validation

How to validate username and password in a login screen?

View Answers

July 7, 2011 at 4:11 PM

1)login.jsp:

<html>
<head>
<script type="text/javascript">
function showData(){ 
    var user=document.getElementById("username").value;
    var pass=document.getElementById("password").value;
    xmlHttp=GetXmlHttpObject()
    var url="check.jsp";
    url=url+"?user="+user+"&&pass="+pass;
    xmlHttp.onreadystatechange=stateChanged 
    xmlHttp.open("GET",url,true)
    xmlHttp.send(null)
}
function stateChanged(){ 
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
    var showdata = xmlHttp.responseText; 
    document.getElementById("lab").innerHTML=showdata;  
    document.getElementById("lab").style.color="red";
    document.getElementById("username").value=" ";
    document.getElementById("password").value="";
    } 
}
function GetXmlHttpObject(){
var xmlHttp=null;
try{
  xmlHttp=new XMLHttpRequest();
 }
catch(e){
 try{
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch(e){
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}
</script>
</head>
<form name="form">
<table>
<tr><td>Username:</td><td><input type="text" id="username"></td></tr>
<tr><td>Password:</td><td><input type="password" id="password"></td></tr>
<tr><td></td><td><input type="button" value="Submit" onclick="showData();"></td></tr>
</table>
<label id="lab"></label>
</form>
</html>

2)check.jsp:

<%@ page import="java.sql.*" %> 
<%
String user = request.getParameter("user");
String pass = request.getParameter("pass");
String data ="";
try{
          Class.forName("com.mysql.jdbc.Driver");
          Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
          Statement st=con.createStatement();
          ResultSet rs=st.executeQuery("select * from login where username='"+user+"' and password='"+pass+"'");
          int count=0;
          while(rs.next()){
            count++;
          }
          if(count>0){
            %>
            <jsp:forward page="success.jsp"/>
            <%
          }
          else{
             data="Username or Password is Invalid!";
          }
out.println(data);
System.out.println(data);
}
catch(Exception e){
System.out.println(e);
}
%>

Ads

Advertisements

validation.....
validation..... hi.......... thanks for ur reply for validation code. but i want a very simple code in java swings where user is allowed to enter only numerical values in textbox , if he enters string values then it should

validation
Validation method valid the in put. otherwise call the javascript onsubmit to check... code.Ok if you use struts then you can use Validation method valid the in put

Validation
); JLabel label=new JLabel("JTable validation Example",JLabel.CENTER); JPanel panel=new JPanel(); panel.add(scroll); JFrame frame=new JFrame("JTable validation

validation
validation please help me to check validation for <form> <table class="form"> <tr> <td class="col1"> <label>Sno:</label> </td> <td

validation files
validation files If I place validation files in the folder where the action classes are present,will there any error arise

javascript validation
javascript validation validation of comparing dropdownlist and textbox in javascript

validation query
validation query where I should kept properties file inside struts Web application

form validation
form validation how the form validation is done in jsf form using javaScript

NSURL Validation
NSURL Validation How to validate a NSURL string using special character validation

email validation
email validation during email validation.... after domain name which it means if example [email protected] .... this address allowed by any validation program .... but i want to show invalid email address because domain name com

Validation of datepicker
Validation of datepicker I have a datepicker in my JSp...the seleted dates are put in a text box. I want the alert the user from selecting future... a future date is entered..How to do this validation in javascript or jsp

Form Validation
Form Validation Java script validation for checking special characters and white spaces and give an alert.Please help me urgent Thanks in advance

comboBox validation
comboBox validation dear sir. i want to know . how to validate radio button in struts using xml validation. thanks

Date Validation
Date Validation Hi, I need Date Validation using java in spring framework. Please Anyone help me... Thanks in advance

date validation
date validation sir, pls provide date validation code in javascript..we want to include it into our master form.. Please visit the following link: http://www.roseindia.net/mysql/datevalidation.shtml

Struts validation
Struts validation I want to put validation rules on my project.But after following all the rules I can't find the result. I have extended... validation rules,put the plugins inside strutsconfig.xml, put the html:errors tag

Validation doubt
Validation doubt hi..... thanks for the other validation code. I have got that and implemented in my code but i have a doubt in that. As we try to put string values its not allowing to do tht it gives us message its right

Server side validation vs client side validation
Server side validation vs client side validation Can any one tell me the difference between these two different ways of Validation? Also features of Server side validation vs client side validation. The client side

Struts2 validation Procedure
Struts2 validation Procedure In struts2 Which one is best XML Validation or Programatic validation? and which one is used in real world application

JavaScript Form Validation
JavaScript Form Validation JavaScript Form Validation

validation

Validation

validation

Validation

Ads