Registration Form Validation Example - HTML JAVASCRIPT ALERT BOX ~ ●.. My B.Tech ..● 2K8618.blogspot.com

HTML code: Demo Registration.html

<html >
<head>

       <!--external javascript-->
<script typ="text/javascript" src="validation.js" >
</script>

</head>
<body>

<center>
<h1>Demo Registration Form</h1>
<form name="form1"  method="post" action="success.html">
 
<table border='0'>
 <tr>
  <td><LABEL for="firstname">First Name:<sup style="color:#F00">*</sup> </LABEL></td>
         <td><INPUT type="text" id="firstname"></td>
 </tr>
 <tr>
  <td><LABEL for="lastname">Last Name:<sup style="color:#F00">*</sup> </LABEL></td>
  <td><INPUT type="text" id="lastname"></td>
 </tr>
     
 <tr>
   <td><LABEL for="gender">Gender:<sup style="color:#F00">*</sup> </LABEL></td> <td><INPUT type="radio" name="gender" value="Male"> Male
   <INPUT type="radio" name="gender" value="Female"> Female </td>
 </tr>
 <tr>
  <td><LABEL for="dob">Date of Birth:<sup style="color:#F00">*</sup> </LABEL></td>
  <td> 
  <select id="dd">
        <option value="dd">DD</option>
        <script type="text/javascript">
   for(var i=1;i<32;i++)
    document.write("<option value='"+i+"'>" + i+"</option> ");
   </script>
        </select>
                </select>
                 <select id="mmm">
         <option value="mmm">MMM</option>
         <option value="0">JAN</option>
         <option value="1">FEB</option>
         <option value="2">MAR </option>
         <option value="3">APR</option>
         <option value="4">MAY</option>
         <option value="5">JUN</option>
         <option value="6">JUL</option>
         <option value="7">AUG</option>
         <option value="8">SEP</option>
         <option value="9">OCT</option>
         <option value="10">NOV</option>
         <option value="11">DEC</option>
        </select>
        <select id="yyyy">
           <option value="yyyy"selected>YYYY</option>
        <script type="text/javascript">
   var dt= new Date();
   for(var i=1979;i<=dt.getFullYear();i++)
    document.write("<option value='"+i+"'>" + i+"</option> ");
  </script>
  </select>
   
  </td>
 </tr>
 <tr>
  <td><LABEL for="address" style="text-align:left;">Address:<sup style="color:#F00">*</sup> </LABEL></td>
  <td><textarea id="address"  name="address" rows="4" cols="20"></textarea>   
  </td>
  

 </tr>
 <tr>
  <td><LABEL for="contctno">Contact Number:<sup style="color:#F00">*</sup> </LABEL></td>
  <td><INPUT type="text" id="contctno"></td>
 </tr>
 <tr>
  <td><LABEL for="email">Email:<sup style="color:red;">*</sup> </LABEL></td>
  <td><INPUT type="text" id="email"></td>
 </tr>
 <tr>
  <td></td><td><br/><INPUT type="submit" onClick="return validateForm()" value="Submit">
  <INPUT type="reset" onClick="return confirmreset()"></td>
 </tr>
 
 <tr>
  <td></td><td style="font-size:12px;text-align:right;"><br/><i style="color:red;font-size:12px;align:right;" >* - Mandatory</i></td>
 </tr>
    </table>
 </FORM></center>



</body>
</html>

Javascript code: validation.js

function validateForm()
{
 
 var x=document.forms["form1"]["firstname"];
 if (x.value=="")
   {
  alert("Please enter the First name.");
  x.focus();
  return false;
   }
 
 else if(x.value.length>20)
   {
   alert("First name cannot be greater than 20 characters.");
  x.value="";
  x.focus();
  return false;
   }
 else if ((!namepattern.test(x.value)))
   {
  alert("First name should contain only alphabets.");
  x.value="";
  x.focus();
  return false;
   }

 x=document.forms["form1"]["lastname"];
 if(x.value=="")
   {
  alert("Please enter the Last name.");
  x.focus();
  return false;
 } 
  else if(x.value.length>20)
   {
  alert("Last name cannot be greater than 20 characters.");
  x.value="";
  x.focus();
  return false;
 }
 else if (!namepattern.test(x.value))
   {
    alert("Last name should contain only alphabets.");
  x.value="";
  x.focus();
  return false;
 }

 if((document.form1.gender[0].checked==false)&&(document.form1.gender[1].checked==false))
 {
  document.form1.gender[0].focus();
  alert("Please select a gender.");
  return false;
 }
 var dd=document.form1.dd.value;
 var mmm=document.form1.mmm.value;
 var yyyy=document.form1.yyyy.value;
 if(!validdate(dd,mmm,yyyy))
 {
  return false;
 }
  
 x= document.getElementById("address");
 if(x.value==null || x.value=="" )
 {
  alert("Please enter the Address.");
  x.value="";
  x.focus();
  return false;
 }
 else if(x.value.length<20)
   {
  alert("Address should be greater than 20 characters.");
  x.value="";
  x.focus();
  return false;
 }

 x=document.form1.contctno;
 if(x.value=="")
 {
  alert("Please enter the Contact number.");
  x.value="";
  x.focus();
  return false;
 }
 else if(isNaN(x.value))
 {
  alert("Contact number should contain only digits.");
  x.value="";
  x.focus();
  return false;
 }
 else if(x.value.length!=10)
 {
  alert("Contact number should contain only 10 digits.(Mobile number)");
  x.value="";
  x.focus();
  return false;
 }
 else if(!phonepattern.test(x.value))
 {
  alert("Invalid Contact number.");
  x.value="";
  x.focus();
  return false;
 }

 x=document.form1.email;
 if(!emailpattern.test(x.value))
 {
  alert("Invalid email id.");
  x.value="";
  x.focus();
  return false;
 }

 if(confirm("Do you want to submit the form?"))
{
alert("Registration Form Submitted Successfully.");
}
else
return false;

}
function validdate(dd,mm,yyyy)
 {
  var dateobj = new Date(yyyy, mm, dd);
  var datecurrent= new Date();
  if((dateobj.getMonth()!=mm)||(dateobj.getDate()!=dd)||(dateobj.getFullYear()!=yyyy)||(dateobj>datecurrent))
  {
   alert("Please select a valid date.");
   return false;
  }
  return true;
 }
 
 function confirmreset()
 {
  return confirm("Do you want to reset the form?");
 }