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How to validate username?this my register.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.util.*" %>
<%@ page import="java.sql.*" %>
<%@ page import="java.text.*" %>
<%@ page import="java.util.Date" %>
<%@page import="org.apache.catalina.Session"%><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>registration form</title>
</head>
<body bgcolor="#FFFFF0">
<form name="f1" method ="post" action="RegisterSave" onsubmit="javascript:return validateForm();">
<p align="center">UserName: &n bsp;
<input type=text name='username' size="20"></p>
<p align="center">Password: &n bsp;
<input type="password" name ="password" size="20"></p><br>
<p align="center">ConfirmPassword:
<input type="password" name="confirmpassword" size="20"></p><br>
<p align="center">FirstName: & nbsp;
<input type ="text" name="firstname" size="20"></p><br>
<p align="center">LastName: &n bsp;
<input type ="text" name="lastname" size="20"></p><br>
<p align="center">Age: & nbsp; &nb sp;
<input type ="text" name="age" size="20"></p><br>
<p align="center">DOB: & nbsp; &nb sp;
<select name="dob">
<option>01</option>
<option>02</option>
<option>03</option>
<option>04</option>
<option>05</option>
<option>06</option>
<option>07</option>
<option>08</option>
<option>09</option>
<option>10</option>
<option>11</option>
<option>12</option>
<option>13</option>
<option>14</option>
<option>15</option>
<option>16</option>
<option>17</option>
<option>18</option>
<option>19</option>
<option>20</option>
<option>21</option>
<option>22</option>
<option>23</option>
<option>24</option>
<option>25</option>
<option>26</option>
<option>27</option>
<option>28</option>
<option>29</option>
<option>30</option>
<option>31</option>
</select>
<select name="mob">
<option>01</option>
<option>02</option>
<option>03</option>
<option>04</option>
<option>05</option>
<option>06</option>
<option>07</option>
<option>08</option>
<option>09</option>
<option>10</option>
<option>11</option>
<option>12</option>
</select>
<select name="yob">
<option>1980</option>
<option>1981</option>
<option>1982</option>
<option>1983</option>
<option>1984</option>
<option>1985</option>
<option>1986</option>
<option>1987</option>
<option>1988</option>
<option>1989</option>
<option>1990</option>
<option>1991</option>
<option>1992</option>
<option>1993</option>
<option>1994</option>
<option>1995</option>
</select></p><br>
<p align="center">Designation:   ;
<input type ="text" name="designation" size="20"></p><br>
<p align="center">TeamName: &n bsp; &nbs p;
<input type ="text" name="teamname" size="20"></p><br>
<table align="center">
<tr>
<td>Terms and Condition:</td>
<td><textarea rows="10" cols="20" name="term" >1.The registration only for SourceTrace Employee 2.Rest of the members please neglect this form.</textarea></td>
</tr>
</table>
<p align="center">
<input type="submit" name="submit" value="I Accept,Create My Account"></p>
</form>
<script type="text/javascript">
function validateForm(){
if(document.f1.username.value==""){
alert("User Name shouldnt be left blank");
document.f1.username.focus();
return false;
}
if((document.f1.password.value=="") |(document.f1.confirmpassword.value=="") ){
alert("User password shouldnt be left blank");
document.f1.password.focus();
return false;
}
if(document.f1.password.value != document.f1.confirmpassword.value){
alert("Password doesnt match");
document.f1.password.focus();
return false;
}
if(document.f1.firstname.value==""){
alert("User FirstName shouldnt be left blank");
document.f1.firstname.focus();
return false;
}
if(document.f1.lastname.value==""){
alert("User LastName shouldnt be left blank");
document.f1.lastname.focus();
return false;
}
if(document.f1.age.value==""){
alert("User Age shouldnt be left blank");
document.f1.age.focus();
return false;
}
if(document.f1.designation.value==""){
alert("User Designation shouldnt be left blank");
document.f1.designation.focus();
return false;
}
if(document.f1.teamname.value==""){
alert("User TeamName shouldnt be left blank");
document.f1.teamname.focus();
return false;
}
}
</script>
</body>
</html>
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