JavaSript/validation.html at master · Aaditrii/JavaSript · GitHub

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<html>
<head>
<title>question13</title>
</head>
<body>
<form name="f" method="post" action="abc.html" onsubmit="return(validate())">
Username<br/>
<input type="text" name="f1" value=""><br/>
password<br/>
<input type="password" name="f2" value=""><br/>
phone number<br/>
<input type="tel" name="f3" value=""><br/>
Email<br/>
<input type="text" name="f4" value=""><br/>
<input type="submit" value="ok">
</form>
<script>
function validate()
{
if(document.f.f1.value==""||document.f.f1.value.length>8)
{
alert("you entered wrong value for username");
document.f.f1.focus();
return false;
}
if(document.f.f2.value=="")
{
alert("blank password is not allowed");
document.f.f2.focus();
return false;
}
if(document.f.f3.value==" "||document.f.f3.value.length!=10)
{
alert("phone number is not valid");
document.f.f3.focus();
return false;
}
if(document.f.f4.value=="")
{
alert("field cannot be left blank");
document.f.f4.focus();
return false;
}
var em=document.f.f4.value;
var atpos=em.indexOf('@');
var dotpos=em.lastIndexOf('.');
if(atpos<1||dotpos-atpos<2)
{
alert("this is not a valid email");
document.f.f4.focus();
return false;
}
return true;
}
</script>
</body>
</html>