To create a Java Script-enabled form that checks whether a user has filled in the form correctly or not before it's sent to the server. This is called form validation.
A D V E R T I S E M E N T

What is form validation?

Form validation is the process of checking that a form has been filled in correctly or not before it is processed.

For example, if your form has a box for the user to type their email address or any user id, you might want your form handler to check that they've filled in their address before you deal with the rest of the form.

There are two methods for the form validation.

1: Client-Side validation

2: Server-side validation

1: Client-Side validation

In Java Script Client-side form validation is an important part of a web site where data needs to be collected from the user. Users are innately ignorant, and will mess up data entry in a web form if given the chance. It is the job of the web programmer, then, to make sure his pages which use forms include client-side form validation using JavaScript.

2: Server-side validation

In Java Script the server also benefits from client-side validation since it saves a number of round-trips between the visitor and the server owing to typos and easily spotted mistakes. This advantage does not alleviate the neccessity of doing server-side validation.

<html>
<head>

<script type="text/javascript">
function validateForm()
{
var username = document.form1.username.value;
var phone = document.form1.phone.value;
var passA = document.form1.passwordA.value;
var passB = document.form1.passwordB.value;
if(!validateRequired(username))
{
alert("Username required");
return false;
}
if(!isValid(phone))
{
alert("Phone must be numerical");
return false;
}
if(!bothSame(passA, passB))
{
alert("Passwords must match");
return false;
}
return true;
}

function validateRequired(username)
{
if(username==null || username=="")
{
return false;
}
return true;
}

function isValid(phone)
{
var i;
var allowed="0123456789";
for(i=0;i<phone.length;i++)
{
if(allowed.indexOf(phone.charAt(i))==-1)
{
return false;
}
}
return true;
}

function bothSame(passA, passB)
{
if(passA==passB)
{
return true;
}
return false;
}
</script>

</head>
<body>
<form name="form1" action="SumitPage.html" onSubmit="return
validateForm()" method="post">
Username: <input type="text" name="username" size="25">
Password: <input type="text" name="passwordA" size="25">
retype Password: <input type="text" name="passwordB" size="25">
Phone: <input type="text" name="phone" size="25">
<input type="submit" value="Submit">
</form>
</body>
</html>

Web browsers can disable Java Script, so it is not a good idea to base your sites security or validation entirely on Java Script.

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Keywords: javascript date validation, form validation, javascript validation user, validation routine

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Our Portals : Academic Tutorials \| Best eBooksworld \| Beyond Stats \| City Details \| Interview Questions \| Discussions World \| Excellent Mobiles \| Free Bangalore \| Give Me The Code \| Gog Logo \| Indian Free Ads \| Jobs Assist \| New Interview Questions \| One Stop FAQs \| One Stop GATE \| One Stop GRE \| One Stop IAS \| One Stop MBA \| One Stop SAP \| One Stop Testing \| Webhosting in India \| Dedicated Server in India \| Sirf Dosti \| Source Codes World \| Tasty Food \| Tech Archive \| Testing Interview Questions \| Tests World \| The Galz \| Top Masala \| Vyom \| Vyom eBooks \| Vyom International \| Vyom Links \| Vyoms \| Vyom World \| Important Websites
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JavaScript Validation

What is form validation?

1: Client-Side validation

2: Server-side validation

No eBooks on JavaScript could be found as of now.