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Validation concept in Javascript


It is used to check that the entered data is correct according to format, range, and requirement.
It is also used to validate different data format using a regular expression.
When we create Login Form, a registration form or any other form then we can implement Javascript validation code which can be executed in any web browser.
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">

function validreg()
{
           var email = document.getElementById("txtemail").value;
           atpos = email.indexOf("@");
           dotpos = email.lastIndexOf(".");
           if(atpos==-1 || dotpos==-1 || dotpos-atpos<3 || atpos<1 || dotpos+1==email.length)
           {
            document.getElementById("spemail").innerHTML= "Invalid emailid";
            return false;
           }
           if(document.getElementById("txtpass").value.length==0)
           {

            document.getElementById("sppass").innerHTML= "Enter password";
            return false;
           }
            if(document.getElementById("txtcpass").value.length==0)
           {
            document.getElementById("spcpass").innerHTML= "Re-Enter password";
            return false;
           }
          if(document.getElementById("txtpass").value!=document.getElementById("txtcpass").value)
           {
            document.getElementById("sppass").innerHTML= "password mismatch";
            return false;
           }
           if(document.getElementById("txtmobile").value.length==0)
           {
            document.getElementById("spmobile").innerHTML= "mobileno is required";
            return false;
           }
           if(isNaN(document.getElementById("txtmobile").value))
           {
            document.getElementById("spmobile").innerHTML= "mobileno should be numeric";
            return false;
           }
           if(document.getElementById("txtmobile").value.length!=10)
           {
            document.getElementById("spmobile").innerHTML= "mobileno should be 10 digit";
            return false;
           }
}
</script>
</head>
<body>
<form action="Demo5.html" method="post">
<input type="text" id="txtemail" placeholder="Enter email" />
<span id="spemail"></span>
<br>
<br>
<input type="password" id="txtpass" placeholder="Enter password" />
<span id="sppass"></span>
<br>
<br>
<input type="password" id="txtcpass" placeholder="Re-Enter password" />
<span id="spcpass"></span>
<br>
<br>
<input type="text" id="txtmobile" placeholder="Enter mobileno" />
<span id="spmobile"></span>
<br>
<br>
<input type="submit" value="Register" id="btnreg" value="Register" onclick="return validreg()" />
<br>
<br>
</form>
</body>
</html>
                      
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