"></asp:TextBox><br/>

<asp:Label ID="Label9" runat="server" Text="User Name"></asp:Label>

         

<asp:TextBox ID="txtAccountId" runat="server"></asp:TextBox><br/>

     

<asp:Label ID="Label10" runat="server" Text="Password"></asp:Label>

        

<asp:TextBox ID="txtAccountPass" runat="server" TextMode="Password"><br/>

               </asp:TextBox>

 

<asp:Label ID="Label11" runat="server" Text="Confirm Password"></asp:Label>

         

                <asp:TextBox ID="txtConfirm" runat="server" TextMode="Password"></asp:TextBox><br/><br/>

   

                <asp:Button ID="btnSignUp" runat="server" Text="Sign Up" OnClientClick="return validate();"

                    onclick="btnSignUp_Click"  />

                <asp:Button ID="btnCancel" runat="server" Text="Cancel" />

</asp:Content>